® 5700A/5720AMulti-Function Series II Calibrator Service Manual PN 601630 June 1996 Rev. 1, 3/02 ©1996, 2002 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
LIMITED WARRANTY & LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days.
Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation.
OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals, observe all safety precautions! To avoid electrical shock hazard, the operator should not electrically contact the output hi or sense hi binding posts. During operation, lethal voltages of up to 1100V ac or dc may be present on these terminals.
Symbols Marked on Equipment DANGER — High Voltage Protective ground (earth) terminal Attention — refer to the manual. This symbol indicates that information about the usage of a feature is contained in the manual. Power Source The 5700A/5720A Series II is intended to operate from a power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground.
SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present. Use Care When Servicing With Power On Dangerous voltage exist at many points inside this product. To avoid personal injury, do not touch exposed connections and components while power is on.
FIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live Conductor Shut off high voltage at once and ground the circuit. If high voltage cannot be turned off quickly, ground the circuit. If the circuit cannot be broken or grounded, use a board, dry clothing, or other nonconductor to free the victim. Get Help! Yell for help. Call an emergency number. Request medical assistance.
Table of Contents Chapter 1 Title Page Introduction and Specifications........................................................ 1-1 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. 1-10. 1-11. 1-12. 1-13. 1-14. 1-15. 1-16. 1-17. 1-18. 1-19. 1-20. 1-21. 1-22. 1-23. 1-24. 1-25. 1-26. 1-27. 1-28. 1-29. 1-30. 1-31. 1-32. 1-33. Introduction .......................................................................................... Contacting Fluke ..................................................................
5700A/5720A Series II Service Manual 1-34. 1-35. 2 General Specifications.......................................................................... 1-36 Auxiliary Amplifier Specifications ...................................................... 1-37 Theory of Operation........................................................................... 2-1 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. 2-17. 2-18. 2-19. 2-20. 2-21. 2-22. 2-23. 2-24. 2-25. 2-26. 2-27. 2-28.
Contents (continued) 2-49. Decoding and Timing Circuitry................................................... 2-28 2-50. Control Display Circuitry ............................................................ 2-29 2-51. Output Display Circuitry ............................................................. 2-30 2-52. Keyboard Scanner Circuitry ........................................................ 2-31 2-53. Knob Encoder Circuitry............................................................... 2-31 2-54.
5700A/5720A Series II Service Manual 2-113. 2-114. 2-115. 2-116. 2-117. 2-118. 2-119. 2-120. 2-121. 2-122. 2-123. 2-124. 2-125. 2-126. 2-127. 2-128. 2-129. 2-130. 2-131. 2-132. 2-133. 2-134. 2-135. 2-136. 2-137. 2-138. 2-139. 2-140. 2-141. 2-142. 2-143. 2-144. 2-145. 2-146. 2-147. 2-148. 2-149. 2-150. 2-153. 2-154. 2-155. 2-156. 2-157. 2-158. 2-159. 2-160. 2-161. 2-162. 2-163. 2-164. 2-165. 2-166. 2-167. 2-168. ADC Amplifier ............................................................................
Contents (continued) 2-169. 2-170. 2-171. 2-172. 2-173. 2-174. 2-175. 2-176. 2-180. 2-186. 2-187. 2-199. 2-204. 2-205. 2-206. 2-207. 2-208. 2-209. 2-210. 2-211. 2-212. 2-213. 2-214. 2-215. 2-216. 2-222. 3 Ohms Main Assembly (A10) ........................................................... Selection of Resistance Values.................................................... Ohms Main Assembly Support of Current Function Calibration Ohms Digital Control .........................................................
5700A/5720A Series II Service Manual 3-27. 3-28. 3-29. 3-30. 3-31. 3-32. 3-33. 3-34. 3-35. 3-36. 3-37. 3-38. 3-39. 3-40. 4 3-38 3-39 3-40 3-41 3-42 3-42 3-43 3-43 3-45 3-45 3-45 3-46 3-46 3-48 Maintenance ....................................................................................... 4-1 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 5 Wideband AC Voltage Module Output Verification.......................
Contents (continued) 5-13. 5-14. 5-15. 5-16. 5-17. 5-18. 5-19. 5-20. 5-21. 5-22. 5-23. 6 5-58 5-63 5-67 5-68 5-69 5-72 5-74 5-76 5-77 5-79 5-82 List of Replaceable Parts .................................................................. 6-1 6-1. 6-2. 6-3. 6-4. 6-5. 7 Troubleshooting the DAC Assembly (A11) .................................... Duty-cycle Control Circuit .......................................................... ADC Circuit..................................................................
5700A/5720A Series II Service Manual viii
List of Tables Table 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. 1-10. 1-11. 1-12. 1-13. 1-14. 1-15. 1-16. 1-17. 1-18. 1-19. 1-20. 1-21. 1-22. 2-1. 2-2. 2-3. 2-4. 2-5. Title Page Auxiliary Amplifier Data.......................................................................................
5700A/5720A Series II Service Manual 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 3-21. 3-22. 3-23. 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. 3-30. 3-31. 3-32. 3-33. 3-34. 3-35. 3-36. 3-37. Front Panel Memory Map...................................................................................... Control Lines for the Keyboard LEDs......................................................
Contents (continued) 3-38. 5-1. 5-2. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 6-11. 6-12. 6-13. 6-14. 6-15. 6-16. 6-17. 6-18. 6-19. 6-20. 6-21. 6-22. 6-23. 6-24. 6-25. 6-26. 6-27. Test Record for Flatness Check of the AC 2 mV Range....................................... Verifying Multiplexer U 6..................................................................................... Ohms Main Resistance Tolerance .........................................................................
5700A/5720A Series II Service Manual xii
List of Figures Figure 1-1. 1-2. 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. 2-17. 2-18. 2-19. 2-20. 2-21. 2-22. 2-23. 2-24. 2-25. 2-26. 2-27. 2-28. 2-29. 2-30. Title Time and Costs: Calibrator Calibration................................................................. Volt-Hertz Capability ............................................................................................ Digital Section Block Diagram....................................................
5700A/5720A Series II Service Manual 2-31. 2-32. 2-33. 2-34. 2-35. 2-36. 2-37. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 4-1. 4-2. 4-3. 4-4. 4-5. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. 5-13. 5-14. 5-15. 5-16. 5-17. Ohms Main Assembly Simplified Schematic........................................................ Two-Wire Lead Drop Compensatin Circuit ..........................................................
Contents (continued) 5-18. 5-19. 5-20. 5-21. 5-22. 5-23. 5-24. 5-25. 5-26. 5-27. 5-28. 5-29. 5-30. 5-31. 5-32. 5-33. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 6-11. 6-12. 6-13. 6-14. 6-15. 6-16. 6-17. 6-18. 6-19. 6-20. 6-21. 6-22. 6-23. 6-24. 6-25. 6-26. 6-27. 6-28. Waveform at TP4, Calibrator Set to 0V ................................................................ Waveform at TP4, Calibrator Set to 6.5V ............................................................. Waveform at TP7..............
5700A/5720A Series II Service Manual xvi
Chapter 1 Introduction and Specifications Title 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. 1-10. 1-11. 1-12. 1-13. 1-14. 1-15. 1-16. 1-17. 1-18. 1-19. 1-20. 1-21. 1-22. 1-23. 1-24. 1-25. 1-26. 1-27. 1-28. 1-29. Introduction .......................................................................................... Contacting Fluke .................................................................................. About this Manual ..........................................................................
5700A/5720A Series II Calibrator Service Manual 1-30. 1-31. 1-32. 1-33. 1-34. 1-35. 1-2 Resistance Specifications ..................................................................... DC Current Specifications ................................................................... AC Current Specifications ................................................................... Wideband AC Voltage (Option 5700-03) Specifications .................... General Specifications..........................................
Introduction and Specifications Introduction 1 1-1. Introduction The Fluke Model 5700A/5720A Series II calibrators are precise instruments that calibrate a wide variety of electrical measuring instruments. These calibrators maintain high accuracy over a wide ambient temperature range, allowing them to test instruments in any environment, eliminating the restrictions to calibrate only in a temperaturecontrolled standards laboratory.
5700A/5720A Series II Calibrator Service Manual • Extensive internal self testing and diagnostics of analog and digital functions. • A traceable calibration procedure for all modes and ranges that requires only 10V, 1Ω, and 10 kΩ external standards, with only occasional independent verification.
Introduction and Specifications Additional Instruction Manuals • Using auxiliary amplifiers: Chapter 4 • Self calibration: Chapters 1 and 7 • Remote operation (IEEE-488 or serial): Chapter 5 • Options and accessories: Chapters 2 and 8 • Instrument specifications: The end of this Chapter • Theory of operation: Chapter 2 of the 5700A/5720A Series II Service Manual 1 1-5.
5700A/5720A Series II Calibrator Service Manual 1-7. Auxiliary Amplifiers The Fluke Model 5725A Amplifier is available to extend the high voltage performance and current range of the calibrator: Interface connectors on the calibrator’s rear panel accept cables to directly operate a 5725A. Three amplifiers can be connected to the calibrator at the same time, but only one output can be active at a time.
Introduction and Specifications Support Equipment and Services 1 ordering instructions for this support equipment and other Fluke instruments, refer to the Fluke catalog, or contact a representative at a Fluke Sales and Service Center. 1-10. 732B Direct Voltage Reference Standard The Fluke 732B is a rugged, easily transported solid state direct voltage reference standard with a highly predictable 10V output.
5700A/5720A Series II Calibrator Service Manual when the calibrator is returned to a standards laboratory for periodic verification. The 5700A/5720A Series II Service Manual contains the wideband flatness calibration procedure. Chapter 7 of this manual contains the wideband gain calibration procedure. 1-14. Service Centers A worldwide network of Fluke service centers supports Fluke instruments and assists customers in many ways.
Introduction and Specifications Calibrating the 5700A/5720A Series II Calibrator 1 1-16. Calibrating the 5700A/5720A Series II Calibrator The traditional practice of returning a calibrator to a standards laboratory at regular intervals for a full calibration is time consuming, expensive, and disruptive to the task to which the calibrator is being applied. Moreover, it leaves gaps in confidence.
5700A/5720A Series II Calibrator Service Manual TRADITIONAL CALIBRATOR CALIBRATION COST $ CALIBRATION CYCLE TIME 5700A/5720A SERIES II CALIBRATION COST $ CALIBRATION CYCLE TIME f1-1.eps Figure 1-1. Time and Costs: Calibrator Calibration 1-17. The Calibration Process Calibration requires only three external standards: 10V, 1Ω, and 10 kΩ. Environmentally-controlled internal check standards provide the primary reference points.
Introduction and Specifications Calibration Check • Except for the internal ac/dc transfer standard, the internal check standards are directly calibrated by traceable external standards every time the 5700A/5720A Series II is calibrated. • The internal ac/dc transfer standard is never adjusted, so its traceability is not disturbed by calibration.
5700A/5720A Series II Calibrator Service Manual • The process is consistent and automatic: it does not require an operator’s assistance. Each calibration check produces a new set of data points for accumulating a historical record. When this process is externally automated, significant history can be accumulated much faster than with a manual calibration. 1-22. Range Calibration After calibration, you can make further fine adjustments to each range.
Introduction and Specifications Specifications 1 You do not need to add anything to absolute uncertainty to determine the ratios between the calibrator’s uncertainties and the uncertainties of your calibration workload. Relative uncertainty specifications are provided for enhanced accuracy applications. These specifications apply when range constants are adjusted (see “Range Calibration”).
5700A/5720A Series II Calibrator Service Manual 1-28. DC Voltage Specifications Table 1-2. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Absolute Uncertainty ± 5 °C from calibration temperature Range Relative Uncertainty ± 1 °C For fields strengths >1 V/m but ≤3 V/m, add 0.01% of range. Resolution 24 Hours 90 Days 180 Days 1 Year ± (ppm output + µV) 24 Hours 90 Days ± (ppm output + µV) 220 mV 10 nV 0 5 + 0.5 7 + 0.5 0 8 + 0.
Introduction and Specifications DC Voltage Specifications 1 Table 1-3. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Absolute Uncertainty ± 5 °C from calibration temperature Range Resolution Relative Uncertainty ± 1 °C For fields strengths >1 V/m but ≤3 V/m, add 0.01 % of range. 24 Hours 90 Days 180 Days 1 Year ± (ppm output + µV) 24 Hours 90 Days ± (ppm output + µV) 220 mV 10 nV 6.5 + .75 7 + .75 08 + .75 09 + .8 2.5 + .
5700A/5720A Series II Calibrator Service Manual Table 1-4. DC Voltage Secondary Performance Specifications and Operating Characteristics Temperature Coefficient Adder [Note 2] Range Stability [Note 1] ± 1 °C 10 °-40 °C 24 Hours ± (ppm output + µV) Noise 0 °-10 °C and Linearity ± 1 °C 40°-50 °C ± (ppm output + µV)/°C Bandwidth 0.1-10 Hz Bandwidth 10 Hz-10 kHz pk-pk RMS ± (ppm output + µV) µV 220 mV 0.3 + 0.3 00.4 + 0.1 1.5 + 0.5 0 1 + 0.2 0.15 + 0.1 5 2.2 V 0.3 + 1 00.3 + 0.1 1.
Introduction and Specifications AC Voltage Specifications 1 1-29. AC Voltage Specifications Table 1-5. 5720A Series II AC Voltage Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Absolute Uncertainty ± 5 °C from calibration temperature Frequency 24 Hours 2.2 mV 22 mV 220 mV 2.
5700A/5720A Series II Calibrator Service Manual Table 1-6. 5720A Series II AC Voltage Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolution Absolute Uncertainty ± 5 °C from calibration temperature Frequency 24 Hours 90 Days 2.2 mV 22 mV 220 mV 2.
Introduction and Specifications AC Voltage Specifications 1 Table 1-7. 5700A Series II AC Voltage Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Absolute Uncertainty ± 5 °C from calibration temperature 24 Hours 90 Days 180 Days 1 Year ± (ppm output + µV) Relative Uncertainty ± 1 °C 24 Hours 90 Days ± (ppm output + µV) Range Resolution Frequency 2.
5700A/5720A Series II Calibrator Service Manual Table 1-8. 5700A Series II AC Voltage Specifications: 95 % Confidence Level 5700A 95% 95% Confidence Level Range Resolution Absolute Uncertainty ± 5 °C from calibration temperature Frequency 24 Hours 90 Days 2.2 mV 22 mV 220 mV 2.
Introduction and Specifications AC Voltage Specifications 1 Table 1-9. AC Voltage Secondary Performance Specifications and Operating Characteristics Range 2.
5700A/5720A Series II Calibrator Service Manual Table 1-9. AC Voltage Secondary Performance and Operating Characteristics (continued) 5725A Amplifier: Stability ±1 °C [Note 1] Range Temperature Coefficient Adder Frequency 24 Hours ±(ppm output + mV) Hz 1100 V 040 - 1 k 01 k - 20 k 20 k - 50 k 50 k - 100 k Voltage Range 10°-40 °C Maximum Current Limits 10 Hz-10 MHz [Note 2] ±(% output) ±(ppm output + mV) 010 + 1 090 + 6 275 + 11 500 + 30 150 pF 1000 pF 0.10 0.15 0.30 0.40 5 5 10 30 0.10 0.
Introduction and Specifications Resistance Specifications 1 1-30. Resistance Specifications Table 1-10. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99% Confidence Level Nominal Value Absolute Uncertainty of Characterized Value ±5 °C from calibration temperature [Note 1] 24 Hours 90 Days Ω 0 1 1.9 10 19 100 190 1k 1.9 k 10 k 19 k 100 k 190 k 1M 1.
5700A/5720A Series II Calibrator Service Manual Table 1-11. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Nominal Value Absolute Uncertainty of Characterized Value ±5 °C from calibration temperature [Note 1] 24 Hours 90 Days 50 µΩ 85 85 26 24 15 15 11 11 9 9 11 11 16 17 33 43 110 50 µΩ 95 95 28 26 17 17 12 12 11 11 13 13 18 19 37 47 120 Ω 0 1 1.9 10 19 100 190 1k 1.9 k 10 k 19 k 100 k 190 k 1M 1.
Introduction and Specifications Resistance Specifications 1 Table 1-12. Resistance Secondary Performance Specifications and Operating Characteristics Nominal Value Stability ±1 °C [Note 1] Temperature Coefficient Adder [Note 2] 10°-40 °C Ω 0°-10 °C and 40°-50 °C ±ppm/°C 24 Hours ±ppm Full Spec Load Range Maximum Peak Current Maximum Difference of Characterized to Nominal Value mA ±ppm [Note 3] Two-Wire Adder active compensation [Note 4] Lead Resistance 0.
5700A/5720A Series II Calibrator Service Manual Table 1-13. Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under Current Ω Two-Wire Comp Four-Wire Four-Wire I < IL I < IL IU < I < Imax [Note 2] [Note 1] [Note 1] SHORT 4.4 0.3 1 4.4 300 4 x10 1.9 4.4 160 1.5 x 10 10 4.4 30 1.6 x 10 -5 -4 -3 -3 19 4.4 16 3 x 10 100 4.4 3.5 1 x 10 190 4.4 2.5 1.9 x 10 1k 4.4 0.4 0.1 1.9 k 4.4 0.4 0.19 10 k 5000 50 2.0 19 k 5000 50 3.
Introduction and Specifications DC Current Specifications 1 1-31. DC Current Specifications Table 1-14. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Range Absolute Uncertainty ±5 °C from calibration temperature. Resolution Relative Uncertainty ±1 °C For fields strengths >0.4 V/m but ≤3 V/m, add 1 % of range. 24 Hours 90 Days 180 Days 1 Year 24 Hours ± (ppm output + nA) nA 90 Days ± (ppm output + nA) 220 µA 0.
5700A/5720A Series II Calibrator Service Manual Table 1-15. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Absolute Uncertainty ±5 °C from calibration temperature Range Resolution 24 Hours 90 Days 0.1 2.2 mA 1 22 mA 10 045 + 10 045 + 10 045 + 100 050 + 10 050 + 10 050 + 100 µA 220 mA 0.1 2.2 A 1 180 Days 1 Year ± (ppm output + nA) nA 220 µA Relative Uncertainty ±1 °C For fields strengths >0.4 V/m but ≤3 V/m, add 1% of range.
Introduction and Specifications DC Current Specifications 1 Table 1-16. DC Current Secondary Performance Specifications and Operating Characteristics Temperature Coefficient [Note 2] Range Stability ±1 °C [Note 1] 10 °-40 °C 24 Hours ± (ppm output + nA) 220 µA 2.2 mA 22 mA 220 mA 2.2 A 5725A 11 A 05 + 1 05 + 5 05 + 50 08 + 300 09 + 7 µA ± (ppm output + µA) 25 + 100 0 °-10 °C and Noise Burden Voltage Adder [Note 3] Compliance Limits 40 °-50 °C ± (ppm output + nA)/ °C 01 + 0.
5700A/5720A Series II Calibrator Service Manual 1-32. AC Current Specifications Table 1-17. 5720A Series II AC Current Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Absolute Uncertainty ±5 °C from calibration temperature Frequency Relative Uncertainty ±1 °C For fields strengths >0.4 V/m but ≤3 V/m, add 1 % of range. 24 Hours 90 Days 2.2 mA 22 mA 2.
Introduction and Specifications AC Current Specifications 1 Table 1-18. 5720A Series II AC Current Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolution Frequency Absolute Uncertainty ±5 °C from calibration temperature Relative Uncertainty ±1 °C For fields strengths >0.4 V/m but ≤3 V/m, add 1 % of range.
5700A/5720A Series II Calibrator Service Manual Table 1-19. 5700A Series II AC Current Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Range Resolution Absolute Uncertainty ±5 °C from calibration temperature Frequency For fields strengths >0.4 V/m but ≤3 V/m, add 1 % of range. 24 Hours 2.
Introduction and Specifications AC Current Specifications 1 Table 1-20. 5700A Series II AC Current Specifications: 95 % Confidence Level 5700A 95% 95 % Confidence Level Range Absolute Uncertainty ±5 °C from calibration temperature Resolution Frequency For fields strengths >0.4 V/m but ≤3 V/m, add 1 % of range. 24 Hours 2.2 mA 22 mA 1 nA 10 nA 100 nA 2.
5700A/5720A Series II Calibrator Service Manual Table 1-21. AC Current Secondary Performance Specifications and Operating Characteristics Stability ±1 °C [Note 1] Range 220 µA 2.2 mA 22 mA Frequency 24 Hours Hz ± (ppm output + nA) 010 - 20 020 - 40 040 - 1 k 01k - 5 k 05k - 10 k 010 - 20 020 - 40 040 - 1 k 01k - 5 k 05k - 10 k 010 - 20 020 - 40 040 - 1 k 01k - 5 k 05k - 10 k Hz 220 mA 2.
Introduction and Specifications Wideband AC Voltage (Option 5700-03) Specifications 1 1-33. Wideband AC Voltage (Option 5700-03) Specifications Table 1-22. Wideband AC Voltage (Option 5700-03) Specifications Specifications apply to the end of the cable and 50 Ω termination used for calibration Range Volts Absolute Uncertainty ±5 °C from calibration temperature 30 Hz-500 kHz Resolution dBm 24 Hours 90 Days 180 Days 1 Year ± (% output + µV) 1.1 mV 3 mV 11 mV 33 mV 110 mV 330 mV 1.1 V 3.
5700A/5720A Series II Calibrator Service Manual 1-34. General Specifications Warm-Up Time: Twice the time since last warmed up, to a maximum of 30 minutes. System installation: Rear output configuration and rack- mount kit available. Standard interfaces: IEEE-488, RS-232, 5725A, 5205A or 5215A, 5220A, phase lock in (BNC), phase reference out (BNC). Temperature performance: Operating: 0 °C to 50 °C. Calibration: 15 °C to 35 °C. Storage: -40 °C to 75 °C; DC Zeros calibration required every 30 days.
Introduction and Specifications Auxiliary Amplifier Specifications 1 1-35. Auxiliary Amplifier Specifications For complete specifications, see the 5205A and 5220A Operators Manuals. 5205A (220V - 1100 V ac, 0 V - 1100 V dc) Overshoot: < 10 % Distortion (bandwidth 10 Hz - 1 MHz): 10 Hz - 20 kHz 0.07 % 20 kHz - 50 kHz 0.2 % 50 kHz - 100 kHz 0.25 % Frequency (Hz) 90 Day Accuracy at 23° ±5 °C ± (% output + % range) Temperature Coefficient for 0°-18 °C and 28°-50 °C ± (ppm output + ppm range)/ °C 0.
5700A/5720A Series II Calibrator Service Manual 1-38
Chapter 2 Theory of Operation Title 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. 2-17. 2-18. 2-19. 2-20. 2-21. 2-22. 2-23. 2-24. 2-25. 2-26. 2-27. 2-28. 2-29. 2-30. 2-31. 2-32. 2-33. 2-34. 2-35. Introduction .......................................................................................... Calibrator Overview ............................................................................. Internal References ..................................................
5700A/5720A Series II Calibrator Service Manual 2-36. 2-37. 2-38. 2-39. 2-40. 2-41. 2-42. 2-43. 2-44. 2-45. 2-46. 2-47. 2-48. 2-49. 2-50. 2-51. 2-52. 2-53. 2-54. 2-55. 2-56. 2-57. 2-58. 2-59. 2-60. 2-61. 2-62. 2-63. 2-64. 2-65. 2-66. 2-67. 2-68. 2-69. 2-70. 2-71. 2-72. 2-73. 2-74. 2-75. 2-76. 2-77. 2-87. 2-88. 2-89. 2-90. 2-91. 2-92. 2-93. 2-94. 2-95. 2-96. 2-97. 2-2 Glue Logic ................................................................................... RAM (Random-Access Memory)...................
Theory of Operation Introduction 2-98. 2-99. 2-100. 2-101. 2-102. 2-103. 2-104. 2-105. 2-106. 2-107. 2-108. 2-109. 2-110. 2-111. 2-112. 2-113. 2-114. 2-115. 2-116. 2-117. 2-118. 2-119. 2-120. 2-121. 2-122. 2-123. 2-124. 2-125. 2-126. 2-127. 2-128. 2-129. 2-130. 2-131. 2-132. 2-133. 2-134. 2-135. 2-136. 2-137. 2-138. 2-139. 2-140. 2-141. 2-142. 2-143. 2-144. 2-145. 2-146. 2-147. 2-148. 2-149. 2-150. 2-153. 2-154. Internal CAL Zero Amplifier.......................................................
5700A/5720A Series II Calibrator Service Manual 2-155. 2-156. 2-157. 2-158. 2-159. 2-160. 2-161. 2-162. 2-163. 2-164. 2-165. 2-166. 2-167. 2-168. 2-169. 2-170. 2-171. 2-172. 2-173. 2-174. 2-175. 2-176. 2-180. 2-186. 2-187. 2-199. 2-204. 2-205. 2-206. 2-207. 2-208. 2-209. 2-210. 2-211. 2-212. 2-213. 2-214. 2-215. 2-216. 2-222. 2-4 High Voltage Assemblies (A14 and A15) ....................................... 1100V AC Range.........................................................................
Theory of Operation Introduction 2 2-1. Introduction This section provides theory of operation in increasing level of detail. The calibrator is first broadly defined in terms of digital functions (relating to the Digital Motherboard assembly) and analog functions (relating to the Analog Motherboard assembly). The interrelationship of these two areas is then explored in discussions of each output function. Finally, the overall picture is rounded out with a discussion of system interconnections.
5700A/5720A Series II Calibrator Service Manual After initial functional verification of the Fluke Thermal Sensors, their characteristics only change by less than 1/10th of the allowed ac/dc error per year. External calibration of the ac voltage function of the Calibrator consists of verifying that the Calibrator meets its specifications. 2-6. Digital-to-Analog Converter (DAC). A patented 26-bit dac is used in the calibrator as a programmable voltage divider.
Theory of Operation Analog Section Overview 2 ahp003f.eps Figure 2-1.
5700A/5720A Series II Calibrator Service Manual These analog assemblies are interfaced to the Analog Motherboard assembly (A3). The guarded digital bus generated by the guard crossing portion of the Regulator/Guard Crossing assembly controls all analog assemblies except the Filter/PA Supply. The Guard Crossing interfaces with the unguarded CPU assembly via a fiber-optic link.
Theory of Operation Theory of Operation 2 ahp33f.eps Figure 2-2.
5700/5720A Series II Calibrator Service Manual ahp34f.eps Figure 2-3.
Theory of Operation Functional Description Presented by Output Function 2 The 1100V range is generated by the High Voltage/High Current assembly (A15) operating in conjunction with the Power Amplifier assembly and the High Voltage Control assembly. The 11V range of the DAC assembly is routed to the High Voltage/High Current assembly which amplifies by a gain of -100 to create the 1100V range.
5700A/5720A Series II Calibrator Service Manual 2-12. Wideband AC V Functional Description (Option -03) The Wideband AC Voltage module (Option -03) consists of the Wideband Oscillator assembly (A6) and the Wideband Output assembly (A5). There are two wideband frequency ranges: • • 10 Hz to 1.1 MHz 1.2 MHz to 30 MHz During operation between 10 Hz and 1.
Theory of Operation System Interconnect Detailed Circuit Description 2 2-15. Ohms Functional Description Two assemblies function as one to supply the fixed values of resistance: • • Ohms Main assembly (A10) Ohms Cal assembly (A9) All of the resistance values except the 1Ω, 1.9Ω, and short are physically located on the Ohms Main assembly. The 1Ω, 1.9Ω, and short are physically located on the Ohms Cal assembly.
5700A/5720A Series II Calibrator Service Manual 2-18. Transformer Assembly (A22) The Transformer assembly receives ac line inputs routed through the A4 Digital Motherboard. This assembly supplies outputs throughout the Calibrator, all of which are routed through the A4 Digital Motherboard. The Transformer assembly, the filter portion of the Filter/PA Supply assembly (A18), and the regulator portion of the Regulator/Guard Crossing assembly (A17) create the system power supply for all analog assemblies.
Theory of Operation Functional Description Presented by 0utput Function 2 ahp35f.eps Figure 2-4.
5700/5720A Series II Calibrator Service Manual ahp35f.eps Figure 2-4.
Theory of Operation System Interconnect Detailed Circuit Description 2 Table 2-1.
5700A/5720A Series II Calibrator Service Manual 2-20. Front/Rear Binding Posts An internal cable can be configured to enable either the front panel or panel binding posts. When compared to front panel binding posts, the rear panel provides the same OUTPUT HI, OUTPUT LO, SENSE HI, SENSE LO, AND V GUARD functions. Also, the rear panel provides an I GUARD (current guard) connection for use when the Calibrator is supplying low-level ac current through a long cable.
Theory of Operation Digital Section Detailed Circuit Description 2 Table 2-2. Supplies Generated by the Digital Power Supply Signal Name +75V OUT Test Point TP2 Nominal Output 73V Tolerance +/-8% Current Limit Rated Output 121 mA 100 mA +35V OUT TP5 35V +/-7% 52 mA 40 mA +12 VOLTS TP8 12V +/-5% 1.5A 700 mA -12 VOLTS TP10 12V +/-5% 1.5A 450 mA +5V TP12 5.2V +/-5% 2.4A 2.0A COMMON TP13 2-25.
5700A/5720A Series II Calibrator Service Manual flow to the output. Diode CR16 protects this circuit from reverse voltage and C4 is a bypass capacitor. Inductor L2 filters the regulated output. Resistor R13 is a bleed-off resistor for C3. 2-28. +75V Power Supply The +75V power supply powers the grid drivers and anode drivers on the front panel control display circuitry. A full-wave rectifier made of diodes CR1-CR4 and filter capacitor C1 generate the unregulated +75V supply. Its input is fused by F1, a 0.
Theory of Operation Digital Section Detailed Circuit Description 2 2-30. CPU (Central Processing Unit) Assembly (A20) The CPU (Central Processing Unit) for the Calibrator is a single-board computer based on a 68HC000 microprocessor. The CPU assembly communicates with the Guarded Digital section, the Front Panel assembly, and the Rear Panel assembly.
5700A/5720A Series II Calibrator Service Manual ahp004f.eps Figure 2-5.
Theory of Operation Digital Section Detailed Circuit Description 2 Table 2-3.
5700A/5720A Series II Calibrator Service Manual 2-33. Watchdog Timer The watchdog timer circuitry uses a 74HC4020 binary counter (U11) to divide the 450 Hz from the clock generation circuit to produce interrupt DOGINTH, signifying that the system may be locked up. This interrupt is generated 1.14 seconds after the last DOGCLR2 signal from interrupt controller U10. Therefore, DOGCLR2 must occur more often then every 1.14 seconds to clear U11 and prevent the watchdog interrupt.
Theory of Operation Digital Section Detailed Circuit Description 2 2-35. Interrupt Controller PLD U10 is the priority interrupt controller. The interrupt controller reads incoming interrupts and interrupt control lines, then encodes the highest priority interrupt into the interrupt level for the 68HC000. When the 68HC000 responds to an interrupt request, it asks the interrupt controller for an 8-bit vector that corresponds to the pending interrupt of highest priority.
5700A/5720A Series II Calibrator Service Manual 2-39. Electrically-Erasable Programmable Read-Only Memory (EEPROM) IC U13 is an EEPROM. The socket accommodates a 32K x 8 device (32 KB of storage.) A jumper is provided to allow an 8K x 8 (8 KB) device to be used in place of the 32 KB device. The Calibrator is shipped with a 32KB EEPROM installed.
Theory of Operation Digital Section Detailed Circuit Description 2 2-42. Clock Filter Circuit The clock filter circuit generates a 3.6864 MHz 200 mV sine wave for the Rear Panel and Front Panel assemblies. This circuit buffers the 3.6864 MHz Clock with an inverter in U3. The circuit contains dc-blocking capacitor C80, two stages of a low pass LC filter (L80 and C81, L81 and C82), transformer T51, and termination resistor R82. 2-43.
5700A/5720A Series II Calibrator Service Manual 2-46. Front Panel Assembly (A2) The Front Panel assembly, operating in conjunction with the Keyboard assembly (linked by a cable), is the operator interface to the Calibrator. This assembly contains two separate vacuum-fluorescent displays: the Control Display and the Output Display. Each display has its own control, high voltage drive, and filament-switching circuits.
Theory of Operation Digital Section Detailed Circuit Description 2 Table 2-6. Front Panel Memory Map Name OTDCS* DMDCS* ENCODERCS* ENCODERRESET* LED_OUTPUT_CNTRL LED_LATCH_EN KEYBOARDCS* Read/Write R/W R/W R W R W R/W Address D02000 to D027FF D02800 to D02FFF D03000 to D033FF D03000 to D033FF D03400 to D037FF D03400 to D037FF D03800 to D03BFF 2-50.
5700A/5720A Series II Calibrator Service Manual transistors. When AOUT is high, U13B turns Q2 and Q4 on. Q4 turns Q6 on, providing a path for the filament current through Q2 and Q6. Zener diode VR2 provides the dc voltage offset necessary for proper filament operation. Then when BOUT is high, U13A turns Q1 and Q3 on. Q1 turns Q5 on, providing a path for the filament current through Q3 and Q5, effectively reversing the direction of the voltage driving the filament.
Theory of Operation Digital Section Detailed Circuit Description 2 Output display filament driver circuitry consists of transistors Q7-Q12 and zener diodes VR3 and VR4, plus associated resistors. The transistors are driven by 7406 opencollector drivers U13C and U13D. These drivers are controlled by AOUT and BOUT as in the Control Display. When AOUT is high, U13C turns Q8 and Q10 on. Q10 turns Q12 on, providing a path for the filament current through Q8 and Q12.
5700A/5720A Series II Calibrator Service Manual interrupt by reading U24. On a read, indicated by a logic low on ENCODERCS*, U24 places the contents of a seven-bit up/down counter on the data bus. The counter keeps track of the number of 180º rotations that have occurred between the time the interrupt was first initiated and the counter is read. The counter is incremented or decremented depending on the direction of rotation.
Theory of Operation Analog Section Detailed Circuit Description 2 2-56. Analog Section Detailed Circuit Description Detailed descriptions of each assembly in the analog section are provided here. Simplified schematics are provided to supplement the text. 2-57.
5700A/5720A Series II Calibrator Service Manual 2-58. Unregulated OSC Supplies Line OSC COM is the return path for the +15 OSCR and -15 OSCR supplies. These supplies use a full-wave center-tapped configuration. They consist of bridge rectifier CR3 and two filter capacitors, C4 and C6, for +15 OSCR and -15 OSCR, respectively. Inputs are fused with 1.6A slow-blow fuses F1 and F2. 2-59. Unregulated LH Supplies Line 5 LH COM is the return path for the +5 LHR and -5 LHR supplies.
Theory of Operation Analog Section Detailed Circuit Description 2 2-64. FR2 Supplies FR2 COM is the return path for unregulated +30 FR2R supply and regulated -5 FR2 supply. Each supply uses a full-wave, bridge configuration. The unregulated +30 FR2R supply consists of bridge rectifier CR7 and filter capacitor C9. Its input is fused with 0.5A slow-blow fuse F4. The -5 FR2 supply consists of bridge rectifier CR11, filter capacitor C11, regulator U1, bypass capacitor C12, and protection diode CR9.
5700A/5720A Series II Calibrator Service Manual ahp005f.eps Figure 2-6.
Theory of Operation Analog Section Detailed Circuit Description 2 2-67. ±250V and ±500V Supplies Input signals PA CT, PA HAC1, PA HAC2, PA LAC1, and PA LAC2 come from the main transformer. • PA CT is the center tap. • PA HAC1 and PA HAC2 are high voltage taps with approximately 400V rms and are fused by F201 and F204 respectively. • PA LAC1 and PA LAC2 are lower voltage taps with approximately 200V rms and are fused by F202 and F203 respectively.
5700A/5720A Series II Calibrator Service Manual Output current on the +PA side is sensed between the emitter and base of Q203 by R202 and/or R201. Supply +PA shuts off to near 0V when enough current is flowing through +PA to forward-bias Q203. Then, current though Q203 charges capacitor C209 through R214 to a voltage above the threshold voltage at the inverting input of comparator U201C. The overcurrent condition must persist for about 75 ms for C209 to charge above the threshold.
Theory of Operation Analog Section Detailed Circuit Description 2 Table 2-10. Regulated Outputs from the Regulator/Guard Crossing Assembly Signal Name Nominal Output Tolerance Current Limit Rated Output Test Point +15 OSC +15V +/-800 mV 2A 200 mA TP3 -15 OSC -15V +/-800 mV 2A 200 mA TP5 +5RLH +5.975V +/-425 mV 2A 600 mA TP14 +5LH +5.1V +/-300 mV 2A 600 mA TP11 -5LH -5V +/-300 mV 2A 400 mA TP15 +44S +44.15V +/-2.03V 0.5A 140 mA TP13 -44S -44.15V +/-2.03V 0.
5700A/5720A Series II Calibrator Service Manual The -44S supply uses the unregulated -44SR supply from the Filter assembly. This supply uses three-terminal TO-39 regulator U13, Q1, VR1, VR2, VR6, R17, R18, R19, PTC Resistor R61, CR22, CR23, CR32, CR33, C22, C25, C26, and C66. The regulator IC, U13, provides the current and thermal limiting. Its regulated output voltage is set by R17 and R18, yielding a nominal output of -44.15V.
Theory of Operation Analog Section Detailed Circuit Description 2 supply. Capacitor C12 improves ripple rejection. Diodes CR9 and CR10 protect U5 against input shorts, while CR12 protects against reverse voltage. 2-77. Guarded Digital Control Circuitry The Inguard CPU controls all the analog assemblies. It communicates with the Unguarded CPU assembly (A20) through a serial fiber-optic link.
5700A/5720A Series II Calibrator Service Manual 2-80. Inguard Clock Circuit This circuit uses 8 MHz crystal Y52 and step-down transformer T51 to generate a lowlevel (200 mV p-p) 8 MHz clock used by other guarded assemblies throughout the calibrator. Transformer (T51) has a center-tapped secondary, and provides CLK COM, CLK and CLK*. The CLK and CLK* sine-wave signals are sent to certain analog assemblies where they are converted into square wave clock signals for timing purposes. 2-81.
Theory of Operation Analog Section Detailed Circuit Description 2 2-85. Interface to Guarded Digital Bus The interface to the guarded digital bus consists of a 74HCT245 (U55), a 74HCT244 (U52), two 74HC137s (U53 and U54), inverters U51B and U51D, resistor packs Z52, Z53, and Z54, and the POP line from U58. U52A and U52B buffer various control and address lines. Resistors from Z52 pull the lines of U52A to desired inactive states when BUSEN* is at a logic high, disabling the bus.
5700A/5720A Series II Calibrator Service Manual The Switch Matrix assembly consists of 33 latching type, two- and four-pole relays. The relays are driven by special driver chips, which are controlled by the assembly’s 24output 82C55 chip. The Switch Matrix also contains the 5700A-4HR1 TemperatureControlled Precision DC Amplifier Hybrid and RNET assembly, which is used when the calibrator is in the dc 2.2V or 220 mV range.
Theory of Operation System Interconnection Detailed Circuit Description 2 ahp37f.eps Figure 2-7.
5700A/5720A Series II Calibrator Service Manual A UCN5801 driver (U13) drives non-latching relays on the motherboard. The motherboard non-latching relay supply circuit, as outlined in sections A6 through A8 of the schematic diagram, contains U17, Q1, Q2, CR1, CR2, CR10, and R6-R12. Port A of U1 provides data for this driver (PA0-PA7), and decoder U2 provides the strobe signal. Since this driver controls non-latching relays, the enable is tied to LH COM.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp006f.eps Figure 2-8.
5700A/5720A Series II Calibrator Service Manual 2-90. Switch Matrix Operation: 2.2V AC and 22V AC Ranges Refer to Figure 2-9 for the following discussion. AC 2.2V and 22V ranges are generated by the Oscillator assemblies and routed directly to the front panel binding posts through relays located on the Switch Matrix and Motherboard. Line OSC OUT is connected to INT OUT HI through relays K19A, K18B, K27, and K30. INT OUT HI is connected to the OUTPUT HI binding post through relay K1 on the motherboard.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp007f.eps Figure 2-9. Switch Matrix Configuration for 2.
5700A/5720A Series II Calibrator Service Manual ahp008f.eps Figure 2-10.
Theory of Operation Analog Section Detailed Circuit Description 2 2-92. Switch Matrix Operation: 2.2V DC Range Refer to Figure 2-11 for the following discussion. The dc 2.2V range circuit consists of the dc 2.2V attenuator and a dc 2.2V range amplifier as outlined on sheet 3 of the Switch Matrix schematic.
5700A/5720A Series II Calibrator Service Manual ahp009f.eps Figure 2-11. Switch Matrix Configuration for 2.
Theory of Operation Analog Section Detailed Circuit Description 2 2-93. Calibration of the 2.2V Range Refer to Figure 2-12 for the following discussion. Calibration of the 2.2V range involves determining its offset and gain constants. To calibrate the offset: 1. The gain of the internal cal zero amplifier is set to 130 by turning on Q6 via PB4. 2. A checkpoint reading is taken, which represents 0V at the input of the internal call zero amplifier.
5700A/5720A Series II Calibrator Service Manual ahp010f.eps Figure 2-12. Calibration of the 2.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp011f.eps Figure 2-13.
5700A/5720A Series II Calibrator Service Manual 2-95. Switch Matrix Operation: 220 mV AC Range Refer to Figure 2-14 for the following discussion. As previously mentioned, the ac 220 mV range uses the same resistor network as the dc 220 mV range. In generating the ac 220 mV range the Oscillator assembly is set to the 2.2V range. Lines OSC OUT and OSC SENSE are connected to pin 3 of the 10:1 divider by relays K5 and K6. Lines OS COM and OSC SENSE LO are connected to pin 2 by relays K11 and K9 respectively.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp012f.eps Figure 2-14. V AC, 2.
5700A/5720A Series II Calibrator Service Manual ahp013f.eps Figure 2-15.
Theory of Operation Analog Section Detailed Circuit Description 2 Calibration of the 10:1 divider ratio is accomplished by connecting the DAC assembly output (DAC OUT HI and DAC SENSE HI) through relays K24 (A and B) and K6 to the input of the 10:1 divider. DAC LO, PA COM, and R COM are connected to the common of the 10:1 divider by relays K12, K11, and K21 respectively. The DAC output is set to 2.2V to produce approximately 0.22V at the output of the 10:1 divider (AC/DC mV).
5700A/5720A Series II Calibrator Service Manual ahp014f.eps Figure 2-16.
Theory of Operation Analog Section Detailed Circuit Description 2 The internal cal zero amplifier is outlined in a broken line rectangle on sheet 1 of the schematic. Its functional parts are U20-U21, R38-44, R46-47, Q6-7, Q11, and Z2. When Q7 is on, the input of the zero amplifier is connected to 0V for a reference point. When Q6 is on, the gain of the zero amplifier is 130. Op amp U21 and its associated resistors form a current-cancellation circuit.
5700A/5720A Series II Calibrator Service Manual first input square wave is called the first channel. It is switched between the reference voltage (13V) and 0V. The filter’s second input square wave is called the second channel. It is switched between approximately 0.78 mV and 0V. Its amplitude is derived by resistively dividing the 13V reference. This second channel is used for extra resolution. The filter rejects all ac components of the waveforms above 10 Hz.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp015f.eps Figure 2-17.
5700A/5720A Series II Calibrator Service Manual 2-102. DAC Assembly Digital Control The digital control circuit is located on sheet 6 of the DAC schematic. The 82C55 Programmable Peripheral Interface IC (U31) is the heart of this circuit. This IC, which is under software control via the guarded digital bus, has three ports that provide 24 static lines. Port A (PA0-PA7) is configured as a read-only port register. It passes the adc readings from the ADC IC (U25) to the guarded digital bus.
Theory of Operation Analog Section Detailed Circuit Description 2 The reference circuit is designed such that the effects of the thin-film resistors and op amp errors are second order. Thus, accuracy is determined almost entirely by the ref amps. To further reduce the effects of ambient temperature variations, the hybrid is heated to a constant 62ºC by the heater control circuitry on sheet 1 of the DAC schematic. Temperature is sensed near the ref amps by a thermistor (RT1).
5700A/5720A Series II Calibrator Service Manual The 3V source is created from the 13V reference. The 13V reference is buffered by op amp U1B, configured as a voltage follower. The output from U1B is divided down to 3V by a 100 kΩ and 30 kΩ resistor in the HR5 assembly, creating 3V. This 3V is again buffered by op amp U11, configured as a voltage follower, to create the 3V, which is switched by FETs Q30 and Q32.
Theory of Operation Analog Section Detailed Circuit Description 2 In the 22V range, Q20 is off and Q21 is on, which switches in the 40 kΩ feedback resistors located on the HR6 assembly. Precise ratio matching of these resistors provides high accuracy in the 22V range. FET Q15 is on in the 22V range so that the output of the dc amplifier is half the output of the DAC.
5700A/5720A Series II Calibrator Service Manual 2-109. Negative Offset Circuit This circuit creates a constant offset voltage of approximately -127 mV at the filter input. Thus, for a DAC output voltage of 0V, the first channel count must be approximately 400 to offset this negative voltage. This guarantees a minimum duty cycle pulse width of approximately 50 us.
Theory of Operation Analog Section Detailed Circuit Description 2 2-112. Calibration Hardware The main components of the calibration hardware are the adc amplifier and the adc (analog to digital converter). This adc circuitry converts dc analog voltages into 22-bit binary numbers which the software interprets. 2-113. ADC Amplifier ADC amplifier circuitry is located on sheet 4 of the DAC schematic. The adc amplifier is used like a null detector.
5700A/5720A Series II Calibrator Service Manual 2-115. ADC Circuit The adc (analog-to-digital converter) is shown on sheet 5 of the DAC schematic. Most of the adc is contained on one chip (U25) which uses the Fluke-patented recirculating remainder technique. The adc has rms noise of approximately 20 µV between readings. This is reduced by a factor of 5 by averaging the readings. The adc measures input voltages between -1.8V and +1.8V. Hardware for the adc has four major sections external to adc IC U25.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp016f.eps Figure 2-18.
5700A/5720A Series II Calibrator Service Manual During the remainder store function, U29 amplifies and stores the difference between the ADC INPUT and the adc dac output on one of the remainder storage capacitors, C89 or C90. In this function, U29 is configured by the adc as a difference amplifier with a gain of 16. The output of U29 is now the difference between the input voltage and the DAC voltage, multiplied by 16. This voltage is stored on C89 or C90.
Theory of Operation Analog Section Detailed Circuit Description 2 same as the previous checkpoint. This determines the exact first and second channel counts for a 0V output. Next, the +11V and +22V range gain constants are calibrated by nulling the DAC to the external 10V source, connected to the front panel binding posts of the calibrator. This 10V source is connected to the RCL line by relays on the Switch Matrix assembly (A8). The RCL line is connected to the +INPUT of the adc amplifier.
5700A/5720A Series II Calibrator Service Manual All power supplies used by this assembly are generated by the Guard Crossing/Regulator assembly (A17) except the +5 OSC supply, which is generated by a three-terminal +5V regulator (U25) from the +15 OSC supply. The ±15 OSC supplies are buffered by L3, L4, C34 and C35 to create the ±15A supplies, and L1, L2, C86 and C87 to create the ±15B supplies. A +2.5V reference voltage is created from the +5LH supply by resistors R52 and R53.
Theory of Operation Analog Section Detailed Circuit Description 2 2-123. Averaging Converter The averaging converter contains the buffer amplifier and rectifying amplifier circuits as outlined on sheet 1 of the schematic. The buffer amplifier is a non-inverting unity gain amplifier (U3). Input to the buffer amplifier is either a 0 or 20 dB attenuator contained in Z2 as selected by K3. In the 2.2V range, SENSE HI is connected directly to the buffer amplifier with K3 in the reset position.
5700A/5720A Series II Calibrator Service Manual ahp017f.eps Figure 2-19.
Theory of Operation Analog Section Detailed Circuit Description 2 2-127. AC/DC Thermal Transfer Circuit Refer to Figure 2-20 for the following discussion. The ac/dc thermal transfer circuit achieves basic mid-band amplitude accuracy. This is done by first applying the reference voltage (VREF) to the thermal rms sensor (U14) and measuring the output. Next, the ac voltage is applied to the thermal rms sensor and the dc output is compared to the previous reading.
5700A/5720A Series II Calibrator Service Manual ahp018f.eps Figure 2-20.
Theory of Operation Analog Section Detailed Circuit Description 2 The ac/dc thermal sensor and square-root amplifier, as outlined on the schematic, contain the thermal sensor U14, op amp U15 and transistor array U17. The dc voltage from the thermal sensor is connected to U15B configured as an integrator. Comparator U22B is used to control FETs Q18 and Q20. These FETs are turned on, adding C84 and C62 to the integrator, by control lines LFCOMP* and AC*/DC both at logic low.
5700A/5720A Series II Calibrator Service Manual 2-129. AC/DC Frequency Response Characterization Characterization is accomplished by first performing an ac/dc transfer with the Oscillator Output set to a low frequency. The ac/ac thermal sensor circuit, containing the thermal sensor U16 and op amp U15D, characterizes the frequency response of the main ac/dc thermal sensor. This sensor has no active circuitry at its input, and all switching is done by relays to ensure a flat frequency response.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp019f.eps Figure 2-21.
5700A/5720A Series II Calibrator Service Manual 2-131. Oscillator Output Digital Control The digital control circuit consists of an 82C55 Programmable Peripheral Interface (U26), a 5801 Latching Relay Driver (U24), and three HC374 Octal D-Type Flip Flops (U12, U32, U33). The Programmable Peripheral Interface (U26) is under software control via the guarded digital bus and has three ports which generate 24 outputs. Port A (PA0-PA7) is a common input bus for U24, U12, U32, U33, and U28.
Theory of Operation Analog Section Detailed Circuit Description 2 frequency and the sum of the phase shifts around the loop is zero for all frequencies, we have satisfied one half of the requirement for oscillation. In summing the gain in dB around the loop it is apparent that unity gain occurs at only one frequency. This happens when the closed loop gains of the integrators are unity. This corresponds to F = 1/(2 x PI x R x C), which is the frequency of oscillation. 2-133.
5700A/5720A Series II Calibrator Service Manual that makes a positive to negative transition causes the phase detector to turn on either the positive (CR5, CR6) or the negative (CR7, CR8) charge pump, depending on which signal is first. The Charge Pump is turned off when the other signal makes its transition. Thus the signal with the highest frequency has its respective charge pump pulsed on and off while the other charge pump remains off.
Theory of Operation Analog Section Detailed Circuit Description 2 The mid stage is a common-emitter, Miller-compensated gain stage (Q5) that drives a common-base level shifter (Q13) on the Oscillator Output assembly. This stage is current limit protected by R12 and Q4. The dominant pole is set with the Miller capacitor C5 and the input stage transconductance. The mid stage is biased to 10 mA by Q6 and related components. The output stage of the amplifier is a bootstrapped complementary Darlington pair.
5700A/5720A Series II Calibrator Service Manual 2-140. Power Amplifier Digital Control Sip Assembly (A16A1) Digital control for the Power Amplifier assembly is contained on the SIP assembly (A16A1) mounted at the bottom of the Power Amplifier. This assembly configures the Power Amplifier assembly for its various modes of operation. (Also see "±PA Supplies Digital Control" in the Power Amplifier Supply theory of operation.
Theory of Operation Analog Section Detailed Circuit Description 2 2-141. PA Common Circuitry Common circuitry consists of the +PA and -PA supplies, input stage, mid stage, and the output stage. These four circuits are described under the next four headings. Power Amplifier input node, gain, and feedback are different for dc and ac operation. Power Amplifier gain is -20 in the dc function, determined by the ratio of resistor network bonded to the HR8 assembly (500 kΩ/25 kΩ).
5700A/5720A Series II Calibrator Service Manual the gate of Q2 is at ground potential. At any frequency, the potential difference between the gate of Q2 and the base of Q6 results in a current through Q6 as determined by R22, and by the transconductance of Q2 and Q6. The input stage is called a transconductance stage because an input voltage results in a current output at the collector of Q6.
Theory of Operation Analog Section Detailed Circuit Description 2 2-146. PA Sense Current Cancellation Circuitry During dc operation of the Power Amplifier, sense current in the 500 kΩ feedback resistor (on the resistor network in the HR8 assembly) can cause an output error because of the finite resistance path of the connection to the load. Op amp U1 eliminates this error by feeding an equal and opposite current in this path.
5700A/5720A Series II Calibrator Service Manual ahp020f.eps Figure 2-22.
Theory of Operation Analog Section Detailed Circuit Description 2 2-149. PA Operation: 220V AC Range During ac operation, Power Amplifier gain is -10 as determined by the 4.99 kΩ input resistor R17, and 49.9 kΩ feedback resistors (R11 + R12 + R13). Control line SW3 turns Q50 on, which references the +input of the precision op amp in the input stage to OS COM. The Oscillator assembly (A13) is set to the 22V range and its output OSC OUT HI is connected to the input resistor R17 by relay K10A.
5700A/5720A Series II Calibrator Service Manual is configured the same as for 220V ac operation, except that the input is the square-wave signal HVCL from the High Voltage Control assembly, rather than OSC OUT HI, through relays K13B and K10A. 2-153. 220V DC Internal Calibration Network The 220V dc internal calibration network determines the exact gains and offsets of the power amplifier.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp021f.eps Figure 2-23.
5700A/5720A Series II Calibrator Service Manual Power Amplifier dc gain of approximately -20 is calibrated next. The Power Amplifier is configured as in the 220V dc operation, except the input is connected to the DAC’s 6.5V reference BRF6 and BSRF6 by U2C and U2D respectively. The resulting -130V at the Power Amplifier output is connected to the 175 kΩ end of the internal cal resistor network by relay K3. The 25 kΩ end of this network is connected to DAC OUT HI and DAC SENSE HI by relay K1.
Theory of Operation Analog Section Detailed Circuit Description 2 f2-24.eps Figure 2-24.
5700A/5720A Series II Calibrator Service Manual 2-155. High Voltage Assemblies (A14 and A15) The High Voltage/High Current assembly (A15) and the High Voltage Control assembly (A14) are used in with conjunction with other assemblies in the calibrator to generate the ±1100V dc, 1100V ac, and the 2.2A ranges. The two assemblies work together in generating these ranges. This theory of operation explains how these ranges are generated and discusses the individual circuits on each assembly.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp022f.eps Figure 2-25.
5700A/5720A Series II Calibrator Service Manual 2-157. 1100V DC Range Refer to Figure 2-26 for the following discussion. The High Voltage assembly (A15) amplifies the output of the DAC assembly (A11), set to the 11V range, by a gain of -100 to generate the 1100V dc range. For operation in the 1100V dc range, DAC OUT HI and DAC SENSE HI from the DAC assembly, set to the 11V range, are tied together and connected to the input of the dc HV amplifier circuit by relay K1.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp023f.eps Figure 2-26.
5700A/5720A Series II Calibrator Service Manual When the DAC assembly is set to the +11V range, the output from the High Voltage assembly (with a gain of -100) is in the -1100V range. In this mode, -SP C is connected to the collector of transistor Q3. The output from the dc HV amplifier follows a change in the output voltage from the DAC assembly. This change controls how much Q3 is turned on or off. As the DAC voltage is increased, Q3 turns on pulling -SP C to PACOM.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp024f.eps Figure 2-27. High Voltage/High Current Assembly 2.
5700A/5720A Series II Calibrator Service Manual Resistor network Z5 and hybrid H4 determine the performance of the 2.2A range. Current from the A7 assembly develops a voltage across the 57W portion of Z5. The 2.2A current amplifier circuit forces the same voltage across the 0.57W portion of Z5. Because the ratio of these resistors is 100, the current through 0.57W resistor is 100 times that coming from the Current assembly (A7). Relay K12 connects this 2.
Theory of Operation Analog Section Detailed Circuit Description 2 VI+ supplies the output current when sourcing while VI- sinks it. To minimize power dissipation, the magnitude of the VI± supplies is controlled to minimize the emitter to collector voltage on the output stage transistors (Q11, Q14). This is done by controlling the magnitude of the HVCL signal. The controlling function is described later in the Magnitude Control theory. 2-163.
5700A/5720A Series II Calibrator Service Manual 2-164. High Voltage Calibration Refer to Figure 2-28 for the following discussion. The resistor network, (70 kΩ and 7 MΩ) which is part of the HR7 hybrid/resistor network assembly, determines the accuracy of both 1100V ac and dc ranges. Calibration involves determining its offset and gain constants. To determine the offset, DAC outputs are connected to 70 kΩ input resistor by K1.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp025f.eps Figure 2-28.
5700A/5720A Series II Calibrator Service Manual 2-166. Calibration of the Current Function. Refer to Figure 2-29 for the following discussion. The resistor network Z5 determines the accuracy of the 2.2A current range. Calibration involves determining its offset and gain constants. The Calibrator is configured as in the 2.2A dc function, except that the Current assembly (A7) is set to the 2.2 mA range.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp026f.eps Figure 2-29. High Voltage/High Current Assembly 2.
5700A/5720A Series II Calibrator Service Manual The signal/polarity selection circuit generates the ERROR SIGNAL used by the error amplifier. It contains op amp U2C, CMOS analog switch U6, and resistor R35-R39. Control line V/I controls U6B and U6C which select the VI± when in the current mode. Control lines ±* and ± control U6A and U6D respectively. These switches, operating in conjunction with U6B and U6C, select between VI±, -SP C or +SP C.
Theory of Operation Analog Section Detailed Circuit Description 2 These assemblies are also used to calibrate the Calibrator Current function. The Ohms Main assembly contains all the resistor values except the 1Ω, 1.9Ω, and short, which are located on the Ohms Cal assembly. It also contains the relays and their drivers to switch these values as requested under program control. The Ohms Cal assembly contains all calibration circuits except for one op amp on the Ohms Main assembly.
5700/5720A Series II Calibrator Service Manual ahp38f.eps Figure 2-30.
2 Theory of Operation Analog Selection Detailed Circuit Description ahp39f.eps Figure 2-31.
5700A/5720A Series II Calibrator Service Manual 2-171. Ohms Main Assembly Support of Current Function Calibration To calibrate the current function, the Current assembly routes output current to the Ohms Main assembly, where it is connected through a resistance. Current is determined by measuring the voltage across this resistance. During calibration, half of K38 connects n DAC OUT LO to the SENSE LO side of the 1x10 string (Z1 pin 6).
Theory of Operation Analog Section Detailed Circuit Description 2 Lines PC0-PC3 of port C go to decoder U13 and to the Ohms Main assembly. Decoder U13 enables two latch/driver ICs at a time. Setting the enable true (0V) causes the relay coils to be driven on or off depending on the contents of the latch portion of the selected ICs. Since these are latching relays, they are pulsed only briefly. The outputs PB4, PB5 and PB6 of U11 are connected to the gates of FETs Q2, Q3 and Q4 respectively.
5700A/5720A Series II Calibrator Service Manual ahp027f.eps Figure 2-32.
Theory of Operation Analog Section Detailed Circuit Description 2 2-177. Two-Wire Compensation Power Supplies The floating supplies for U7 and U8 consist of a dc-to-dc converter made up of U6, T1 and associated components. Switching-regulator control IC U6 switches +17S through the primary of T1 at about 30 kHz as determined by R27 and C21. The switching creates high-frequency spikes on the +17S line which are filtered out by L2, R25, C18, C19, C20, and C52.
5700A/5720A Series II Calibrator Service Manual ahp028f.eps Figure 2-33.
Theory of Operation Analog Section Detailed Circuit Description 2 2-181. Calibrating to the External 10 KW Standard Refer to Figure 2-33 for the following discussion. The first step in ohms calibration is to compare the 10 kΩ standard against the 10 kΩ value on the Ohms Cal assembly. This is done by passing a current through both values and measuring the voltage drop across each. The ratio of the voltages is equal to the ratio of the resistances.
5700A/5720A Series II Calibrator Service Manual OHMS SENSE HI is connected to INT SENSE HI by K16 and K2 on the Ohms Main assembly. INT SENSE HI is connected to the SENSE HI binding post by relay K2 on the motherboard which is the sense high side of the 10 kΩ external standard. The ratio of this third reading to the difference of the first two readings is proportional to the ratio of the two resistances.
Theory of Operation Analog Section Detailed Circuit Description 2 The 10Ω, 19Ω, 100Ω and 190Ω resistance values are determined using 2V from the 2/5/10V source and using internal 10:1 divider (Z5) in conjunction with the DAC. To get 2V, Q2 and Q3 are both turned on, which parallels both the 11.535 kΩ value and the 3.846 kΩ value with the 50 kΩ value. The lower voltage is required to lower the power dissipation in the resistors. Using 2V presents a problem for the DAC.
5700A/5720A Series II Calibrator Service Manual ahp029f.eps Figure 2-34.
Theory of Operation Analog Section Detailed Circuit Description 2 2-185. Calibrating to the External 1W Standard The 1Ω and 1.9Ω resistor values are calibrated by comparing them against a 1Ω external standard. The technique used is different from that used for the 10 kΩ external standard. The Current assembly supplies a 130 mA (65 mA for 1.9Ω calibration) current through both resistors. This current goes out the OUTPUT HI binding post to the 1Ω standard.
5700A/5720A Series II Calibrator Service Manual Relay driver U11 controls the three non-latching relays K14, K15, and K17 on this assembly. It also generates control line RLY11* to control K11 on the Motherboard. Relay K11 routes I-GUARD, described later, to the rear panel for operation when the rear-panel binding posts are in use. The diagnostic circuit allows the calibrator to monitor five points on the assembly. Points DUMMY LOAD, OVEN TEMP, and CUR/COMP MONITOR are from the Current section.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp030f.eps Figure 2-35.
5700A/5720A Series II Calibrator Service Manual The input signal return paths are selected for ac or dc operation by control lines FET1 and FET2, and NMOSFETs Q20-Q23. With a dc or 13V reference input, control line FET1 goes high, turning on Q21 and Q22, connecting RCOM and DAC OUT LO to the respective circuit. For ac current input, control line FET2 goes high, turning on Q20 and Q23, connecting OSC SENSE LO and OSCOM to the respective circuit. 2-189.
Theory of Operation Analog Section Detailed Circuit Description 2 Table 2-15. Relay Settings for Current Range Selection Range Relay 220 µA 2.2 mA 22 mA 220 mA K6 R R S S S R S R K7 R S R R K8 R R S R K9 R R R S K5 S=SET R=RESET 2-192. Feedback Loop The output current develops a 2.2V full-scale voltage across the appropriate shunt resistors. Buffer amplifiers U2 and U3 isolate the shunt from the remaining feedback circuit.
5700A/5720A Series II Calibrator Service Manual Internal calibration of the 2.2A range and gain of the High Voltage/High Current assembly is discussed further in the theory for the High Voltage assemblies. 2-195. Current Guard Buffer Buffer amplifier U4, configured as a voltage follower, is used to provide a guard voltage equal to the output voltage across the external load.
Theory of Operation Analog Section Detailed Circuit Description 2 ahp031f.eps Figure 2-36.
5700A/5720A Series II Calibrator Service Manual amplifier is connected to RCL, which is routed to the adc circuit on the DAC assembly. The adc circuit measures the voltage, which is the drop across the 100Ω resistor with no current applied through it. This value is the checkpoint reading and is stored in memory. The output of the Current assembly is reconnected to the 100Ω resistor.
Theory of Operation Analog Section Detailed Circuit Description 2 990 Hz and five digits resolution from 1000.0 Hz to 1.1999 kHz. The resolution break points are similar for the other ranges. 2-200. Reference Frequency Amp/Divider A 2-MHz reference frequency is generated by the reference frequency amp/divider circuit as outlined on the schematic. This circuit uses the 8 MHz system clock lines CLK and CLK*, generated by the Guard Crossing assembly (A17).
5700A/5720A Series II Calibrator Service Manual Supply voltage is applied to vco U19 whenever the Hi-Res function is used by the circuitry containing analog CMOS switch U18A, transistor Q15, and zener diode VR3. VCO U19 is energized when control line HI-RES ON/OFF goes low to close U18A, which turns on transistor Q15, connecting zener diode VR3 to the -17LH power supply.
Theory of Operation Analog Section Detailed Circuit Description 2 2-205. Rear Panel Power Supplies Power supplies are divided into guarded and unguarded. Unguarded supplies +5V LOGIC, +12V, and -12V are referenced to +5V LOGIC COMMON and are generated on the Digital Power Supply assembly (A19). Guarded supplies +5LH and -5LH are referenced to LH COM, and the supply +5RLH is referenced to RLH COM. These supplies are generated on the Regulator/Guard Crossing assembly (A17).
5700A/5720A Series II Calibrator Service Manual 2-207. Clock Regeneration Circuit In order to minimize EMI (electro-magnetic interference) inside the Calibrator chassis, the rear panel accepts a low-level (~200 mV p-p sinewave) 3.68 MHz clock from the CPU assembly and conditions it to proper TTL clock levels. This is done by a differential amplifier, U18, which amplifies the incoming signals 3.6864MHZCLK and 3.6864MHZCLK*. The output of U18 is a TTL level 3.68 MHz clock called RP3.
Theory of Operation Analog Section Detailed Circuit Description 2 5220EN* is the output enable for octal latch U10. 5220ADIR* is the output enable for buffer U11. 5205EN* is the output enable for octal latch U9. 2-210. Auxiliary Amplifier Interface A 5725A amplifier can be physically connected to the 5700A/5720A Series II. Only one can be used at a time. Depending on the amplifier’s mode of operation, the output of the Calibrator is either an ac or a dc voltage. 2-211.
5700A/5720A Series II Calibrator Service Manual Oscillator Output assembly theory of operation for a detailed description on the generation of P SHIFT. Resistor R18 serves as overcurrent protection for the BNC shell connection on J5. 2-213. Rear Panel Relay Control The relays on the Rear Panel assembly are used as the interfaces for the 5725A amplifier, or for switching the PHASE LOCK IN and VARIABLE PHASE OUT signals.
Theory of Operation Analog Section Detailed Circuit Description • • • 2 Seven control lines which comprise the CONTROL BUS A low-level 3.6864 MHz clock (CLOCK, CLOCK*) Eight data lines RPD0-RPD7 Interfacing between the Rear Panel data bus (D100-D107) and the CPU data bus (RPD0RPD7) is done with a bus transceiver U1. 2-215. Wideband AC Module (Option -03) The Option -03 Wideband AC Module consists of the Wideband Oscillator assembly (A6) and the Wideband Output assembly (A5).
5700A/5720A Series II Calibrator Service Manual In this circuit, WB MUXA, WB MUXB, and WB MUXC are decoded by U8 to generate four control lines, These are inverted and level-shifted by comparators in U10 and U11. The output of these comparators create 16-32 MHz FILTER, 8-16 MHz FILTER, 4-8 MHz FILTER, 2-4 MHz FILTER, 1-2 MHz FILTER, and Q8/Q9 SELECT, which are used in the filter switch drive circuitry. Control line WB FBS is inverted and level-shifted by a comparator in U10.
Theory of Operation Analog Section Detailed Circuit Description 2 The vco frequency is controlled by varactor diodes, CR1 + CR2, which get their bias voltage from amplifier U2. Amplifier U2, which gets its input from the phase detector outputs (0V and 0R) of U1, changes the bias on varactor diodes CR1 and CR2 until the divided vco frequency has the same frequency and phase as the 50 kHz reference frequency at the input to the phase detector in U1.
5700A/5720A Series II Calibrator Service Manual and C112. FET Q105 is turned on, in the same manner as FET Q101, to connect the sine wave output of this filter to FILTER OUTPUT. This is applied to output driver transistor Q7. To obtain the required amount of filtering over the entire octave range, additional capacitors C110 and C111 are switched into the filter by PIN diodes CR102 and CR103 when operating below 70% of the full range (22 MHz in this case).
Theory of Operation Analog Section Detailed Circuit Description 2 ahp032f.eps Figure 2-37.
5700A/5720A Series II Calibrator Service Manual 2. The second range is for operation at frequencies between 12 kHz and 1.1 MHz. In this mode the input signal is also from the Oscillator Output assembly, but the amplitude is controlled by the amplitude control circuit on the Wideband Output assembly. Relay K10 is in the set position to connect the output of the rms sensor and amplitude control circuit to the RCL line where it is measured by the adc circuit on the DAC assembly.
Theory of Operation Analog Section Detailed Circuit Description 2 2-224. Wideband Output Attenuators The 10 Hz to 30 MHz sine wave signal output of the power amplifier circuit connects to the 50Ω output attenuator composed of attenuator networks Z1 and Z2 and relays K4, K5, K6, K7, and K8. Relay K4 switches the 10 dB attenuator into the circuit when activated or bypasses it when not activated. Relay K5 switches the 20 dB attenuator into the circuit when activated or bypasses it when not activated.
5700A/5720A Series II Calibrator Service Manual sensor from damage by shunting its input and output to ground through the 200Ω resistors R2 and R18. The negative voltage at the output of U4A also turns off transistor Q1 and causes control line U9 ENABLE to go high. This disables relay driver U9, which turns off all attenuator relays (K4-K7) and output relay K8. 2-227.
Theory of Operation Analog Section Detailed Circuit Description 2 connector is connected back to the OUTPUT HI SENSE and OUTPUT LO SENSE binding posts. Attenuation is calibrated starting with 70 dB and decreased in 10 dB steps to 0 dB. The Switch Matrix assembly connects the output of the Wideband AC module to its internal cal zero amplifier circuit during all attenuator calibrations except the 0 dB and 10 dB.
5700A/5720A Series II Calibrator Service Manual 2-144
Chapter 3 Calibration and Verification Title 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 3-21. 3-22. 3-23. 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. Introduction .......................................................................................... Accessing the Fuse ............................................................................... Cleaning the Air Filter.........................................................................
5700A/5720A Series II Calibrator Service Manual 3-30. 3-31. 3-32. 3-33. 3-34. 3-35. 3-36. 3-37. 3-38. 3-39. 3-40. 3-2 Wideband Flatness Calibration Procedure....................................... Optional Tests ...................................................................................... DC Voltage Load Regulation Test................................................... DC Voltage Linearity Test...............................................................
Calibration and Verification Introduction 3 3-1. Introduction This chapter gives procedures for 5700A/5720A Series II calibration, verification, acceptance testing, and performance testing. Information here applies to testing the performance of and calibrating a normally operating 5700A/5720A Series II. In case of malfunction, refer to Chapter 5, Troubleshooting, which explains how to use self diagnostic tests to identify a faulty module.
5700A/5720A Series II Calibrator Service Manual 3-2. Accessing the Fuse The fuse is accessible from the rear panel. The fuse rating label to the right of the fuse holder shows the correct replacement fuse ratings for each operating voltage. To access the fuse, refer to Figure 3-1 and proceed as follows: 1. Disconnect line power. 2. Using a standard screwdriver, turn the fuse holder counterclockwise until the cap and fuse are disengaged.
Calibration and Verification Cleaning the Air Filter 3 3-3. Cleaning the Air Filter Caution Damage caused by overheating may occur if the area around the fan is restricted, the intake air is too warm, or the air filter becomes clogged. The air filter must be removed and cleaned at least every 30 days, or more frequently if the calibrator is operated in a dusty environment. The air filter is accessible from the rear panel of the calibrator.
5700A/5720A Series II Calibrator Service Manual 3-4. Cleaning the Exterior To keep the calibrator looking like new, clean the case, front panel keys, and lens using a soft cloth slightly dampened with either water or a non-abrasive mild cleaning solution that is not harmful to plastics. Caution Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. They can damage the plastic materials used in the calibrator. 3-5.
Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3-7. 3 Calibration Requirements Both the calibrator and the recommended external standards have the ability to internally control (or compensate for) ambient temperature variations. Therefore it is unnecessary to keep the calibrator in tightly controlled temperatures during calibration.
5700A/5720A Series II Calibrator Service Manual 3-9. Calibration Procedure Before you being this procedure make sure the calibrator is powered on and has completed the appropriate warm-up period. After you have finished calibration, but before you save the new constants, the calibrator presents the new changes as ± ppm, and as a percentage of specifications for each range and function.
Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 4. Enter the ambient temperature; then press E. The display shows: PREV MENU IF3-4.EPS 5. Connect the 732B to the calibrator as shown in Figure 3-3. VOLTAGE REFERENCE STANDARD 732B DC STANDARD CALIBRATOR AC PWR 10V 10V COM SERIAL NUMBER IN CAL CHARGE 1.018V 1.018V COM LOW BAT OUTPUT VΩA CHASSIS SENSE VΩ WIDEBAND HI HI LO LO GUARD HI AUX GUARD CURRENT GROUND F7-3.EPS Figure 3-3.
5700A/5720A Series II Calibrator Service Manual 6. Enter the true value of the 732B 10V output. The true value is the value printed on the calibration sticker, plus or minus, as well as drift that has occurred since calibration. That drift can be estimated provided control charts have been maintained for the 732B. If the entered value is not between 9V and 11V, and error message appears, which lets you start over from this point with a calibrated 732B.
Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 8. Reverse the HI and LO connections at the 732B terminals, and press E. The following displays appear, asking you to wait before proceeding with the 10 kΩ standard. PREV MENU IF3-8.EPS After a few seconds, the following display appears: PREV MENU IF3-9.EPS 9. Connect the calibrator to the 10 kΩ standard as shown in Figure 3-4 and enter the true value of the standard.
5700A/5720A Series II Calibrator Service Manual CALIBRATOR RESISTANCE STANDARD CURRENT OUTPUT VΩA SENSE HI HI LO LO SENSE VΩ WIDEBAND HI HI LO LO HI CHASSIS GROUND AUX GUARD GROUND CURRENT F7-4.EPS Figure 3-4. 742A-1 and 742A-10k External Calibration Connections 10. To reject the changes, return to the calibration menu shown in step 2 by pressing P.
Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 11. Disconnect the 10 kΩ standard, and connect the calibrator to the 1Ω standard; then enter the true value of the 1Ω standard. If the standard is not between 0.9Ω and 1.1Ω, an error message appears, which lets you start over from this point with another standard. Press E to bring up the following display: PREV MENU IF3-13.
5700A/5720A Series II Calibrator Service Manual 3-10. Range Calibration Once calibration is complete, you may find you need to make further adjustments to the range. Calibrating the range is accomplished by adjusting a range constant, which is an additional gain multiplier. Although range calibration is not needed in order to meet total uncertainty specifications, it is useful for tuning the calibrator so that its values are closer to your own standards.
Calibration and Verification Range Calibration 3 PREV MENU IF3-2.EPS 3. Press the “Range Adjust” softkey to bring up the next menu shown below: PREV MENU IF3-18.EPS 4. Press the “DC V” softkey to bring up the next menu shown below: PREV MENU IF3-19.EPS 5. Press the “NEXT Menu” softkey, which scrolls through all the available dc voltage ranges, until 220V appears. Then press that selection’s softkey to open a display similar to the following: PREV MENU IF3-20.EPS 6.
5700A/5720A Series II Calibrator Service Manual PREV MENU IF057.EPS 8. Press O to activate the calibrator output. Then turn the output adjustment knob on the calibrator until you achieve a null on the null detector. 9. Se the rear panel CALIBRATION switch to ENABLE. Press E on the front panel. The calibrator will now calculate a new range constant multiplier for the 220V dc range, and will store it in non-volatile memory. 10. The range calibration is now complete.
Calibration and Verification Calibrating the Wideband AC Module (Option 5700A-03) 3 NULL DETECTOR HI LO GUARD GND : OFF EX SNS EX GRD : OFF CALIBRATOR NC OUTPUT SENSE VΩA VA WIDEBAND HI HI LO LO HI AUX GUARD GROUND CURRENT 752A VOLTAGE DIVIDER STANDARD INPUT NULL DETECTOR REFERENCE STANDARD HI LO HI LO HI LO OUTPUT HI GND GRD LO 732B VOLTAGE REFERENCE STANDARD 732B DC STANDARD AC PWR IN CAL CHARGE LOW BAT 10V 1.018V CHASSIS 10V COM 1.
5700A/5720A Series II Calibrator Service Manual Since frequency flatness is determined by stable parameters (i.e. circuit geometry and dielectric constants), the flatness of the Wideband AC Module has excellent long-term stability. Consequently, a two-year calibration cycle is adequate for flatness calibration, and can be scheduled to coincide with the calibrator’s shipment to a standards laboratory for periodic verification. The following procedure describes how to perform the wideband gain calibration.
Calibration and Verification Calibrating the Wideband AC Module (Option 5700A-03) 3 CALIBRATOR OUTPUT VΩA SENSE VΩ 50 Ω FEEDTHROUGH WIDEBAND HI HI LO LO HI AUX CURRENT GUARD GROUND GND TAB F7-5.EPS Figure 3-6. Wideband Module Calibration Connection 4. Press the “Gain” softkey to bring up the following display: PREV MENU 5. Enter the ambient temperature; the press E. The display shows the following: IF3-3.EPS PREV MENU IF3-15.
5700A/5720A Series II Calibrator Service Manual 6. Reverse the dual-banana connector so that the center connector is connected to LO; then press E. The display shows the following: PREV MENU IF3-16.EPS After a short time, a message appears indicating that the wideband calibration is complete. 7. To store the new constants, set the CALIBRATION switch to ENABLE and press “Store Values.” To discard the constants, press “DONE with Cal” and answer “YES” when the display asks for verification. 8.
Calibration and Verification Performing a Calibration Check 3 PREV MENU IF3-3.EPS 3. Enter the ambient temperature; then press E. As the calibration check proceeds, the display indicates the current process of the calibration check. When the check is complete, the largest shift that is detected appears on the display. PREV MENU IF3-17.EPS 4. You can now print a list of the proposed shifts, or quit without creating a list.
5700A/5720A Series II Calibrator Service Manual 3-13. Full Verification An independent external verification is recommended every two years, following normal periodic calibration or repair of the calibrator. Verification establishes and maintains parallel external traceability paths for the internal functions that are not adjusted or corrected during calibration. An example is the internal ac/dc transfer standard. Verification also serves as a check that internal calibration processes are in control.
Calibration and Verification Full Verification 3 In Figure 3-7, the location of each test is identified by the paragraph numbers. 3-14. Required Equipment for All Tests An abbreviated summary of required equipment for all the verification and optional tests is given in Table 3-2. Individual lists of required equipment are included at the beginning of each test. For substitution information, refer to Table 3-15, Minimum Use Requirements, located near the end of this section. 3-15.
5700A/5720A Series II Calibrator Service Manual Table 3-2.
Calibration and Verification Full Verification 3 3-16. Resistance Verification Test The following test requires testing at the high, low and intermediate values only. This is because the 5700A/5720A Series II creates the other values of resistance from these values. Use Tables 3-16 (5720A) and 3-17 (5700A) for test records. For the convenience of anyone wishing to test the intermediate values, the tolerance limits are included.
5700A/5720A Series II Calibrator Service Manual DMM CURRENT SOURCE OUTPUT INPUT SENSE HI HI LO LO 742A-X CURRENT SENSE OUTPUT CALIBRATOR (UUT) SENSE HI HI HI HI HI LO LO LO LO LO F3-5.EPS Figure 3-8. 1 Ohm and 10 Ohm Resistor Verification Note There is no need to do the cal current calculation of step 6 if the current source has a settability of ±3 ppm. 12. Repeat steps 3 through 11 for the 1.9Ω and 10Ω resistance values using the 1.9Ω and 10Ω resistance standards.
Calibration and Verification Full Verification 3 Table 3-4. Low Value Resistance Calibration Using a Current Source 5720A (UUT) Resistance Apply Current 5720A Deviation From Displayed Value (90-day) 5720A Displayed Value 1Ω 100 mA ±95 ppm 0.9995 to 1.0005 1.9Ω 100 mA ±95 ppm 1.89905 to 1.90095 10Ω 10 mA ±25.0 ppm 9.997 to 10.003 5700A (UUT) Resistance Apply Current 5700A Deviation From Displayed Value (90-day) 5700A Displayed Value 1Ω 100 mA ±95 ppm 0.9995 to 1.0005 1.
5700A/5720A Series II Calibrator Service Manual 3-18. DC Voltage Verification Test The following test checks every dc voltage range by testing the output accuracy at decade values of voltage from 100 mV to 1000V. Use Table 3-18 (5720A) or Table 3-19 (5700) for the test record. Table 3-5 lists equipment required for this test as well as the Linearity Test that follows. See Table 3-15, Minimum Use Requirements, for equipment substitution information. Table 3-5.
Calibration and Verification Full Verification 3 3-19. DC Voltage One-Tenth Scale Linearity Test Note If the result of the previous test at 1V on the 11V range was less than 2.5 µV it is not necessary to perform this test. This test uses the same equipment as the previous test. Proceed as follows to perform the DC Voltage One-Tenth Scale Linearity Test: 1. Set the reference divider range to 10V.
5700A/5720A Series II Calibrator Service Manual 3-20. Direct Current Accuracy Verification Test Equipment required for the Direct Current Accuracy Verification Test is listed in Table 3-6. Proceed as follows to test accuracy of the dc current function: Table 3-6. Equipment Required for Direct Current Test Equipment Model DC DMM, 6-1/2 digit Wavetek 1281 or HP 3458A High-Current Shunt Fluke Y5020 (for 5725A only) Resistance Standards L&N 4221B (0.
Calibration and Verification Full Verification 3 5. Algebraically add column B to column A. Enter the result on the test record. Verify that it is within the test limits shown. 6. Repeat steps 2 through 5 using the Fluke 742A Resistance Standards and Calibrator output currents shown in Tables 3-25 or 3-26. 7. If the Calibrator is attached to a 5725A Amplifier, connect the Y5020 high-current shunt to the 5725A output terminals. Connect the dc DMM to the Y5020 highcurrent shunt voltage output connector. 8.
5700A/5720A Series II Calibrator Service Manual Use Table 3-23 (5720A) or Table 3-24 (5700A) for the test records. 1. Place the 5790A on top of the Calibrator and connect the equipment as shown in Figure 3-11. Note The point of measurement is at the end of the cable and adapter that connects to the 5790A. Other cable lengths and adapters will yield different results at high frequencies. 2. On the 5790A push UTIL MENUS button and then the MEAS CONTROL softkey.
Calibration and Verification Full Verification 3 Table 3-8. 5790A Adjustment Counts 5700A/5720A Series II Output Level 5790A Display 5790A Adjustment Counts* 2 mV 20 mV 200 mV 2V 2.3V 20V 200V 300V 600V 1000V 2.0000 20.0000 200.0000 2.000000 2.30000 20.00000 200.0000 300.000 600.000 1000.000 ±1 ±1 ±4 ±4 ±1 ±4 ±4 ±1 ±2 ±2 *Adjustment counts of 3 times the listed value is allowed at 1 MHz 3-23.
5700A/5720A Series II Calibrator Service Manual 1. Connect the equipment as shown in Figure 3-12(A) use the 2A shunt. 2. Enter the ac to dc difference corrections for each shunt at each frequency in the appropriate column of the test record (Table 3-26 or 3-27). 3. Set the Calibrator for a +2A dc output. Adjust the output so that the error display is equal to the UUT actual error for a +2A output, as shown on the dc current test record in Table 3-20 (5720A) or Table 3-21 (5700A). 4.
Calibration and Verification Full Verification 3 Note When verifying the 5725A Amplifier at the 10A level, allow sufficient time for the A40A-10 shunt to reach thermal stability after initially applying the current. A40 Current Shunt Red 5790A Calibrator (UUT) Pomona Cable 1368-A-18 Hi Input 1 Lo 792A-7004 A40 Current Shunt Adapter Black A.
5700A/5720A Series II Calibrator Service Manual 3-24. AC Current Test, 2 mA and 200 µA Ranges The equipment required for the alternating current accuracy verification test for the 2 mA and 200 µA ranges is listed in Table 3-10. Use Table 3-28 (5720A) or 3-29 (5700A0 for the test record. Table 3-10.
Calibration and Verification Full Verification 3 9. Change the Calibrator frequency to 20 Hz, 40 Hz, 1 kHz, 5 kHz and 10 kHz. At each frequency record the error display on the 5790A in Table 3-28 or 3-29. Verify that the results are within limits shown. 10. Repeat steps 2 through 9, but replace the 200Ω metal film resistor with the 2 kΩ resistor, and use 200 µA instead of 2 mA. 3-25.
5700A/5720A Series II Calibrator Service Manual Note The input impedance at INPUT 2 of the 5790A on the millivolt ranges is 10 MΩ shunted by 83 pF and the cable used to connect the shunt resistor to the 5790A has 40 pF capacitance, for a total of 123 pF. The reactance of 123 pF at 10 kHz is 129 kΩ, and using formula (1), in the case where R=2 kΩ, the network impedance Z = 1.999760 kΩ. This produces an error of 120 PPM. The allowable error at 10 kHz is reduced to account for this error.
Calibration and Verification Wideband Output Accuracy at 1 kHz Test 3 Table 3-11. Equipment Required for Testing and Calibrating the Wideband Option Equipment Model or Description AC Measurement Standard Fluke 5790A with Wideband Option -03 Wideband cable Supplied with 5700A-03 50Ω Termination Supplied with 5700A-03 Adapter Pomona 1269 BNC(F) to dual banana plug. Adapter Kings KN-99-46 N(F) to BNC(M) 3-28.
5700A/5720A Series II Calibrator Service Manual Table 3-12. Wideband Adjustment Tolerance 5700A/5720A Series II Wideband Output 5790A Adjustment Counts ± ppm 2.10000V 1.00000V 300.000 mV 100.000 mV 30.0000 mV 10.0000 mV 3.00000 mV 1000.00 µV 20 10 3 10 3 1 1 1 3-29. Wideband Output Flatness Test Use Table 3-32 as a test record. To perform wideband output flatness test, proceed as follows: 1. Connect the equipment as shown in Figure 3-17.
Calibration and Verification Wideband Output Flatness Test 3 3-30. Wideband Flatness Calibration Procedure This procedure is the only part of full verification that stores calibration constants in the Calibrator. This is not a verification test, it is a calibration procedure.
5700A/5720A Series II Calibrator Service Manual 21. Push the CLEAR REF WBND soft key on the 5790A. The 5790A wideband output changes to 10 mV at 1 kHz. 22. Push the SET REF soft key on the 5790A when the 5790A settles to a reading. This is the 10 mV reference value from which all other frequencies will be compared. 23. Repeat steps 7 and 8 above for each frequency through 30 MHz. Only the 10 MHz, 20 MHz and 30 MHz points are adjusted. 24.
Calibration and Verification Optional Tests 3 3. Repeat load regulation testing at the remaining Calibrator outputs shown in Table 3-47. 4. Set the Calibrator to standby and disconnect all equipment from the Calibrator. 3-33. DC Voltage Linearity Test Use Table 3-35 for a test record. Proceed as follows to test the dc voltage linearity: 1. Self calibrate the Kelvin-Varley (KV) divider as called for in its service manual. 2. Connect the equipment as shown in Figure 3-18.
5700A/5720A Series II Calibrator CALIBRATOR (UUT) SENSE OUTPUT Service Manual OSCILLOSCOPE MAINFRAME* TRUE RMS VOLTMETER 7A22 PLUG-IN HI VERTICAL LO GRD OUTPUT COAX GND SHIELDED TWISTED PAIR CLIP LEADS 3' APPROX BNC GR BANANA PLUGS SHIELDED TWISTED PAIR CABLE DETAIL * OSCILLOSCOPE AND AC DIFFERENTIAL VOLTMETER SHOULD BE ISOLATED FROM THE POWER LINE GROUND. F3-15.EPS Figure 3-19. DC Voltage Output Noise Test Setup 2. Set the Oscilloscope Differential Amplifier controls as shown below.
Calibration and Verification Optional Tests 3 3-35. DC Voltage Output Noise (0.1 to 10 Hz) Test Proceed as follows to test for dc voltage output noise in the range 0.1 to 10 Hz: 1. Place the 8520A DMM into Math Program 8 with the Display Option Register set to register 8.3 (Standard Deviation Computed Variable)as follows: a. Press SHIFT, 8, and PROGRAM SELECTION. Then press SHIFT, 0, ., 1, PROGRAM SELECTION, 8, ., 3, PROGRAM DATA. b. Set the DMM to 200 mV DC Range, 20 Samples/Second, and 1000 ms Filter.
5700A/5720A Series II Calibrator Service Manual Note If the spectrum analyzer input impedance is 50Ω, do not use a separate termination. 2. With 0 dBm output programmed from the Calibrator wideband output, select frequencies over the band of 1 MHz to 30 MHz and verify that use the spectrum analyzer to verify that any harmonics are below -40 dBm for fundamentals up to 10 MHz and below -34 dBm for fundamentals of 10 MHz and above. 3. Disconnect the equipment from the Calibrator. 3-38.
Calibration and Verification Minimum Use Requirements 3 Table 3-15. Minimum Use Requirements Item No. Description Minimum Use Specifications Recommended Equipment Calibration Equipment 1. Voltage Reference 10V nominal, true value certified to within ±1.5 ppm Fluke 732B 2. Resistance Standards 1Ω nominal, true value certified to within 10 ppm, 10 kΩ nominal, true value certified to within 4 ppm Fluke 742A Series, 1Ω and 10 kΩ 3.
5700A/5720A Series II Calibrator Service Manual Table 3-15. Minimum Use Requirements (cont) Item No. 9. Current Shunt Adapter Used in conjunction with 5790A and A40series shunts to facilitate AC Current measurements 10. Frequency Counter 10 Hz to 30 MHz ±0.002% Philips PM 6669 11. Standard Resistors (1) 0.1Ω nominal, true value certified to within 20 ppm, rated for 2A DC; 1Ω nominal, true value certified to within 6 ppm; 1.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Example 1 shows you how to calculate a specification limit for a specific test level from a specification listed as a percentage (or parts per million) of reading plus a floor error in microvolts, millivolts, miroamps, or nanoamps. The 99% confidence specification for a 5720A at 2 mA, 1 kHz is 130 ppm + 40 nA.
Table 3-16. 5720A Resistance Test Record 1Ω Std Res Value 1.9Ω Std Res Value 1Ω Std Voltage 1.9Ω Std Voltage Measured 1Ω Std Voltage Measured 1.9Ω Std Voltage Cal Current Cal Current UUT 1Ω Displayed Value UUT 1.9Ω Displayed Value UUT 1Ω Voltage UUT 1.9Ω Voltage UUT True Res UUT True Res UUT Dev. Uncert Std Spec (±ppm) TUR GB Factor Test Limit (±ppm) Max Difference of Charactized to Nominal Value 5.9 95 16.06 1.000 95 0.9995 to 1.0005 UUT Dev. Spec (±ppm) 5.
Table 3-16. 5720A Resistance Test Record (cont) Std Res Value DMM Std Res Rdg DMM Error DMM UUT Res Value UUT True Res Value UUT Dev. Uncert Std Spec (ppm) 10 MΩ) 12.0 19 MΩ 21.9 1.9 MΩ (1) 100 MΩ (2) TUR GB Factor Test Limit (±ppm) 37 3.07 0.982 36.3 9.997M to 10.003M 47 2.15 0.942 44.3 18.9943M to 19.0057M 19 Max Difference of Characterized to Nominal Value 1.89962M to 1.90038M 110 99.95M to 100.
Table 3-17. 5700A Resistance Test Record 1Ω Std Res Value 1Ω Std Voltage Measured 1Ω Std Voltage Cal Current UUT 1Ω Displayed Value UUT 1Ω Voltage UUT True Res UUT Dev. Uncert Std Spec (ppm) 5.9 1.9Ω Std Res Value 1.9Ω Std Voltage Measured 1.9Ω Std Voltage Cal Current UUT 1.9Ω Displayed Value UUT 1.9Ω Voltage UUT True Res 95 Spec (ppm) UUT Dev. 5.
Table 3-17. 5700A Resistance Test Record (cont) Std Res Value DMM Std Res Rdg DMM Error DMM UUT Res Value UUT True Res Value UUT Dev. Uncert. std Spec (±ppm) 10 MΩ 12.0 19 MΩ) 21.9 100 MΩ (2) GB Factor Test Limit (±ppm) ±37 3.07 0.982 36.3 9.997M to 10.003M ±47 2.15 0.942 44.3 18.9943M to 19.0057M ±19 1.9 MΩ (1) Max Difference of Characterized to Nominal Value TUR ±110 1.89962M to 1.90038M 99.95M to 100.
5700A/5720A Series II Calibrator Service Manual Table 3-18. DC Voltage Test Record for 5720A 5720A Output (1) Null Detector Reading(µV) (2) Divider Setting 5720A Range 0.1V 0.22V 0.1V ±1.20 (2) NA 1V 2.2V 1V ±4.8 µV (2) 0.55 1V 11V 1V (3) ±6 (2) 2.2 10V 11V 10V (4) ±33 3.5 10V 22V 10V (3) ±35 5.5 100V 220V 100V ±45 7.5 1000V 1100V 1000V ±65 4.5 0.1V 0.22V -0.1V ±1.20 (2) NA 1V 2.2V -1V ±4.8 (2) 0.55 10V 11V -10V ±6.0 (2) 2.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-19. DC Voltage Test Record for 5700A 5700A Output (1) Null Detector Reading(µV) (2) Divider Setting 5700A Range 0.1V 0.22V 0.1V ±1.45 (2) NA 1V 2.2V 1V ±7.2 (2) 0.55 1V 11V 1V (3) ±9 (2) 2.2 10V 11V 10V (4) ±54 3.5 10V 22V 10V (3) ±58 5.5 100V 220V 100V ±70 7.5 1000V 1100V 1000V ±86 4.5 0.1V 0.22V -0.1V ±1.45 (2) NA 1V 2.2V -1V ±7.2 (2) 0.55 10V 11V -10V ±9.
5700A/5720A Series II Calibrator Service Manual Table 3-20. Direct Current Accuracy Test Record (5720A) Characterizing dc DMM @ ±200 mV and ±2.0V 3-56 Column A Std Res Correction (ppm) Column B UUT Error Reading (ppm) Std Res Value DC DMM Setting +2A 0.1Ω (200 mV) 118 -2A 0.1Ω (200 mV) 118 +200 mA 1.0Ω (200 mV) 57 -200 mA 1.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-21. Direct Current Accuracy Test Record (5700A) Characterizing dc DMM @ ±200 mV and ±2.0V Output Current Std Res Value DC DMM Setting Rdg Column A Std Res Correction (ppm) Column B UUT Error Reading (ppm) UUT Actual Error (A+B) (ppm) Test Limit, 90-day (ppm) +2A 0.1Ω (200 mV) 135 -2A 0.1Ω (200 mV) 135 +200 mA 1.0Ω (200 mV) 73 -200 mA 1.
5700A/5720A Series II Calibrator Service Manual Table 3-23. 5720A AC Voltage Output Test Record 3-58 Output Level Frequency 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 2V 2V 2V 2V 2V 2V 2V 2V 2V 2V 2.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-23. 5720A AC Voltage Test Record (cont) Output Level Frequency Error Display Reading Spec (± ppm ) 5790A 1-Year Spec (± ppm) 31 31 69 98 31 68 200 41 130 500 38 38 38 38 130 38 TUR GB Factor Test Limit (4) (± ppm) 200V 1 kHz 64 2.05 0.936 59 200V 20 kHz 64 2.05 0.936 59 200V 50 kHz 101 1.46 0.875 88 200V 100 kHz 185 1.89 0.923 171 200V(2) 40 Hz 64 2.05 0.936 59 200V 20 Hz 110 1.62 0.
5700A/5720A Series II Calibrator Service Manual Table 3-24. 5700A AC Voltage Output Test Record Output Level Frequency 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 2 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 20 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 200 mV 2V 2V 2V 2V 2V 2V 2V 2V 2V 2V 2.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-24. 5700A AC Voltage Output Test Record (cont) Output Level Frequency Error Display Reading Spec (± ppm ) 5790A 1-Year Spec (± ppm) TUR GB Factor Test Limit (4) (± ppm) 200V 1 kHz 85 31 2.74 0.971 83 200V 20 kHz 85 31 2.74 0.971 83 200V 50 kHz 240 69 3.48 0.991 238 200V 100 kHz 600 98 6.12 1.00 200V(2) 40 Hz 85 31 2.74 0.972 83 200V 20 Hz 185 68 2.72 0.970 179 200V 10 Hz 600 200 3.00 0.
5700A/5720A Series II Calibrator Service Manual Table 3-26.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-27.
5700A/5720A Series II Calibrator Service Manual Table 3-28. 5720A AC Current 2 mA and 200 µA Accuracy Test Record Output Current Frequency Error Spec. ± ppm (90-day) 5790A Transfer Spec ± ppm TUR GB Factor Test Limits ± ppm 2 mA 2 mA 2 mA 2 mA 2 mA 2 mA 10 Hz 20 Hz 40 Hz 1 kHz 5 kHz 10 kHz 305 200 150 150 285 1500 210 73 27 27 27 27 1.45 2.74 5.56 5.56 10.56 55.56 0.874 0.971 1.000 1.000 1.000 1.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-30. Wideband Frequency Accuracy Test Record Frequency ( Hz ) Frequency Measured Tolerance Limits 10 Hz 99.99 ms to 100.01 ms 100 Hz 9.999 ms to 10.001 ms 300 Hz 299.97 Hz to 300.03 Hz 500 Hz 499.95 Hz to 500.05 Hz 800 Hz 799.92 Hz to 800.08 Hz 900 Hz 899.91 Hz to 900.09 Hz 1 kHz 999.0 Hz to 1.0001 kHz 1.19 kHz 1.189881 kHz to 1.190119 kHz 2.2 MHz 2.19978 MHz to 2.20022 MHz 3.5 MHz 3.
5700A/5720A Series II Calibrator Service Manual Table 3-31. Wideband Accuracy at 1 kHz Test Record Output Level Measured Error 2.1V 1.0V 0.3V 0.1V 30 mV 10 mV 3 mV 1 mV Spec ± ppm (90-day) 5790A 1-Year Spec ± ppm TUR GB Factor 2238 2900 2833 3400 3333 3900 4833 5400 24 24 38 53 115 240 643 1720 93 121 74.5 64.1 29.0 16.2 7.5 3.14 1.000 1.000 1.000 1.000 1.000 1.000 1.000 0.980 Test Limit 2238 2900 2833 3400 3333 3900 4833 5292 Table 3-32.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-32.
5700A/5720A Series II Calibrator Service Manual Table 3-33. Wideband Absolute Error 10 Hz to 500 kHz Flatness Error ppm Error Sum ppm 90-Day Spec Limit (±ppm) Frequency 2.
Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 Table 3-34. Load Regulation Test Record Div. Setting 5700A/5720A Series II Range 5700A/5720A Series II Out/Full Load Change In Null Measured Change In Null Limit 10V 11V 10V/199Ω ±3.1 µV 100V 220V 100V/1999Ω ±42 µV 1000V 1100V 1000V/49.99 kΩ ±310 µV Table 3-35. DC Voltage Linearity Test Record Kelvin-Varley Setting 5700A/5720A Series II Output Null Detector Reading Null Detector Reading limit 0.
5700A/5720A Series II Calibrator Service Manual Table 3-37. AC V Distortion Test Summary 5700A/5720A Series II Output 2V Load Resistors 100Ω, 1/8W 20V 1 kΩ, 1/2W 200V 10 kΩ, 5W Frequency Measured Distortion Max. Distortion 10 Hz, 20 Hz 0.054% 1 kHz, 20 kHz, 50 kHz, 0.044% 100 kHz, 200 kHz, 500 kHz 0.355% 10 Hz, 20 Hz 0.0535% 20 kHz, 100 kHz 0.0385% 200 kHz, 500 kHz 0.304% 10 Hz, 20 Hz 0.055% 50 kHz, 100 kHz 0.1065% 300V(1) 15 kΩ, 5W 40 Hz 0.1% 300V(1) 15 kΩ, 5W 50 kHz 0.
static awareness A Message From Fluke Corporation Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Leaning the guidelines for handling them. 3. Using the procedures, packaging, and bench techniques that are recommended. The following practices should be followed to minimize damage to S.S. (static sensitive) devices. 1.
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT. 8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES. 6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE. 9. HANDLE S.S. DEVICES ONLY AT A STATIC-FREE WORK STATION. 10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED. 11. ONLY GROUNDED-TIP SOLDERING IRONS SHOULD BE USED. 7.
Chapter 4 Maintenance Title 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. Introduction .......................................................................................... Cleaning the Air Filter.......................................................................... General Cleaning.................................................................................. Cleaning PCA’s....................................
5700A/5720A Series II Calibrator Service Manual 4-2
Maintenance Introduction 4 4-1. Introduction This section covers procedures that do not fall into the category of troubleshooting or repair. This includes access procedures, installation of the Wideband module (Option 03), periodic cleaning, and other special service procedures. 4-2. Cleaning the Air Filter CAUTION Damage caused by overheating may occur if the area around the fan is restricted, the intake air is too warm, or the air filter becomes clogged.
5700A/5720A Series II Calibrator Service Manual 4-3. General Cleaning To keep the Calibrator looking like new, clean the case, front panel keys, and lens using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics. CAUTION Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. They can damage the plastic materials used in the calibrator. 4-4. Cleaning PCA’s Printed circuit assemblies only need cleaning after repair work.
Maintenance Access Procedures 4 REMOVE Figure 4-2. Rear Panel Removal 4-10. Rear Panel Assembly Access Refer to Figure 4-3 during the following procedure: REMOVE 1 1 1 1 REMOVE 1 REMOVE FACK SCREWS TO SEPARATE THE REAR PANEL CIRCUIT BOARD FROM THE METAL HOUSING. F4-3.EPS Figure 4-3. Rear Panel Assembly Access 1. Remove the six securing screws for the Rear Panel assembly housing. 2. Gently pull the rear panel housing from the Rear Panel. 3.
5700A/5720A Series II Calibrator Service Manual 5. Remove P11 from J11. Then remove the two paddle board mounting screws and separate the paddle board from the Rear Panel assembly. 6. Remove the jack screws for each connection on the rear panel housing, then gently lift the Rear Panel assembly out from the housing. 7. Reverse this procedure to install the Rear Panel assembly. 4-11. Front Panel Removal and Installation Refer to Figure 4-4 during the following procedure: F4-4.EPS Figure 4-4.
Maintenance Access Procedures 4 4-13. Keyboard Assembly Removal and Installation The following procedure assumes that the Display Assembly Removal procedure has already been completed. 1. Remove all output cable connections (including GROUND-to-metal) from the front panel binding posts. Save all removed hardware. 2. Remove the two hex screws at the front of each handle. Then remove the front handles. 3.
5700A/5720A Series II Calibrator Service Manual IEEE RS232 A21 REAR PANEL PCA VOLTAGE SELECT SWITCHES A18 FILTER/PA SUPPLY PCA A17 REGULATOR/GUARD CROSSING PCA CAPTIVE SCREWS A15 HIGH VOLTAGE/HIGH CURRENT PCA (COMPONENTS FACE REAR) A14 HIGH VOLTAGE CONTROL PCA A13 OSCILLATOR OUTPUT PCA A12 OSCILLATOR CONTROL PCA A22 POWER TRANSFORMER A16 POWER AMPLIFIER PCA A10 OHMS MAIN PCA (COMPONENTS FACE REAR) A9 OHMS CAL PCA (COMPONENTS FACE REAR) A7 CURRENT/HIGH-RESOLUTION OSCILLATOR PCA A8 SWITCH MATR
Maintenance Front/Rear Binding Post Reconfiguration 4 4-15. Digital Assembly Removal and Installation Remove the CPU Assembly or the Digital Power Supply Assembly by pulling straight up at the top corners of the assembly. In relation to the chassis side, the CPU Assembly components face toward, and the Digital Power Supply Assembly components face away. See Figure 4-5. 4-16. Power Transformer Removal and Installation Use the following procedure to remove the Power Transformer assembly: 1.
5700A/5720A Series II Calibrator Service Manual Reverse this procedure when changing from rear to front output operation. 1. Remove instrument top and bottom covers and remove bottom analog guard cover. 2. Remove the instrument front panel by removing the three hex screws on each front handle side and a single screw on the top of the front panel. See Figure 4-4 for screw locations. By grasping the handles gently pull the front panel away from the frame and lay it on its handles in front of the instrument.
Maintenance Installing a Wideband AC Module (Option -03) 4 4-19. Installing a Wideband AC Module (Option -03) CAUTION The Wideband option circuit board assemblies contain staticsensitive components. Use caution to avoid static discharge when handling the modules. The procedure that follows can be used to install a 5700A-03 Wideband AC Voltage module in a Calibrator. The option consists of two circuit board assemblies. This procedure is to be done only at Service Centers. 1.
5700A/5720A Series II Calibrator Service Manual 2. Follow the access procedures to remove the digital side cover. 3. Remove the CPU Assembly (A20). 4. Desolder and remove battery BT1. 5. Solder a replacement battery in place (refer to the parts list for replacement information if necessary.) 6. Replace the CPU Assembly. After replacing the battery, the setting of the time and date the elapsed time counter (read by the remote query ETIME? and set by ETIME) will need to be reprogrammed. 4-22.
Maintenance Using Remote Commands Reserved for Servicing 4 FATALITY? Description: Returns the list of the fatal faults logged since the list was last cleared by the FATALCLR command. (Sequential command.
5700A/5720A Series II Calibrator Service Manual 4-14
Chapter 5 Troubleshooting Title 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-11. 5-12. 5-13. 5-14. 5-15. 5-16. 5-17. 5-18. 5-19. 5-20. 5-21. 5-22. 5-23. Introduction .......................................................................................... Interpreting Diagnostic Fault Codes..................................................... Component-level Troubleshooting....................................................... Troubleshooting the Wideband Output Assembly (A5) ..................
5700A/5720A Series II Calibrator Service Manual 5-2
Troubleshooting Introduction 5 5-1. Introduction Information in this section begins with guidance in using self-diagnostics fault codes to isolate a faulty module. The descriptive text helps to quickly locate the source of a fault. Further on, under Component Level Troubleshooting, techniques for isolating faulty components or circuits are described.
5700A/5720A Series II Calibrator Service Manual 2704 Spare This fault code is not used. 2705 A7: Oven Regulation Fault The heater voltage of the current hybrid is measured by dividing OVEN TEMP down and connecting it to the SDL line where it is measured by the adc circuit on the DAC assembly to ensure the hybrid is warmed up and regulating. OVEN TEMP should be 0.7V ±10% ±0.2V. A failure indicates the Current/Hi Res assembly (A7) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 2713 A7: Hi-Res Loop In 100Hz Range The instrument is set for 2.0V at 100 Hz operation. The input voltage to the VCO circuit is resistively divided to create the control line HI-RES LOOP. HI-RES LOOP is connected to the SDL line where it is measured by the adc circuit on the the DAC assembly. A failure indicates the Current/Hi Res assembly (A7) is probably at fault. 2714 A7: Hi-res Loop In 1kHz Range The instrument is set for 2.0V at 900 Hz operation.
5700A/5720A Series II Calibrator Service Manual 2801 A11: 8255 Port a Wires The diagnostics software writes and reads data to port A of the 8255 IC on the DAC assembly. A failure indicates the DAC assembly (A11) is probably at fault. 2802 A11: 8255 Port B Data Bus The diagnostics software reads port B of the 8255 IC on the DAC assembly. A failure indicates the DAC assembly (A11) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 2808 A11: ADC Amp Gain Error The DAC is set to 0.1V on the 11V range and connected to the +input of the DACs adc amplifier circuit and the -input is connected to common. The adc amplifier has a nominal gain of 11 resulting in 1.1V at the adc amplifier output. This gain is checked to be 11 ±5%. A failure indicates the DAC assembly (A11) is probably at fault. 2809 A11: DAC Monitoring Fault The DAC is set to 1.
5700A/5720A Series II Calibrator Service Manual 2815 A11: 6.5V Reference Fault The DAC’s 6.5V reference (REF6) is connected to the -input of the adc circuit and the DAC output (DAC SENSE CAL) is connected to the +input. The 6.5V reference is measure by adjusting the DAC until a null is achieved. This fault occurs if the 6.5V reference is over 10% of the nominal. A failure indicates the DAC assembly (A11) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 2822 A8/A11: -11/22V DC Zero Estimate Fault The DAC is in either the -11V or -22V range. Its output (DAC SENSE CAL) is connected to the +input of the adc circuit and the -input is connected to RCOM. The zero is estimated by adjusting the DAC until a null is achieved. This fault occurs when the nulling process does not converge. A failure indicates the DAC (A11) assembly is probably at fault.
5700A/5720A Series II Calibrator Service Manual 3103 A14: 8255 Port C Fault The diagnostics software reads port C of the 8255 IC on the High Voltage Control assembly. A failure indicates the High Voltage Control assembly (A14) is probably at fault. 3104 A15: HV Oven Regulation Fault The heater voltage of the High Voltage/High Current assembly HR7 hybrid is divided by 11 and is measured by the adc circuit. The heater voltage should be 0.7V ±10% ±0.2V.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3109 A15: HV +DC Preamplifier Fault The instrument is set to the dc 1100V range with the amplitude set to 220V, 600V, and 1100V. The output of the DC HV AMPLIFIER/AC SENSE BUFFER circuit of the High Voltage/High Current assembly is measured for 0.55V ±0.2V.
5700A/5720A Series II Calibrator Service Manual line for measurement by the adc circuit on the DAC assembly. This failure occurs if the expected output voltage is not within 12% of the nominal. 3116 A15: HV -DC Reference/error Amp Fault The instrument is set to the dc 1100V range with the amplitude set to -220V, -600V, and -1100V. The control signal AMPLITUDE from the Magnitude Control circuitry of the High Voltage Control assembly is measured. The nominal gain from AMPLITUDE to HV OUT is 135.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3122 A14/A15: HV AC 1kHz, Preamp (Lo) The instrument is configured to the ac 1100V range with on amplitude of 220V at 1 kHz. The output of the DC HV AMPLIFIER/AC SENSE BUFFER circuit of the High Voltage/High Current assembly is measured for 0.0V ±0.2V.
5700A/5720A Series II Calibrator Service Manual 3128 A14/A15: HV AC 1kHz, Output (Lo) The instrument is configured to the ac 1100V range with on amplitude of 220V at 1 kHz. The high voltage output is divided and converted to a dc voltage by the OUTPUT PEAK MEASURE circuit to create MUX5. This dc voltage is equal to the positive peaks of the ac amplitude. MUX5 is connected to the SDL line for measurement by the adc circuit on the DAC assembly. The high voltage output is measured for 220V ±12%.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3134 Spare This fault code is not used. 3135 Assembly A14 Not Responding At power up the instrument checks to see what assemblies are not installed. This test verifies that the High Voltage Control assembly is not responding. A failure indicates the High Voltage Control assembly is probably at fault. 3136 A14: 8255 Was Reset The control word for the 8255 on the High Voltage Control assembly is read.
5700A/5720A Series II Calibrator Service Manual 3140 A14/A15/A16: 2.2A AC Range Abs. Value The instrument is configured to the ac 2.2A range and set for an output current of 0.22A at 1 kHz, 0.6A at 1 kHz, 1.1A at 1 kHz, 0.6A at 40 Hz, and 1.1A at 50 Hz. The output current from the High Voltage/High Current assembly is routed to the Current assembly where it is connected to the 1.2Ω load resistor.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3303 A9: 8255 Port C Fault The diagnostics software reads port C of the 8255 IC on the Ohms Cal assembly (A9) during the instruments dormant state. A failure indicates the Ohms Cal assembly (A9) is probably at fault. 3304 A9: 10V Source Fault The 2/5/10V SOURCE circuit on the Ohms Cal assembly (A9) is set for 10V and routed to the adc circuit on the DAC assembly, via the SDL line, where it is measured for 10V ±7%.
5700A/5720A Series II Calibrator Service Manual 10 mV. A failure indicates the Differential Amplifier circuit on the Ohms Cal assembly (A9) is probably at fault. 3309 A9: Diff Amp Gain Fault The gain (nominal gain of 75) Differential Amplifier circuits on the Ohms Cal assembly (A) is checked. The DAC output is set to 86.7 mV and connected to the -input of the Diff Amp circuit with the +input connected to RCOM.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3315 A9/A10: 10 Ohm Cal Diag Fault The 2/5/10V SOURCE circuit is set for 2V and connected across the 100Ω string on the Ohms Main assembly. The resulting 0.2 V across the 10Ω portion is connected to the input of the Differential Amplifier on the Ohms Cal assembly. The output of the DAC assembly is set to 2V and connected across the 100 kΩ resistance in Z5 on the Ohms Cal assembly. The resulting 0.
5700A/5720A Series II Calibrator Service Manual 3321 A9/A10: 10M Ohm Ratio Fault The 2/5/10V SOURCE circuit on the Ohms Cal assembly is set to 10V which is routed to the Ohms Main assembly and connected to the 10 MΩ string. The resulting 1V across the 1 MΩ portion is measured for 1V ±3% ±15 mV. A failure indicated the Ohms Main assembly (A10) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3327 A9/A10: 1 Kilohm Check Fault The Current assembly (A7) outputs 1.3 mA which is routed to the Ohms Main assembly (A10), via INT OUT HI, where it is connected to the 1 kΩ string. The voltage drop across the 1 kΩ string is measured for 1.3V ±3% ±15 mV. A failure indicates the Ohms Main assembly is probably at fault. 3328 A9/A10: 1.9 Kilohm Check Fault The Current assembly (A7) outputs 1.
5700A/5720A Series II Calibrator Service Manual 3334 A9/A10: 1.9 Ohm Check Fault The Current assembly (A7) outputs 13 mA which is routed through the Ohms Main assembly (A10), via INT OUT HI, to the Ohms Cal assembly (A9) where it is connected to the 1.9Ω resistance. The voltage drop across the 1.9Ω resistance is measured for 24.7 mV ±3% ±15 mV. A failure indicates the Ohms Cal assembly is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 assembly. The resulting 0.2V across the 10 kΩ portion of Z5 is connected to the +input of the differential amplifier. The output of the differential amplifier is routed to the adc circuit on the DAC assembly, via the RCL line, and measured for 0V ±3% ±15 mV. A failure indicates the calibration of the 100Ω resistance on the Ohms Main assembly (A10) is probably at fault.
5700A/5720A Series II Calibrator Service Manual 3406 A13: 8255 Port B The diagnostics software reads port B of the 8255 IC on the Oscillator Output assembly during the instruments dormant state. A failure indicates the Oscillator Output assembly (A13) is probably at fault. 3407 A13: 8255 Port C The diagnostics software reads port C of the 8255 IC on the Oscillator Output assembly during the instruments dormant state. A failure indicates the Oscillator Output assembly (A13) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 within ± 100 mV. A failure indicates the Oscillator Control assembly (A12) is probably at fault. 3414 A12/A13: Nonlinear Control Loop 2vrng The instrument is set for 1V 1 kHz operation. Signal ERROR INT. OUT on the Oscillator Control assembly is measured via the SDL line to be 0V ±5.0V. A failure indicates the Oscillator Control assembly (A12) is probably at fault.
5700A/5720A Series II Calibrator Service Manual measured via the RCL line. The output of this ac/ac sensor is measured by comparing it to the DAC assembly output voltage. The difference is measured to be 0V ±100 mV. A failure indicates the Oscillator Control assembly (A12) is probably at fault. 3422 A12: AC Cal Sensor (20V Range) The instrument is set for 21.9V 1 kHz and configured as in the 20V range ac/ac calibration.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3503 A16: 8255 Port C The diagnostics software read port C of the 8255 IC on the Power Amp assembly. A failure indicates the Power Amp assembly (A16) is probably at fault. 3504 Spare This fault code is not used. 3505 Spare This fault code is not used. 3506 Spare This fault code is not used. 3507 A16: PA Supplies Are Off The instrument is dormant.
5700A/5720A Series II Calibrator Service Manual resulting in a -130V Power Amplifier output. The second is the normal 220V dc operation with the input voltage from the DAC assembly. In this mode the Power Amplifier is outputting 22.1V, 100V, 219V, and -219V. In each mode the Power Amplifier output voltage is measured to be the nominal ±10% by connecting MUX3 to the SDL line where it is measured by the adc circuit on the DAC assembly.
Troubleshooting Interpreting Diagnostic Fault Codes 5 hybrid is warmed up and regulating. The heater voltage is measured to be 0.7V ±10% ±0.2V. A failure indicates the Power Amplifier assembly (A16) is probably at fault. 3521 Assembly A16 Is Not Responding At power up the instrument checks to see what assemblies are not installed. This test verifies that the Power Amplifier is not responding. A failure indicates the Power Amplifier assembly (A16) is probably at fault.
5700A/5720A Series II Calibrator Service Manual input of the 220V RANGE AC ATTENUATOR circuit which has a nominal gain of -.01. The resulting +1.3V at its output is measured to be within 10% by connecting it to the RCL line and routing it to the +input of the adc circuit on the DAC assembly. The DAC output is connected to the -input and adjusted until a null is achieved. A failure indicates the Power Amplifier assembly (A16) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 Crossing assembly (A17) is faulty. If the voltage is within tolerance, the diagnostic circuit on the Oscillator Output assembly (A13) is faulty. 3605 -42S Supply Fault The instrument is dormant and the -44 S supply is out of tolerance. Measure the unregulated -44 S voltage on the Filter/PA Supply assembly (A18). COM = TP22, HI = TP9. The voltage should be -45V to -75V. If the voltage is out of tolerance, the Filter/PA Supply assembly (A18) is faulty.
5700A/5720A Series II Calibrator Service Manual Note All of the following connections and measurements are done on the Filter/PA Supply assembly (A18) in order to verify operation of the +PA supply. Connect DMM COM to TP203 and the high to TP201. Using a jumper, connect TP207 to TP203 and power on the instrument. The DMM should read +180V ±10%. Using another jumper connect TP205 to TP203. The DMM should read +360V ±10%.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3615 S Com Ground Fault The Current/Hi Res assembly (A7) connects SCOM to the SDL line where it is measured by the adc circuit on the DAC assembly for 0V ±50 mV relative to RCOM. 3700 A21: 8255 Control Word The diagnostics software reads the control word of the 8255 IC on the Rear Panel assembly. A failure indicates the Rear Panel assembly (A21) is probably at fault.
5700A/5720A Series II Calibrator Service Manual 3801 A8: 8255 Port A Fault The diagnostics software writes and reads to port A of the 8255 IC on the Switch Matrix assembly. A failure indicates the Switch Matrix assembly (A8) is probably at fault. 3802 A8: 8255 Port B Fault The diagnostics software reads port B of the 8255 IC on the Switch Matrix assembly. A failure indicates the Switch Matrix assembly (A8) is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3808 A8: Zero Amp Hi Offset The Internal Cal Zero Amplifier circuit on the Switch Matrix assembly is tested for excessive offset in the high gain configuration. This is done by connecting the circuit input to RCOM, by turning on Q7, and connecting the output to the RCL line where it is measured by the adc circuit on the DAC assembly. The adc circuit takes ten readings and this failure occurs if the average value is over 0.155V.
5700A/5720A Series II Calibrator Service Manual 3822 Spare This fault code is not used. 3823 Spare This fault code is not used. 3824 A8: Oven Regulation Fault The heater voltage of the Switch Matrix HR1 hybrid assembly is measured to ensure it is warmed up and regulating by connecting OVEN TEMP to the SDL line where it is measured by the adc circuit on the DAC assembly. OVEN TEMP is measured to be 0.7V ±10% ±0.2V. A failure indicates the Switch Matrix (A8) assembly is probably at fault.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3905 A6: Phase Lock Loop At 10MHz The Wideband assemblies are configured to 3.5V at 1.3 MHz, 1.2V at 1.3 MHz, 2.0V at 3.0 MHz, 1.0V at 4.1 MHz, 3.3V at 5.0 MHz, 2.0V at 6.0 MHz, 2.0V at 7.0 MHz, and 2.0V at 7.9 MHz.
5700A/5720A Series II Calibrator Service Manual level it is checked for 0.0V ±0.7V. A failure indicates the Wideband Output (A5) assembly is probably at fault. 3911 A5/A6: Ampl. Control At 30MHz The Wideband assemblies are configured for a 3.5V and 1.2V output at 30.0 MHz. WB AMPLITUDE CONTROL which it the control signal to the Wideband Oscillator assembly is divided and connected to the SDL line for measurement by the adc circuit on the DAC assembly. At the 3.5V level it is checked to be 4.8V ±1.
Troubleshooting Interpreting Diagnostic Fault Codes 5 3916 A5: 20DB Output Attenuation Fault The 6.5V reference (BRF6, BSRF6) is connected to the Unity Gain Amplifier circuit on the Wideband Output assembly which drives the output through the Attenuators. The Wideband Output assembly is set for 20 dB attenuation so the 6.5V input results in a 0.325V output into 50Ω. This 0.325V is connected to the RCL line which is routed to the +input of the adc circuit on the DAC assembly.
5700A/5720A Series II Calibrator Service Manual 3923 A5: 8255 Was Reset The control word of the 8255 on the Wideband Output is read. A failure indicates the Wideband Output (A5) assembly is probably at fault. 5-3. Component-level Troubleshooting Warning Servicing described in this section is to be performed byqualified service personnel only. To avoid electricalshock, do not perform any servicing unless qualified todo so.
Troubleshooting Component-level Troubleshooting 5 voltage at TP2 and verify it is 0.317 times the voltage at TP1 ±10%. If a failure is detected, check U5 and associated components. Note During Wideband operation, internal software monitors the output and makes corrections or trips the instrument to standby. This internal monitoring can cause problems when attempting to troubleshoot the Wideband Output assembly.
5700A/5720A Series II Calibrator Service Manual voltages of 3V, 1V, 300 mV, and 30 mV, all at 1 kHz, and verify the DMM read the selected voltage ±5%. If a failure is detected, check K4-K8, Z1, and Z2. Next, connect the supplied output cable and 50Ω terminator to the WIDEBAND connector of the Calibrator front panel. Refer to the 5700A/5720A Series II Operators manual and run Wideband Gain calibration.
Troubleshooting Component-level Troubleshooting 5 logic high by measuring U15 pin 5. If the signal is incorrect, the control line WB ON/OFF* from the Wideband Output (A5) assembly is probably at fault. If the control line is correct check U15A and associated components. Note The input CLK and CLK* is a low-level (400 mV p-p) signal generated by the Regulator/Guard Crossing assembly. 4. Check the 4 MHz to 8 MHz feedback signal. Set the Calibrator to 1V at 1.2 MHz, operate.
5700A/5720A Series II Calibrator Service Manual frequency counter to TP3 and adjust the external dc reference until the frequency counter reads 64 MHz ±0.1%. Using the frequency counter, measure the frequency at TP4 and verify it reads 32 MHz ±0.1%. If a failure is detected, check U4 and associated components. Next, measure the frequency at pins 15, 13, 4, and 2 of U5 and verify that pin 15 measures 16 MHz ±0.1%, pin 13 measures 8 MHz ±0.1%, pin 4 measures 4 MHz ±0.1%, and pin 2 measures 2 MHz ±0.1%.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-4.EPS Figure 5-4. Waveform at Pins 14 and 15 of U1 Note Power down the Calibrator, remove the external dc reference, and replace shorting header E6 on the J6 pins before continuing. 10. Check the Multiplexer U6 and its control lines. Power up the Calibrator and it to 1V at 1.2 MHz, operate.
5700A/5720A Series II Calibrator Service Manual switches to a high(~+17V) level while all the others remain at a low (-11V) level. If a failure is detected, check U8, U10, U11, and U13. 14. Check the Filters. Disconnect the cable between the Wideband Oscillator assembly and Wideband Output assembly at J1 on the Wideband Output assembly. Set the Calibrator to 1V at 1.2 MHz, 1.9 MHz, 2 MHz, 3.9 MHz, 4 MHz, 7.9 MHz, 8 MHz, 15.9 MHz, 16 MHz, and 30 Mhz.
Troubleshooting Component-level Troubleshooting 5-6. 5 Troubleshooting the Current/Hi-Res Assembly (A7) The Current/Hi-Res assembly generates output current and contains the high-resolution oscillator onto which the Oscillator Control assembly phase locks. Since these two functions are independent except for their digital control, troubleshooting procedures for each portion are presented separately. 5-7.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-6.EPS Figure 5-6. Waveform at Pin 11 of K2 4. Check the 220 µA range of the 220 µA/2.2 mA AMP circuit. Set the Calibrator to 200 µA, standby. Set the external ac reference to 6.4V(±0.1V) at 1 kHz. Using a DMM, measure the ac voltage at the collector of Q4 and verify it is 2.0V ac ±10%. If a failure is detected, first verify that the 10 kΩ shunt on HR2 is correct and that it is connected to SCOM thought relays K5C, K5D, K10, K13 and the 1.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-7.EPS Figure 5-7. Waveform at Pin 6 of K2 10 k Ω HR2 SHUNT 2V ac ±10% 1.2 Ω R14 K5C, K5D, K10, K13 SCOM F5-8.EPS Figure 5-8. Verifying the 220 µA Range of the 220 µA/2.2 mA Amp Circuit 5. Check the 2.2 mA Range of the 220 µA/2.2 mA AMP. Set the Calibrator to 2 mA, standby. Set the external ac reference to 6.4V at 1 kHz. Measure the ac voltage at the collector of Q4 with a DMM and verify it is 2.0V ac ±10%.
5700A/5720A Series II Calibrator Service Manual 10 k Ω HR2 SHUNT 2V ac ±10% 1.2 Ω R14 K7C, K5D, K10, K13 SCOM F5-9.EPS Figure 5-9. Verifying the 2.2 mA Range of the 220 µA /2.2 mA Amp Circuit 10 k Ω HR2 SHUNT 2V ac ±10% 1.2 Ω R14 K8C, K7A, K5, K10, K13 SCOM F5-10.EPS Figure 5-10. Verifying the 22 mA Range of the 22 mA/220 mA Amp Circuit 7. Check the 220 mA Range of the 22 mA/220 mA AMP. Set the Calibrator to 200 mA, standby. Set the external ac reference to 4.6V (±0.1V) at 1 kHz.
Troubleshooting Component-level Troubleshooting 10 k Ω HR2 SHUNT 2V ac ±10% 5 1.2 Ω R14 K9C, K8C, K7A, K5D, K10, K13 SCOM F5-11.EPS Figure 5-11. Verifying the 220 mA Range of the 22 mA/220 mA Amp Circuit 9. Check the POS. FB BUFFER. Set the Calibrator to 200 mA, standby. Set the external ac reference to 4.6V at 1 kHz. Using a DMM measure the ac voltage at pin 5 of the HR2 resistor network and Note the reading.
5700A/5720A Series II Calibrator Service Manual 5-8. Hi-Res Oscillator Section Proceed as follows to troubleshoot the Hi-Res Oscillator Section of the Current/Hi-Res assembly (A7): 1. Remove the four small shields (two on each side) and place the Current/Hi-Res assembly on the analog reverse extender card. Power up the Calibrator. Note All measurements are referenced to LHCOM (TP18). 2. Check the 8 MHz reference. Set the Calibrator to 2V at 1 kHz, operate.
Troubleshooting Component-level Troubleshooting 5 5. Check VCO Supply Voltage. Set the Calibrator to 2V at 1 kHz, operate. Using a DMM measure the voltage at U19 pin 8 and verify it is -5.25V±7%. If a failure is detected, check U18A, Q15, VR3, and associated components. 6. Check the VCO circuit. Power down the Calibrator, cut jumper E2 and connect an external variable dc reference (2 to 12V) to TP11 (common to TP18). Power up the Calibrator and set it for 2V at 1 kHz. Connect a frequency counter to TP13.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-14.EPS Figure 5-14. Waveform at TP13 8. Check the LOOP FILTER circuit. Power down the Calibrator, cut jumper E2 and connect an external variable dc reference (2 to 12V) to TP11(common to TP18). Power up the Calibrator and set it for 2V at 1 kHz. Connect a frequency counter to TP13 and adjust the external dc reference so the frequency counter read less than 10 MHz (~9.8 MHz).
Troubleshooting Component-level Troubleshooting 5 These relays are latched in the set or reset position and remain in that position even after power has been removed. To troubleshoot the signal path through the Switch Matrix assembly simply set the Calibrator to the function in which a problem is detected and then turn off the Calibrator. Now remove the Switch Matrix from the instrument and, using an ohmmeter, check the signal path by using the relay chart in the schematic section.
5700A/5720A Series II Calibrator Service Manual Note This 2V can be as much as ±0.12V if the DAC assembly is uncalibrated. If a failure is detected, check the HR1 hybrid, U19, Q4, and associated components. 6. Check the mV Dividers. Set the Calibrator to 200 mV at 1 kHz, operate. Using a DMM measure the ac voltage at the cathode of CR6 (common to OUTPUT LO binding post) and verify it is 200 mV ±1%. Next, set the Calibrator to 20 mV at 1 kHz operate and again measure the ac voltage at the cathode of CR6.
Troubleshooting Component-level Troubleshooting 5 less than 4 µV. If a failure is detected check U7, U8, and associated components. Using a DMM measure the dc voltage across the 500Ω resistor in Z2 by connecting the DMM HI to TP18 and the DMM LO to TP17. Note this voltage which should be around 5.0V. Next, measure the voltage across the 1 kΩ resistor in Z2 by connecting the DMM HI to TP16 and the DMM LO to TP6.
5700A/5720A Series II Calibrator Service Manual Note The connection from the test points to the resistance values is through latching type relays for all resistances except 10M, 19M, and 100 MΩ values. These relays are put in the set or reset position and remain in that position even after power has been removed. To troubleshoot the path through the relays, simply set the Calibrator to the function in which a problem is detected and then turn off the Calibrator.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-17.EPS Figure 5-17. Waveform at TP6 1V 10 ms F5-18.EPS Figure 5-18.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-19.EPS Figure 5-19. Waveform at TP4, Calibrator Set to 6.5V 5. Check CH2 FILTER INPUT. Connect an oscilloscope probe to TP7 (common to TP3). Set the Calibrator to 6.5V dc, operate. Set the oscilloscope to 2V/div at 2 ms/div. Verify the oscilloscope displays pulses similar to those shown in Figure 520.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-20.EPS Figure 5-20. Waveform at TP7 Note The duty cycle may differ from this figure. Using the Calibrator edit knob, vary the second LSD of the Calibrator output display and verify that the duty cycle of the signal at TP7 changes. If either of these displayed signals are incorrect, skip to Duty Cycle Control Circuit. 6. Check the SERIES LINEARITY CONTROL CIRCUIT. Using a DMM measure the voltage at U38 pin 6 (common to TP3).
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-21.EPS Figure 5-21. Waveform at TP5 9. Check the FILTER INPUT. Set the Calibrator to 6.5V dc, operate. Measure the voltage with a DMM at TP1 (common to TP3 on the main board) on the DAC Filter SIP assembly (A11A1). It should be a nominal +6.5V dc(±0.1V for an uncalibrated instrument), free of distortion, and stable. If a failure is detected, check the DAC Filter SIP assembly. 10. Check the DC AMP HYBRID. Set the Calibrator to 10V dc, operate.
Troubleshooting Component-level Troubleshooting 5 14. Check the DAC 20V Range. Set the Calibrator to 20V dc, operate. Using a DMM measure the DAC output voltage at TP8 (common to TP3). It should be a nominal 20V dc (±0.5V for an uncalibrated instrument). If a failure is detected, check Q14, Q15, Q18, Q19, Q20, Q21, and their associated components. 15. Check the SHUNT LINEARITY CONTROL CIRCUIT. Set the Calibrator to 10V dc, operate. Measure the voltage with a DMM at U2 pin 7 (common to TP3).
5700A/5720A Series II Calibrator Service Manual approximately a 50% duty cycle. Connect the oscilloscope to pin 6 of U14 and verify it to be the compliment signal. If either signal is incorrect, U14 is probably at fault. 1V 10 ms F5-22.EPS Figure 5-22. Waveform at Pin 10 of U6 9. Check CH1 SHUNT. Connect an oscilloscope to TP6 (common to TP3). Set the Calibrator to 6.5V dc, operate, and set the oscilloscope to 2V/div at 2 ms/div. The oscilloscope should display a signal similar to Figure 5-25.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-23.EPS Figure 5-23. Waveform at Pin 6 of U13 1V 10 ms F5-24.EPS Figure 5-24.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-25.EPS Figure 5-25. Waveform at TP6 10. Check CH1 SERIES B. Connect an oscilloscope to TP4 (common to TP3).Set the Calibrator to 6.5V dc, operate, and the oscilloscope to 10V/div at 2 ms/div. The oscilloscope should display a signal similar to previously shown Figure 5-19. If a failure is detected, check Q33, Q34, and their associated components. 11. Check CH2 FLOATING.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-26.EPS Figure 5-26. Waveform at Pin 7 of U12 5-15. ADC Circuit Proceed as follows to troubleshoot the ADC circuit: 1. Check the ADC INPUT select circuit. Set the Calibrator to 10V dc, operate. Verify that the voltage at U23 pin 7 (common to TP12) is 0.45V±7%. If this voltage is incorrect, check U23 and its control lines. At this time DAC HI DIAG is divided by R79 and R84 (0.45V)and selected by control line DAC DIAG SEL. 2.
5700A/5720A Series II Calibrator Service Manual 8. Check the ADC +6.4V Reference. Verify that the voltage at U27 pin 1(common to TP12) is 6.4±0.2V. If this voltage is incorrect, check U27B and associated components. 9. Check the ADC SAMPLE/HOLD +BOOTSTRAP supply. Set the Calibrator to standby. Verify that the voltage at U29 pin 7 (common to TP12) is between 5.4 and 8.2V. If this voltage is incorrect, check U29, Q56, Q57, VR31-VR34, and associated components. 10. Check the ADC SAMPLE/HOLD -BOOTSTRAP supply.
Troubleshooting Component-level Troubleshooting 5 5-17. Troubleshooting the Oscillator Control Assembly (A12) The first part of this troubleshooting procedure (steps 1 through 7) checks the averaging converter. The second part (steps 8 through 10) checks the AC/DC transfer circuit. Note During normal operation of the Calibrator, internal software monitors the output and makes corrections or trips the instrument to standby.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-27.EPS Figure 5-27. Waveform at Anode of CR4 1V 10 ms F5-28.EPS Figure 5-28. Waveform at Pin 6 of U11 8. Check the DC SENSE BUFFER and the AC SENSE BUFFER. Set the Calibrator to 1.0V at 1 kHz, operate.
Troubleshooting Component-level Troubleshooting 5 the input to the AC/DC sensor. The oscilloscope display should be switching between Figure 5-29, which is the output of the DC SENSE BUFFER circuit and Figure 5-30, which is the output of the AC SENSE BUFFER circuit. If either of these signals is incorrect, check the appropriate SENSE BUFFER circuit as outlined on the schematic. If these voltages are correct, set the Calibrator to 10.
5700A/5720A Series II Calibrator Service Manual 1V 10 ms F5-30.EPS Figure 5-30. AC Sense Buffer Waveform at TP6 5-18. Troubleshooting the Oscillator Output Assembly (A13) Note During normal Calibrator operation, internal software monitors the output and makes corrections or trips the instrument to standby. This internal monitoring can cause problems when attempting to troubleshoot the Oscillator Output assembly.
Troubleshooting Component-level Troubleshooting 5 4. Next, jumper the input of the SUMMING AMPLIFIER to the -5S supply and check the following: • • • • TP5: positive voltage TP4: negative voltage TP3: positive voltage Pin 6 of U8: positive voltage 5. Repair any amplifier circuits which are not properly inverting. Reinstall feedback resistor R6. If the 100 Hz oscillation is still not present, check rectifying diodes CR1-CR4 and the summing resistors in Z6.
5700A/5720A Series II Calibrator Service Manual 11. Check the Phase Lock circuit. Connect a frequency counter to the Calibrator output. Set the Calibrator to 2V at 1 kHz, operate, and check the frequency accuracy to be within 0.01% of the nominal. If the frequency is out of tolerance, proceed as follows: a. Check the ZERO CROSSING DETECTORS by connecting an oscilloscope to U23 pins 7 and 12 (common = TP1). Ensure they convert the sine wave inputs to square wave outputs. b.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-31.EPS Figure 5-31. Waveform at TP3 3. Check the High Voltage Control in the 1100V ac range. Set the Calibrator to 220V at 110 Hz and 130 Hz, operate. At both output frequencies measure with a DMM the ac voltage at pin 1A or 1C of connector P611 and verify it reads 220±0.2V. In this range the High Voltage Control assembly and Power Amplifier assembly work together to form an overall amplifier with a gain of -100.
5700A/5720A Series II Calibrator Service Manual CR4, and associated components. If the measure voltage is much greater than 227V skip to the Magnitude Control Circuit troubleshooting starting at step 10. 7. Check HV OUT from the High Voltage Control assembly. Set the Calibrator to +220V dc, operate. Using a DMM measure the dc voltage at pin 1A or 1C of P611 and verify it reads +220V ±0.2V. If a failure is detected, check K4, K11, K5, K12, K3, and associated components.
Troubleshooting Component-level Troubleshooting 5 power up there is still no signal at TP3 during power up then check U3, U7C/D, and associated components in the Square Wave Amplifier circuit. 4. Check the Absolute Value Circuit. Add a jumper connecting the front panel OUTPUT HI binding post to the OUTPUT LO binding post. Set the Calibrator to 1.0A at 1 kHz, operate. Connect an oscilloscope to G OUT(pin 12C of P612) and Note the amplitude of the positive wave peaks.
5700A/5720A Series II Calibrator Service Manual operation refer to Figure 2-25 in the Theory of Operation section. During normal operation in the 1100V ac mode, internal software monitors the output and makes corrections or trips the instrument into standby. This internal monitoring can cause difficulty when troubleshooting a faulty High Voltage assembly. If during the next step 8 the instrument keeps tripping into standby, defeat the monitoring by connecting a jumper from TP9 to TP10 on the DAC assembly.
Troubleshooting Component-level Troubleshooting 5 1V 10 ms F5-32.EPS Figure 5-32. Waveform at Pin 18 of Hybrid H4 13. Connect an oscilloscope to pin 7 of U3B and verify it displays a square wave equal to the positive peaks of Figure 5-32. Next, connect the oscilloscope to pin 1 of U3A and verify it displays a square wave equal to the negative peaks of Figure 5-32. If a failure is detected, check U3 and associated components.
5700A/5720A Series II Calibrator Service Manual 1. Power up the Calibrator. In the following steps, reference all measurements to PACOM (TP10) unless otherwise Noted. 2. Set the Calibrator to 22V at 1 kHz, operate. This configures the Power Amplifier assembly as an amplifier with a gain of -10 as shown in Figure 5-33. Check the input for the correct voltage. Using a DMM, measure the ac voltage at TP3 and verify it is 2.2V ±5%. If this voltage is incorrect, check relay K10A and its drive circuit.
Troubleshooting Component-level Troubleshooting 5 7. Check the output of the Output Stage. Set the Calibrator to 0V dc, standby. Connect an external 100Ω 1/4W carbon-film resistor between PACOM (TP10) and 1ST MID STAGE OUT, which is the left side of 1W resistor R41. Measure the dc voltage at the Mid-Stage output as is step 4. If the voltage is +0.8V, then the voltage at TP6 (PA OUT HI)should be +3.2±0.3V. If the voltage measured at the Mid-Stage output is -1.1V, then the voltage at TP6 should be +1.3±0.
5700A/5720A Series II Calibrator Service Manual DMM, measure the voltage at U9 pin 6 and verify it is the equal to the voltage at TP12 divided by 8 ±1%. If a failure is detected, check the HR8 resistor network, U9, and the associated components. 5-23. Troubleshooting the Filter/PA Supply Assembly (A18) Proceed as follows to troubleshoot the Filter/PA Supply assembly (A18): 1. Place the Filter/PA Supply assembly on the extender card. Remove the Power Amplifier assembly (A16) and power up the Calibrator.
Troubleshooting Component-level Troubleshooting 5 J201. The +PA supply (at +180V)should go into current limit. The oscilloscope should show a repeating pattern in which the +PA supply climbs to about +180V then drops to 0V. If a failure is detected, check Q203, VR246, VR213, U201C, and associated components. 10. Check the unregulated -250V Supply. Using a DMM, measure the dc voltage at TP212 and verify it is -280V ±10%.
5700A/5720A Series II Calibrator Service Manual 5-84
Chapter 6 List of Replaceable Parts Title 6-1. 6-2. 6-3. 6-4. 6-5. Introduction .......................................................................................... How to Obtain Parts ............................................................................. Manual Status Information................................................................... Newer Instruments................................................................................ Service Centers.................................
5700A/5720A Series II Calibrator Service Manual 6-2
List of Replaceable Parts Introduction 6 6-1. Introduction This section contains an illustrated list of replaceable parts for the 5700A/5720A Series II. Where applicable, parts differences are indicated between the 5700A and 5720A. For example, Table 6-1 indicates MP36 (nameplate) is PN 600723 for a 5700A or PN 600759 for a 5720A. Parts are listed by assembly; alphabetized by reference designator.
5700A/5720A Series II Calibrator Service Manual 6-5. Service Centers To locate a service center, use the information located in Contacting Fluke earlier in this manual. Manual Status Information Ref or Option No. 6-4 Assembly Name Fluke Part No.
List of Replaceable Parts Service Centers 6 Table 6-1. Front Panel Final Assembly Reference Designator A1 A2 A3 A4 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A20 A20 A21 A22 CP1 E1 E2 H5 H20 H25 H29 H32 H43 MP1 MP2 MP3 MP4 MP6 MP14 MP17 MP19 MP20 MP21 MP22 MP23 MP24 MP25 MP26 MP27 MP28 MP35 MP36 MP36 MP37 TM1 TM2 TM3 Description * * * * * * * * * * * * * * * * * * * * * KEYBOARD PCA FRONT PANEL PCA ANALOG MOTHERBOARD PCA DIGITAL MOTHERBOARD PCA CURRENT/HIGHT RESOLUTION OSCILLTOR.
5700A/5720A Series II Calibrator Service Manual 5700A-T&B f6-1.eps Figure 6-1.
List of Replaceable Parts Service Centers 6 Table 6-1. Chassis Final Assembly Reference Designator Description Fluke Stock No Tot Qty A22 TRANSFORMER/MODULE ASSEMBLY 813527 1 B1,B2 FAN/CONNECTOR ASSEMBLY 761213 2 E1 WF1 BINDING HEAD, PLATED 102889 1 FUSE,.25X1.25,1.25A,250V,SLOW 109231 1 H1 INSULATOR, ANALOG BOTTOM 775361 1 H2 SCREW,PH,P,LOCK,SS,6-32,.500 320051 9 H14 SCREW,PH,P,LOCK,STL,6-32,.750 114223 14 H21 SCREW,PH,P,LOCK,STL,6-32,.
5700A/5720A Series II Calibrator Service Manual 5700A T&B (1 of 2) f61a1.eps Figure 6-2.
List of Replaceable Parts Service Centers 6 5700A T&B (2 of 2) f61a2.eps Figure 6-2.
5700A/5720A Series II Calibrator Service Manual Table 6-1. Rear Panel Final Assembly Reference Designator 6-10 Description Fluke Stock No Tot Qty F1 FUSE,.25X1.25,1.25A,250V,SLOW 851936 H1 FILTER, AIR 813493 1 1 H3 SCREW,CAP,SCKT,SS,8-32,.375 837575 4 H7 SCREW,PH,P,LOCK,STL,6-32,.750 114223 6 H13 SCREW,PH,P,LOCK,STL,6-32,.250 152140 1 MP1 REAR PANEL 886387 1 MP2 GROMMET,EXTRUDED,POLYETHYLENE,.
List of Replaceable Parts Service Centers 6 5700A-T&B f61b.eps Figure 6-3.
5700A/5720A Series II Calibrator Service Manual Table 6-2.
List of Replaceable Parts Service Centers 6 5700A-1603 57001603.EPS Figure 6-4.
5700A/5720A Series II Calibrator Service Manual Table 6-3. A2 Front Panel PCA Reference Designator Description Tot Qty C1, C2 CAP,TA,47UF,+-20%,10V 746990 2 C4,C9-20,C28, C30,C35,C37, C39-046,C64 CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 747287 747287 26 C3,C21-27,C29, C31,C36,C38, C47-50,C66 CAP,TA,10UF,+-20%,25V,6032 927814 927814 927814 17 C5,C33,C65 CAP,TA,1.5UF,+-20%,50V,6032 929302 3 C6,C8,C32,C34, C51-54 CAP,CER,0.
List of Replaceable Parts Service Centers 6 Table 6-3. A2 Front Panel PCA (cont) Reference Designator Description Fluke Stock No Tot Qty U12 * IC,CMOS,DUAL D F/F,+EDG TRG,SOIC 782995 1 U13 * IC,TTL,HEX INVERTER,W/OPEN COLL,SOIC 741249 1 10 U14-23 * IC,BIMOS,DISPLAY DRIVER,80V,PLCC 741231 U24 * IC,CMOS,PLD,PROGRAMD,5700A-90724,PLCC 837369 1 VR3,VR4 * ZENER,UNCOMP,6.2V,5%,60.5MA,1.5W,SMB 886700 2 VR5 * ZENER,UNCOMP,5.1V,5%,20MA,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1602 57001602.EPS Figure 6-5.
List of Replaceable Parts Service Centers 6 Table 6-4. A3 Analog Motherboard PCA Reference Designator Description Fluke Stock No Tot Qty C1 CAP,POLYES,0.1UF,+-10%,50V 649913 1 C2 CAP,CER,1000PF,+-20%,50V,X7R 697458 1 C3 CAP,TA,1UF,+-20%,35V 697417 1 C4 CAP,TA,4.7UF,+-20%,25V 807644 1 C5 CAP,POLYES,0.47UF,+-10%,50V 697409 1 DIODE,SI,BV=75V,IO=150MA,500MW 203323 2 H1,H2 SCREW,PH,P,LOCK,STL,6-32,.250 152140 2 H3-5 CABLE ACCESS,TIE,4.00L,.10W,.
5700A/5720A Series II Calibrator Service Manual 5700A-1601 57001601.EPS Figure 6-6.
List of Replaceable Parts Service Centers 6 Table 6-5. A4 Digital Motherboard PCA Reference Designator Description Fluke Stock No Tot Qty C1,C4 CAP,TA,10UF,+-20%,35V 816512 2 C2 CAP,CER,1000PF,+-20%,50V,X7R 697458 1 C3 CAP,POLYES,0.1UF,+-10%,50V 649913 1 C5 CAP,POLYES,0.1UF,+-20%,250VAC 542233 1 C6 CAP,CER,6800PF,+-5%,100V,C0G 816710 1 CR3,CR4 DIODE,SI,100 PIV,1.0 AMP 698555 2 F1 FUSE,.25X1.25,3A,250V,SLOW 109280 1 H8-14 CABLE ACCESS,TIE,4.00L,.10W,.
5700A/5720A Series II Calibrator Service Manual 5700A-1605 57001605.EPS Figure 6-7.
List of Replaceable Parts Service Centers 6 Table 6-6. A5 Wideband Output PCA, Option -03 Reference Designator Description Fluke Stock No Tot Qty C1 CAP,CER,4.7PF,+-0.25PF,50V,C0G 721837 1 C2 CAP,CER,22PF,+-2%,50V,C0G 714832 1 C3 CAP,POLYES,0.047UF,+-10%,50V 820548 1 C4,C11-13,C66 CAP,CER,100PF,+-5%,50V,C0G 831495 5 C5 CAP,CER,470PF,+-10%,50V,C0G 733071 1 C6,C52,C53,C79 CAP,POLYES,0.033UF,+-10%,50V 715276 4 C14 CAP,POLYES,0.
5700A/5720A Series II Calibrator Service Manual Table 6-6.
List of Replaceable Parts Service Centers 6 Table 6-6. A5 Wideband Output PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty R69,R70 RES,MF,249,+-1%,0.5W,100PPM 241281 2 R72,R73,R80-83 RES,MF,909,+-1%,0.5W,100PPM 178053 6 R74 RES,CF,20K,+-5%,0.25W 441477 1 R75 RES,MF,10K,+-1%,0.125W,100PPM 168260 1 R78,R79,R86-89 RES,MF,12.7,+-1%,0.125W,100PPM 441766 6 R92-95 RES,MF,75,+-1%,0.125W,100PPM 306027 4 R96-99 RES,MF,187,+-0.1%,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1611 57001611.EPS Figure 6-8.
List of Replaceable Parts Service Centers 6 Table 6-7. A6 Wideband Ocillator PCA, Option -03 Reference Designator Description Fluke Stock No Tot Qty C1-8,C49-51 CAP,TA,4.7UF,+-20%,25V 807644 11 C9,C10 CAP,CER,2700PF,+-5%,50V,C0G 832303 2 C11 CAP,CER,15PF,+-20%,50V,C0G 697524 1 C12,C15,C16, C18-25,C29-33, C35-48,C52, C57,C58,C60, C61,C101,C103, C105-107,C201, C203,C205-207, C301,C303, C305307,C401, C403,C405-407, C501,C503,C505507 CAP,POLYES,0.
5700A/5720A Series II Calibrator Service Manual Table 6-7.
List of Replaceable Parts Service Centers 6 Table 6-7. A6 Wideband Ocillator PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty R58,R112,R212, R312,R412,R512 RES,MF,110,+-1%,0.125W,100PPM 820571 820571 6 R59 RES,MF,14.3K,+-1%,0.125W,100PPM 721803 1 R61 RES,MF,2.49K,+-1%,0.125W,100PPM 810523 1 R62,R64,R65,R69 RES,CC,680,+-5%,0.5W 687803 4 R63 RES,CF,200,+-5%,0.25W 810390 1 R68 RES,MF,1.62K,+-1%,0.125W,100PPM 772004 1 R71 RES,MF,75,+-1%,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1610 57001610.EPS Figure 6-9.
List of Replaceable Parts Service Centers 6 Table 6-8. A7 Current/High-Res Oscillator PCA Reference Designator Description Fluke Stock No Tot Qty C1,C71 CAP,CER,0.22UF,+80-20%,50V,Z5U 649939 2 C2,C3,C18-20, C29,C32-35,C47, C48,C50,C51, C55,C56 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 649913 16 C4,C5 CAP,CER,100PF,+-2%,100V,C0G 812115 2 C6,C7,C21-24, C37,C38,C40, C43,C52,C53, C60,C61 CAP,TA,4.
5700A/5720A Series II Calibrator Service Manual Table 6-8. A7 Current/High-Res Oscillator PCA (cont) Reference Designator Fluke Stock No Tot Qty Notes Q2,Q5,Q16,Q18 * TRANSISTOR,SI,NPN,SMALL SIGNAL 698225 Q3,Q4,Q19 * TRANSISTOR,SI,PNP,40V,0.
List of Replaceable Parts Service Centers 6 Table 6-8. A7 Current/High-Res Oscillator PCA (cont) Reference Designator Description TP1-5,TP7-13, TP16-20 Fluke Stock No Tot Qty JUMPER,WIRE,NONINSUL,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1621 57001621.EPS Figure 6-10.
List of Replaceable Parts Service Centers 6 Table 6-9. A8 Switch Matrix PCA Reference Designator Description Fluke Stock No Tot Qty C1,C3,C18 CAP,CER,470PF,+-10%,50V,C0G 733071 3 C2,C5 CAP,CER,33PF,+-5%,50V,C0G 714543 2 C4 CAP,CER,0.01UF,+80-20%,50V,Z5V 697284 1 C6-9,C12 C13, C15,C16 C21, C25-27 CAP,POLYES,0.
5700A/5720A Series II Calibrator Service Manual Table 6-9. A8 Switch Matrix PCA (cont) Reference Designator Description Tot Qty R27,R28 RES,CF,620,+-5%,0.25W 810408 2 R29,R30 RES,MF,14.3,+-1%,0.125W,100PPM 831396 2 R32 RES,MF,10,+-1%,0.125W,100PPM 820399 1 R36,R37 RES,MF,4.99K,+-1%,0.125W,100PPM 721548 2 R38 RESISTOR A52R,RES,MF,46.4,+-1%,0.125W,100PPM 686995 1 R41,R42 RES,CF,20,+-5%,0.25W 810382 2 R43 RES,MF,150,+-1%,0.
List of Replaceable Parts Service Centers 6 5700A-1622 57001622.EPS Figure 6-11.
5700A/5720A Series II Calibrator Service Manual Table 6-10. A9 Ohms Cal PCA Reference Designator Description Tot Qty C1,C28,C29 C55 CAP,POLYES,0.1UF,+-10%,50V 649913 4 C2,C3,C32,C35 CAP,CER,1000PF,+-20%,100V,X7R 816181 4 C4,C5,C8,C10, C14,C15,C31, C37-43 C45 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 747519 15 C6 CAP,CER,470PF,+-10%,50V,C0G 733071 1 C7,C9,C22 C23 CAP,TA,2.
List of Replaceable Parts Service Centers 6 Table 6-10. A9 Ohms Cal PCA (cont) Reference Designator Description TP1,TP2,TP5-20 Fluke Stock No Tot Qty JUMPER,WIRE,NONINSUL,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1631 57001631.EPS Figure 6-12.
List of Replaceable Parts Service Centers 6 Table 6-11. A10 Ohms Main PCA Reference Designator Description Fluke Stock No 747519 747519 Tot Qty C1,C2,C7 C1013,C16 CAP,POLYES,0.22UF,+-5%,50V C3,C4 CAP,TA,10UF,+-20%,35V 816512 2 C6 CAP,TA,4.7UF,+-20%,25V 807644 1 H3-6 RIVET,S-TUB,OVAL,AL,.087,.343 838458 4 H7,H8 SCREW,PH,P,LOCK,STL,6-32,.
5700A/5720A Series II Calibrator Service Manual 5700A-1630 57001630.EPS Figure 6-13.
List of Replaceable Parts Service Centers 6 Table 6-12.
5700A/5720A Series II Calibrator Service Manual Table 6-12. A11 DAC PCA (cont) Reference Designator Description Tot Qty MP31 MOLDED COVER, REF.
List of Replaceable Parts Service Centers 6 Table 6-12. A11 DAC PCA (cont) Reference Designator Description Fluke Stock No Tot Qty R68 RES,MF,40K,+-0.1%,0.125W,100PPM 821702 1 R69 RES,MF,18.12K,+-0.1%,0.125W,50PPM 734020 1 R72 R74 * RES,CF,200,+-5%,0.25W 810390 1 RES,CERM,470K,+-5%,.125W,200PPM 746792 1 R79-81 * RES,CERM,100K,+-1%,.125W,100PPM 769802 3 R82,R115,R116 * RES,CERM,10K,+-5%,.125W,200PPM 746610 0 R86,R87,R100 * RES,CERM,330,+-5%,.
5700A/5720A Series II Calibrator Service Manual Table 6-12. A11 DAC PCA (cont) Description Reference Designator Tot Qty VR13 * ZENER 5243 SMR,ZENER,UNCOMP,13V,5%,9.5MA,0.2W,SOT-23 642477 1 VR18,VR22 * ZENER 5245 SMR,ZENER,UNCOMP,15V,5%,8.5MA,0.2W,SOT-23 837187 2 VR25 * ZENER,UNCOMP,3.3V,10%,20.0MA,0.4W 309799 1 VR26 * ZENER,UNCOMP,3.3V,5%,20MA,0.2W 807008 1 VR27 * ZENER,UNCOMP,7.5V,5%,20MA,0.2W 837138 1 VR28 * ZENER,UNCOMP,8.2V,5%,20MA,0.2W 837146 1 VR29 * ZENER,COMP,6.
List of Replaceable Parts Service Centers 6 5700A-1640 57001640.EPS Figure 6-14.
5700A/5720A Series II Calibrator Service Manual Table 6-13. A11A1 DAC Filter SIP PCA Reference Designator 6-46 Description Fluke Stock No Tot Qty C1-6 CAP,POLYES,0.33UF,+-20%,50V 853903 6 C10,C11 CAP,POLYPR,1UF,+-5%,50V,HERMETIC 783811 2 C12,C13 CAP,CER,0.22UF,+80-20%,50V,Y5V,1206 740597 2 C14 CAP,CER,100PF,+-10%,50V,C0G,1206 740571 1 P21,P22 HEADER,2 ROW,.100CTR,RT ANG,6 PIN 912217 2 2 R1,R2 * RES,CERM,11K,+-5%,.125W,250PPM 769752 R3,R5 * RES,CERM,18K,+-5%,.
List of Replaceable Parts Service Centers 6 5700A-1643 57001643.EPS Figure 6-15.
5700A/5720A Series II Calibrator Service Manual Table 6-14. A11A2 DAC Buffered Reference SIP PCA Reference Designator 6-48 Description Fluke Stock No Tot Qty C1,C5 CAP,CER,10PF,+-10%,100V,C0G,1206 806943 C2,C3 CAP,CER,0.22UF,+80-20%,50V,Y5V 740597 2 2 C4,C6 CAP,CER,1000PF,+-10%,50V,C0G,1206 747378 2 P11 HEADER,2 ROW,.100CTR,RT ANG,10 PIN 658112 1 P12 HEADER,2 ROW,.100CTR,RT ANG,8 PIN 424200 1 832147 15 Q1-15 * TRANSISTOR,SI,N-JFET,HI-VOLTAG R1,R6-8 * RES,CERM,1K,+-5%,.
List of Replaceable Parts Service Centers 6 5700A-1644 57001644.EPS Figure 6-16.
5700A/5720A Series II Calibrator Service Manual Table 6-15. A12 Oscillator Control PCA Reference Designator Description CAP,TA,4.7UF,+-20%,25V C8,C10 CAP,AL,2.2UF,+-20%,50V 769687 2 C21 CAP,CER,10PF,+-10%,3000V,C0G 817049 1 C22,C25 CAP,TA,330UF,+-20%,3V 385963 2 C23,C24 C3638,C44-47 C49, C50,C56 C57, C61,C64 C65, C67,C68 C7072,C76-81 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 747519 747519 747519 747519 27 C26,C29,C30, C42, C60 CAP,POLYES,0.
List of Replaceable Parts Service Centers 6 Table 6-15. A12 Oscillator Control PCA (cont) Reference Designator Description R3 R4,R12 R5,R13,R25 R48, R52,R53 R68, R69 RES,MF,143K,+-1%,0.125W,100PPM RES,CF,3K,+-5%,0.25W RES,CF,1K,+-5%,0.25W R6 R7 R8-10 R11 R14 R15 R16 R17,R39 R18 R19 R20 R21 R22,R24,R29, R66 RES,CF,750,+-5%,0.25W RES,CF,200,+-5%,0.25W RES,MF,113K,+-1%,0.125W,100PPM RES,CF,20K,+-5%,0.25W RES,CF,22K,+-5%,0.25W RES,CF,5.1K,+-5%,0.25W RES,CF,15,+-5%,0.25W RES,CF,510,+-5%,0.
5700A/5720A Series II Calibrator Service Manual Table 6-15. A12 Oscillator Control PCA (cont) Reference Designator Description Tot Qty U25 * IC,VOLT REG,FIXED,+5 VOLTS,1.5 AMPS 428847 1 VR1,VR2 * ZENER,UNCOMP,10.0V,5%,12.5MA,0.4W 246611 2 VR3 * ZENER,UNCOMP,5.1V,5%,20.0MA,0.4W 159798 1 VR4 * ZENER,UNCOMP,6.8V,2%,175.0MA,5.0W 325845 1 VR5,VR6 * ZENER,UNCOMP,6.8V,5%,37.0MA,1.0W 454595 2 VR7,VR8 * ZENER,UNCOMP,5.1V,5%,20.0MA,0.
List of Replaceable Parts Service Centers 6 5700A-1650 57001650.EPS Figure 6-17.
5700A/5720A Series II Calibrator Service Manual Table 6-16. A13 Oscillator Output PCA Reference Designator Fluke Stock No Tot Qty C2-4,C16, C20, C23 C26-28,C32, C33,C46,C47, C51,C52,C54, C55,C68-71 C8892,C102-104, C110,C111, C113,C114 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 747519 747519 747519 747519 747519 747519 33 C5,C14,C30 CAP,CER,15PF,+-20%,50V,C0G 697524 3 C6,C15,C31 CAP,CER,82PF,+-2%,50V,C0G 714857 3 C7,C8 CAP,CER,0.01UF,+-10%,100V,X7R 557587 2 C17,C29 CAP,CER,2.7PF,+-0.
List of Replaceable Parts Service Centers 6 Table 6-16. A13 Oscillator Output PCA (cont) Reference Designator Description Fluke Stock No Tot Qty MP13-15 SPACER,.375 RND,SOLUBLE,.
5700A/5720A Series II Calibrator Service Manual Table 6-16.
List of Replaceable Parts Service Centers 6 5700A-1651 57001651.EPS Figure 6-18.
5700A/5720A Series II Calibrator Service Manual Table 6-17. A13A1 Oscillator Wideband SMD PCA Reference Designator Description Tot Qty C1,C3,C4,C6-8, C12,C13 CAP,CER,0.22UF,+80-20%,50V,Y5V 740597 740597 8 C2 CAP,CER,100PF,+-10%,50V,C0G,1206 740571 1 C5 CAP,CER,10PF,+-10%,100V,C0G,1206 806943 1 C9 CAP,CER,470PF,+-10%,50V,C0G,1206 747360 1 C10 CAP,CER,1000PF,+-10%,50V,C0G,1206 747378 1 C11 CAP,CER,0.
List of Replaceable Parts Service Centers 6 5700A-1652 57001652.EPS Figure 6-19.
5700A/5720A Series II Calibrator Service Manual Table 6-18. A14 High Voltage Control PCA Reference Designator Description Tot Qty C1 CAP,POLYES,0.72UF,+-20%,1300V 853929 1 C2 CAP,POLYES,0.1UF,+-20%,1400V 821512 1 C3,C4 CAP,AL,470UF,+-20%,16V,SOLV PROOF 772855 2 C5 CAP,POLYES,1UF,+-10%,50V 733089 1 C6,C7 CAP,TA,10UF,+-20%,35V 816512 2 C8,C9 CAP,AL,10UF,+-20%,63V,SOLV PROOF 816843 2 C10,C20,C24-32 CAP,POLYES,0.
List of Replaceable Parts Service Centers 6 Table 6-18. A14 High Voltage Control PCA (cont) Reference Designator Description Fluke Stock No Tot Qty R28 RES,MF,20.5K,+-1%,0.125W,100PPM 655233 R30-32 RES,MF,18.2K,+-1%,0.125W,100PPM 756429 3 R35-39,R50,R52 RES,MF,196K,+-1%,0.125W,100PPM 769984 7 R40,R41 RES,MF,464K,+-1%,0.125W,100PPM 772020 2 R42 RES,CF,1.5K,+-5%,0.25W 810432 1 R43 RES,MF,301K,+-1%,0.125W,100PPM 655274 1 R54 RES,CF,2K,+-5%,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1661 57001661.EPS Figure 6-20.
List of Replaceable Parts Service Centers 6 Table 6-19. A15 High Voltage/High Current PCA Reference Designator Description Fluke Stock No Tot Qty C2,C29,C42 CAP,POLYES,0.01UF,+-10%,50V 715037 3 C4 CAP,POLYPR,0.022UF,+-5%,1500V 806968 1 C5,C15-17,C20, C21 C23-28,C32 C33,C35,C38,C40 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 17 C6 CAP,POLYES,0.
5700A/5720A Series II Calibrator Service Manual Table 6-19. A15 High Voltage/High Current PCA (cont) Reference Designator Description Fluke Stock No R1,R72 RES,CF,1K,+-5%,0.25W 343426 R2,R15,R39 RES,CF,100K,+-5%,0.25W 348920 3 R4,R11,R51 R53, R61-64,R74 RES,CF,100,+-5%,0.25W 348771 348771 9 R5 RES,CF,1.5K,+-5%,0.25W 810432 1 R6,R9 RES,CF,1M,+-5%,0.25W 348987 2 R7 RES,CF,51K+-5%,0.25W 747550 1 R8,R19 RES,CF,3K,+-5%,0.25W 441527 2 R10 RES,CF,820,+-5%,0.
List of Replaceable Parts Service Centers 6 5700A-1660 57001660.EPS Figure 6-21.
5700A/5720A Series II Calibrator Service Manual Table 6-20. A16 Power Amplifier PCA Reference Designator Description Tot Qty C1,C2 CAP,CER,10PF,+-10%,3000V,C0G 817049 2 C3 CAP,MICA,560PF,+-5%,500V 170431 1 C4,C28 CAP,CER,0.02UF,+-20%,500V,Z5U 407403 2 C5,C75 CAP,POLYES,0.047UF,+-10%,50V 820548 2 C6,C17,C23 CAP,CER,22PF,+-10%,1000V,C0G 817023 3 C7,C24,C43 CAP,CER,1000PF,+-20%,50V,X7R 697458 3 C8,C13,C16,C20, C47,C49,C60,C61, C68-71 CAP,POLYES,0.
List of Replaceable Parts Service Centers 6 Table 6-20. A16 Power Amplifier PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP7-8 HEAT DIS,PRESS ON,TO-5 418384 2 MP20-23 INSUL PT,TRANSISTOR MOUNT,DAP,TO-5 152207 4 MP41,MP42, MP45-47 SCREW,PH,P,LOCK,STL,6-32,.250 152140 152140 5 MP43,MP44 EJECTOR,PWB,NYLON 494724 2 MP49 HEATSINK, POWER AMP 803007 1 MP50 SHIELD, HIGH VOLTAGE, REAR 791921 1 MP51-54 INSUL PT,TRANSISTOR,NYL,.4,.
5700A/5720A Series II Calibrator Service Manual Table 6-20. A16 Power Amplifier PCA (cont) Reference Designator Description Fluke Stock No Tot Qty R28,R29,R34, R47 RES,MF,499K,+-1%,0.125W,100PPM 714980 714980 4 R30 RES,CF,330,+-5%,0.25W 830596 1 R31 RES,CF,100K,+-5%,0.25W 658963 1 R35,R74,R139 RES,CF,20,+-5%,0.25W 810382 3 R36,R141,R151, R152 RES,CF,47,+-5%,0.25W 822189 822189 4 R37 RES,CF,12K,+-5%,0.25W 757799 1 R38,R118 RES,CF,47K,+-5%,0.
List of Replaceable Parts Service Centers 6 5700A-7670 57001670.EPS Figure 6-22.
5700A/5720A Series II Calibrator Service Manual Table 6-21. A16A1 Power Amplifier Digital Control SIP PCA Reference Designator 6-70 Description Fluke Stock No Tot Qty C52 CAP,AL,15UF,+-20%,35V 614024 1 C53,C56 CAP,CER,33PF,+-5%,50V,C0G 714543 2 C54 CAP,CER,470PF,+-10%,50V,C0G 733071 1 C55,C57 CAP,POLYES,0.22UF,+-5%,50V 747519 2 L4 CHOKE,6TURN 320911 1 MP3 HEADER,2 ROW,.100CTR,RT ANG,10 PIN 658112 1 P1,P2 HEADER,2 ROW,.100CTR,RT ANG,26 PIN 512590 2 R2,R106 RES,CF,1K,+-5%,0.
List of Replaceable Parts Service Centers 6 5700A-1671 Figure 6-23.
5700A/5720A Series II Calibrator Service Manual Table 6-22. A17 Regulator/Guard Crossing PCA Reference Designator Fluke Stock No Tot Qty C1,C2,C4,C6, C7,C9 C11,C12, C14-16,C19-23, C27,C28 CAP,AL,10UF,+-20%,50V,SOLV PROOF 799437 799437 799437 799437 18 C3,C10,C18,C25 CAP,CER,0.
List of Replaceable Parts Service Centers 6 Table 6-22. A17 Regulator/Guard Crossing PCA (cont) Reference Designator Description Fluke Stock No Tot Qty R54 RES,CF,1.8K,+-5%,0.25W 441444 1 R56 RES,CF,150,+-5%,0.25W 343442 1 R57 RES,CF,100,+-5%,0.25W 348771 1 R60,R61 THERMISTOR,DISC,POS,100,+-20%,25C 851303 2 SW51 SWITCH,PUSHBUTTON,SPST,MOMENTARY 782656 1 T51 RF TRANSFORMER, 8 MHZ 813477 1 TP1,TP4,TP6, TP8010,TP12, TP55 TP58 JUMPER,WIRE,NONINSUL,0.
5700A/5720A Series II Calibrator Service Manual 5700A-1680 57001680.EPS Figure 6-24.
List of Replaceable Parts Service Centers 6 Table 6-23. A18 Filter/PA Supply PCA Reference Designator Description Fluke Stock No Tot Qty C1,C10,C17 CAP,POLYES,0.22UF,+-5%,50V 747519 3 C2,C3 CAP,AL,6800UF,+-20%.
5700A/5720A Series II Calibrator Service Manual Table 6-23.
List of Replaceable Parts Service Centers 6 Table 6-23. A18 Filter/PA Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty VR211,VR217, VR227,VR231 * * ZENER,UNCOMP,140.0V,5%,1.8MA,1.0W 340703 340703 4 VR212,VR216, VR226,VR232 * * ZENER,UNCOMP,180V,2%,0.68MA,0.4W 816348 816348 4 VR214,VR230, VR246,VR247 * * ZENER,UNCOMP,56V,5%,2.2MA,0.4W 832568 832568 4 VR215,VR219, VR225,VR229 * * ZENER,UNCOMP,200.0V,5%,5.0MA,5.0W 386839 386839 4 VR245 * 1 ZENER,UNCOMP,3.
5700A/5720A Series II Calibrator Service Manual 5700A-7690 57001690.EPS Figure 6-25.
List of Replaceable Parts Service Centers 6 Table 6-24. A19 Digital Power Supply PCA Reference Designator Description Fluke Stock No Tot Qty C1 CAP,AL,470UF,+-20%,160V 816835 C2 CAP,AL,10UF,+-20%,160V,SOLV PROOF 817064 1 C3 CAP,AL,330UF,+-20%,100V,SOLV PROOF 816785 1 1 C4,C9 CAP,AL,10UF,+-20%,63V,SOLV PROOF 816843 2 C5,C11 CAP,CER,0.10UF,+-20%,50V,X7R 853650 2 C6 CAP,AL,10000UF,+-20%,25V 816819 1 C7 CAP,AL,6800UF,+-20%.25V 782466 1 C8 CAP,AL,2.
5700A/5720A Series II Calibrator Service Manual Table 6-24. A19 Digital Power Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty R3,R12 RES,CF,100K,+-5%,0.25W 348920 R4 RES,CC,4.7K,+-5%,0.25W 348821 1 R5 RES,CF,12,+-5%,0.25W 442178 1 R6 RES,CC,10K,+-10%,2W 641123 1 R7 RES,CC,2,+-5%,0.5W 641057 1 2 R8 RES,CF,120K,+-5%,0.25W 441386 1 R9,R11 RES,CF,33K,+-5%,0.25W 348888 2 R10 RES,CF,51K,+-5%,0.25W 376434 1 R13 RES,CC,10K,+-5%,0.
List of Replaceable Parts Service Centers 6 5700A-1604 57001604.EPS Figure 6-26.
5700A/5720A Series II Calibrator Service Manual Table 6-25. A20 CPU PCA Ref Des Description Part Number Qty C1 CAPACITOR SMR,CAP,TA,220UF,+-20%,10V,7343H 106021 1 C2-4,C6-7 CAPACITOR SMR,CAP,CER,0.1UF,+-10%,50V,X7R,0805 690500 37 C5 CAPACITOR SMR,CAP,TA,15UF,+-20%,35V,7343 690252 1 C8-11 CAPACITOR SMR,CAP,CER,22PF,+-1%,50V,C0G,0805 867663 4 3 C14-16 C18, C101-111, C113, C115, C116, C119120, C125133, C142143, C152 C12-13, C80 CAPACITOR SMR,CAP,CER,0.
List of Replaceable Parts Service Centers 6 Table 6-26. A20 CPU PCA (cont) Ref Des Description Part Number Qty U19 IC,MEMORY,SRAM,7C1021,1MB,64KX16,5V,15NS,TSOP44,TAPE 1609432 U25, U27-29 CMOS 74HCT244 SMR,IC,CMOS,OCTL LINE DRVR,SOIC 742593 4 U26, U30 CMOS 74HCT245 SMR,IC,CMOS,OCTAL BUS TRANSCEIVER,SOIC 742577 2 SM,IC,CMOS,DUAL CHANNEL UART,PLCC 1 U31 CMOS 68C681 866785 1 U32 IC, LOGIC, DS75451, 5.
5700A/5720A Series II Calibrator Service Manual 57001606.EPS Figure 6-27.
List of Replaceable Parts Service Centers 6 Table 6-27. A21 Rear Panel PCA Reference Designator Description Fluke Stock No Tot Qty C1,C3,C5 CAP,CER,330PF,+-5%,50V,C0G 697441 3 C4,C21,C22,C2432,C34,C36,C37, C40-45,C48,C49 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 23 C6,C7 CAP,CER,0.
5700A/5720A Series II Calibrator Service Manual Table 6-27. A21 Rear Panel PCA (cont) Reference Designator 6-86 Description Fluke Stock No Tot Qty U13 * IC,OP AMP,JFET INPUT,22V SUPPLY,DIP 832584 1 U14 * IC,CMOS,PROGRMBL PERIPHERAL INTERFACE 780650 1 U16,U17 * IC,BIMOS,8 CHNL HI-VOLT DRVR W/LATCH 782912 2 U18 * IC,COMPARATOR,HI-SPEED,14 PIN 647115 1 VR1,VR2 * ZENER,UNCOMP,3.3V,10%,20.0MA,0.4W 309799 2 VR3 * ZENER,UNCOMP,4.7V,10%,20.0MA,0.
List of Replaceable Parts Service Centers 6 5700A-1609 57001609.EPS Figure 6-28.
5700A/5720A Series II Calibrator Service Manual 6-88
Chapter 7 Schematic Diagrams Figure 7-1. 7-2. 7-3. 7-4. 7-5. 7-6. 7-7. 7-8. 7-9. 7-10. 7-11. 7-12. 7-13. 7-14. 7-15. 7-16. 7-17. 7-18. 7-19. 7-20. 7-21. 7-22. 7-23. 7-24. 7-25. 7-26. Title A1 Keyboard Assembly ......................................................................... A2 Front Panel PCA............................................................................... A3 Analog Motherboard PCA................................................................ A4 Digital Motherboard PCA ..........
5700A/5720A Series II Calibrator Service Manual 7-2
Schematic Diagrams 7 Figure 7-1.
5700A/5720A Series II Service Manual Figure 7-1.
Schematic Diagrams 7 Figure 7-2.
5700A/5720A Series II Service Manual 7-6 Figure 7-2.
Schematic Diagrams 7 Figure 7-2.
5700A/5720A Series II Service Manual Figure 7-2.
Schematic Diagrams Figure 7-2.
5700A/5720A Series II Service Manual Figure 7-3.
Schematic Diagrams 7 Figure 7-23.
5700A/5720A Series II Service Manual Figure 7-3.
Schematic Diagrams 7 Figure 7-3.
5700A/5720A Series II Service Manual Figure 7-3.
Schematic Diagrams 7 5700A-1605 Figure 7-4.
5700A/5720A Series II Service Manual 7-16 Figure 7-4.
Schematic Diagrams 7 ahp46f.tif Figure 7-4.
5700A/5720A Series II Service Manual 7-18 Figure 7-4.
Schematic Diagrams 7 5700A-1611 Figure 7-5.
5700A/5720A Series II Service Manual Figure 7-5.
7 Schematic Diagrams Figure 7-5.
5700A/5720A Series II Service Manual 7-22 Figure 7-5.
7 Schematic Diagrams 5700A-7610 Figure 7-6.
5700A/5720A Series II Service Manual Figure 7-6.
Schematic Diagrams 7 Figure 7-6.
5700A/5720A Series II Service Manual Figure 7-6.
Schematic Diagrams 7 5700A-1621 Figure 7-7.
5700A/5720A Series II Service Manual Figure 7-7.
Schematic Diagrams 7 Figure 7-7.
5700A/5720A Series II Service Manual Figure 7-7.
Schematic Diagrams 7 5700A-1021 (4 of 4) Figure 7-7.
5700A/5720A Series II Service Manual 5700A-1622 Figure 7-8.
Schematic Diagrams Figure 7-8.
5700A/5720A Series II Service Manual Figure 7-8.
Schematic Diagrams 7 Figure 7-8.
5700A/5720A Series II Service Manual Figure 7-8.
Schematic Diagrams 7 Figure 7-8.
5700A/5720A Series II Service Manual 5700A-1631 Figure 7-9.
Schematic Diagrams 7 Figure 7-9.
5700A/5720A Series II Service Manual Figure 7-9.
Schematic Diagrams 7 Figure 7-9.
5700A/5720A Series II Service Manual Figure 7-9.
7 Schematic Diagrams 5700A-1630 Figure 7-10.
5700A/5720A Series II Service Manual Figure 7-10.
Schematic Diagrams 7 Figure 7-10.
5700A/5720A Series II Service Manual Figure 7-10.
Schematic Diagrams 7 Figure 7-10.
5700A/5720A Series II Service Manual 5700A-7640 Figure 7-11.
Schematic Diagrams 7 Figure 7-11.
5700A/5720A Series II Service Manual R23 6.8 5 1 7 6 U5 OPA527 C42 22uF 2 3 4 R128 200K C112 22uF Figure 7-11.
Schematic Diagrams 7 Figure 7-11.
5700A/5720A Series II Service Manual 7-52 Figure 7-11.
Schematic Diagrams 7 Figure 7-11.
5700A/5720A Series II Service Manual Figure 7-11.
Schematic Diagrams 7 Figure 7-12.
5700A/5720A Series II Service Manual 7-56 Figure 7-13.
Schematic Diagrams 7 5700A-7650 Figure 7-14.
5700A/5720A Series II Service Manual DG211 DG211 DG211 DG211 DG211 3. ALL GND CONNECTIONS DENOTED WITH A 1 ARE BUSSED AND CONNECTED TO GND3 AT ONE POINT. 4. C5 AND C55 ARE NOT INSTALLED. Figure 7-14.
Schematic Diagrams 7 Figure 7-14.
5700A/5720A Series II Service Manual 7-60 Figure 7-14.
Schematic Diagrams 7 5700A-1651 Figure 7-15.
5700A/5720A Series II Service Manual Figure 7-15.
Schematic Diagrams 7 Figure 7-15.
5700A/5720A Series II Service Manual Figure 7-15.
7 Schematic Diagrams 5700A-1652 Figure 7-16.
5700A/5720A Series II Service Manual Figure 7-16.
Schematic Diagrams 7 5700A-1661 Figure 7-17.
5700A/5720A Series II Service Manual 7-68 Figure 7-17.
Schematic Diagrams 7 Figure 7-17.
5700A/5720A Series II Service Manual Figure 7-17.
Schematic Diagrams 7 Figure 7-17.
5700A/5720A Series II Service Manual 5700A-1660 Figure 7-18.
Schematic Diagrams 7 Figure 7-18.
5700A/5720A Series II Service Manual 7-74 Figure 7-18.
Schematic Diagrams 7 5700A-7670 Figure 7-19.
5700A/5720A Series II Service Manual 4. NOT INSTALLED 4. STD1N890 STD1N890 Figure 7-19.
Schematic Diagrams 7 10 M 2N4044 Figure 7-19.
5700A/5720A Series II Service Manual 7-78 Figure 7-19.
Schematic Diagrams 7 5700A-1671 Figure 7-20.
5700A/5720A Series II Service Manual 7-80 Figure 7-20.
Schematic Diagrams 7 5700A-1680 Figure 7-21.
5700A/5720A Series II Service Manual Figure 7-21.
7 Schematic Diagrams Figure 7-21.
5700A/5720A Series II Service Manual 5700A-7690 Figure 7-22.
Schematic Diagrams 7 Figure 7-22.
5700A/5720A Series II Service Manual Figure 7-22.
Schematic Diagrams 7 5700A-1604 Figure 7-23.
5700A/5720A Series II Service Manual Figure 7-23.
Schematic Diagrams 7 Figure 7-24.
5700A/5720A Series II Service Manual Figure 7-24.
Schematic Diagrams 7 Figure 7-24.
5700A/5720A Series II Service Manual Figure 7-24.
Schematic Diagrams 7 Figure 7-24.
5700A/5720A Series II Service Manual Figure 7-24.
Schematic Diagrams 7 Figure 7-25.
5700A/5720A Series II Service Manual Figure 7-25.
Schematic Diagrams 7 Figure 7-25.
5700A/5720A Series II Service Manual Figure 7-25.
Schematic Diagrams 7 Figure 7-25.
5700A/5720A Series II Service Manual Figure 7-25.
Schematic Diagrams 7 Figure 7-26.
5700A/5720A Series II Service Manual Figure 7-26.
Schematic Diagrams 7 Figure 7-26.
5700A/5720A Series II Service Manual Figure 7-26.
Schematic Diagrams 7 Figure 7-26.
0A/5720A Series II Service Manual 7-106
