Agilent 4294A PRECISION IMPEDANCE ANALYZER Service Manual Manual Change Agilent Part No. N/A May 2009 Change 1 Change the Measurement Uncertainty value of Frequency Accuracy Test (Page 68) to the following information and appended TAR to this report. Frequency Accuracy Test Without Option 1D5 Frequency 10MHz Test Limit ±200 Hz Test Result1 Hz Measurement Uncertainty ± 0.3 Hz TAR Measurement Uncertainty ± 0.2 Hz TAR 890 With Option 1D5 Frequency 10MHz Test Limit ±1.
Change 2 Change the Measurement Uncertainty value of OSC Level Accuracy Test (Page 69 to 70) to the following information and appended TAR to this report. OSC Level Accuracy Test OSC Level Accuracy (Accessory: Nothing) OSC Level Frequency Test Limits 1 kHz ± 101 mV 100 kHz ± 101 mV 40 Hz ± 51.0 mV 1 kHz ± 51.0 mV 10 kHz ± 51.0 mV 100 kHz ± 51.0 mV 1 MHz ± 51.3 mV 10 MHz ± 53.5 mV 15 MHz ± 54.8 mV 16 MHz ± 55.0 mV 50 MHz ± 63.5 mV 110 MHz ± 78.5 mV 1 kHz ± 26.0 mV 100 kHz ± 26.
OSC Level Accuracy (with 42942A Terminal Adapter) OSC Level Frequency Test Limits 0.5 V 1 MHz 10 MHz 15 MHz 16 MHz 50 MHz 110 MHz ± 51.3 mV ± 53.5 mV ± 54.8 mV ± 55.0 mV ± 63.5 mV ± 78.5 mV Test Result mV mV mV mV mV mV Measurement Uncertainty ± 5.2 mV ± 5.3 mV ± 5.3 mV ± 5.3 mV ± 5.4 mV ± 5.7 mV TAR 19.6 20.0 20.5 20.6 21.0 19.0 Change 3 Change the Measurement Uncertainty value of DC Bias Level Accuracy Test (Page 70 to 71) to the following information and appended TAR to this report.
Accessory: Nothing Standard: 1pF OSC Level Frequency 1 MHz 0.5 V 3 MHz Parameter Test Limits Cp D Cp D ± 0.0015 pF ± 0.0015 ± 0.0057 pF ± 0.0057 Parameter Test Limits Cp D Cp D Cp D Cp D Cp D ± 0.41 pF ± 0.041 ± 0.0083 pF ± 0.0008 ± 0.033 pF ± 0.0033 ± 0.101 pF ± 0.0101 ± 2.00 pF ± 0.200 Parameter Test Limits Cp D Cp D Cp D Cp D Cp D Cp D Cp D Cp D Cp D Cp D ± 0.47 pF ± 0.0047 ± 0.079 pF ± 0.0008 ± 0.0076 pF ± 0.0008 ± 0.30 pF ± 0.0030 ± 1.00 pF ±0.0100 ±2.07 pF ± 0.0207 ± 0.102 pF ± 0.
Accessory: Nothing Standard: 1000 pF OSC Level Frequency 1 kHz 0.5 V 10 kHz 100 kHz 0.1 V 1 kHz Parameter Test Limits Cp D Cp D Cp D Cp D ± 1.15 pF ± 0.0012 ± 0.79 pF ± 0.0008 ± 0.76 pF ± 0.0008 ± 2.8 pF ± 0.0028 Parameter Test Limits Cp D Cp D Cp D Cp D ± 0.033 nF ± 0.0033 ± 0.0079 nF ± 0.0008 ± 0.0076 nF ± 0.0008 ± 0.0102 nF ± 0.0010 Parameter Test Limits Cp D Cp D Cp D Cp D ± 0.30 nF ± 0.0030 ± 0.076 nF ± 0.0008 ± 0.077 nF ± 0.0008 ± 0.085 nF ± 0.
Accessory: Nothing Standard: 10 Ω OSC Level 0.5 V 0.1 V Frequency Parameter Test Limits 1 kHz 1 kHz R R ± 0.0100 Ω ± 0.0114 Ω Frequency Parameter Test Limits 1 kHz 1 kHz R R ± 0.0033 Ω ± 0.0040 Ω Frequency Parameter Test Limits 1 kHz 1 kHz R R ± 2.6 mΩ ± 3.2 mΩ Test Result Ω Ω Measurement Uncertainty ± 0.003 Ω ± 0.003 Ω Test Result Ω Ω Measurement Uncertainty ± 0.001 Ω ± 0.001 Ω Test Result mΩ mΩ Measurement Uncertainty ± 0.1 mΩ ± 0.
Accessory: 42942A Terminal Adapter Standard: 10 cm Airline with SHORT OSC Level Frequency 1 MHz 0.5 V 10 MHz 100 MHz Parameter Test Limits ⏐Z⏐ θ ⏐Z⏐ θ ⏐Z⏐ θ ± 0.0062 Ω ± 54.4 mrad ± 0.0165 Ω ± 15.3 mrad ± 0.157 Ω ± 14.7 mrad Test Result Ω mrad Ω mrad Ω mrad Measurement Uncertainty ± 0.0017 Ω ± 2.0 mrad ± 0.0043 Ω ± 4.0 mrad ± 0.027 Ω ± 2.5 mrad TAR 3.5 27.2 2.0 3.8 1.5 5.9 Accessory: 1m Test Leads Standard: 10 pF OSC Level Frequency 1 kHz 1 MHz 0.
Accessory: 2m Test Leads Standard: 10 pF OSC Level Frequency 1 kHz 1 MHz 0.5 V 3 MHz 10 MHz Parameter Test Limits Cp D Cp D Cp D Cp D ± 0.41 pF ± 0.041 ± 0.015 pF ± 0.0015 ± 0.045 pF ± 0.0045 ± 0.134 pF ± 0.0134 Test Measurement Result Uncertainty pF ± 0.0010 pF ± 0.0001 pF ± 0.0025 pF ± 0.0002 pF ± 0.0030 pF ± 0.0005 pF ± 0.015 pF ± 0.003 TAR 46.6 81.6 5.0 5.1 13.0 15.5 29.5 10.6 Accessory: 2m Test Leads Standard: 100 pF OSC Level Frequency 1 kHz 100 kHz 0.
Agilent 4294A Precision Impedance Analyzer Service Manual Third Edition Manufacturing No.
Notices The information contained in this document is subject to change without notice. This document contains proprietary information that is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Agilent Technologies. Microsoft®,MS-DOS®,Windows®,Visual C++®,Visual Basic®,VBA® and Excel® are registered UNIX is a registered trademark in U.S.
Safety Summary The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual may impair the protection provided by the equipment. In addition it violates safety standards of design, manufacture, and intended use of the instrument. The Agilent Technologies Company assumes no liability for the customer’s failure to comply with these requirements.
Safety Symbol General definitions of safety symbols used on the instrument or in manuals are listed below. Instruction Manual symbol: the product is marked with this symbol when it is necessary for the user to refer to the instrument manual. Alternating current. Direct current. On (Supply). Off (Supply). In position of push-button switch. Out position of push-button switch. Frame (or chassis) terminal. A connection to the frame (chassis) of the equipment which normally include all exposed metal structure.
Warranty This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period corresponding to the individual warranty periods of its component products. Instruments are warranted for a period of one year. Fixtures and adapters are warranted for a period of 90 days. During the warranty period, Agilent Technologies Company will, at its option, either repair or replace products that prove to be defective.
For any assistance, contact your nearest Agilent Technologies Sales and Service Office. Addresses are provided at the back of this manual. Typeface Conventions Bold Boldface type is used when a term is defined. For example: icons are symbols. Italic Italic type is used for emphasis and for titles of manuals and other publications. [Hardkey] Indicates a hardkey labeled “Hardkey.” Softkey Indicates a softkey labeled “Softkey.
Contents 1. General Information Organization of Service Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Instruments Covered by This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Require Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.
Contents Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Null Loop Phase Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Required Equipment . . . . . . . . . . . . . .
Contents 5. Power Supply Troubleshooting INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 START HERE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 1. Check the Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 2.
Contents Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Test Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 8. Theory of Operation OVERALL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents A4 Lc Amplifier Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 A5 IV Convertor & Lp Amplifier Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 A6 Vector Generator Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 A7 Synthesizer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents 12
1. General Information 1 General Information This Service Manual is a guide to servicing the 4294A Precision Impedance Analyzer. The Service Manual provides information about performance testing, adjusting, troubleshooting, and repairing the 4294A.
General Information Organization of Service Manual Organization of Service Manual This manual consists of the major chapters listed below. This section describes the names of the chapters and the content of each chapter. • Performance Test provides procedures for performance testing the 4294A. • Adjustment provides procedures for adjusting the 4294A after repair or replacement of an assembly. Most of the adjustments update the correction constants stored into the EEPROM on the A1 CPU.
Instruments Covered by This Manual Agilent Technologies uses a two-part, ten-character serial number label (See Figure 1-1) attached to the instrument’s rear panel. The first five characters are the serial prefix and the last five digits are the suffix. Figure 1-1 Serial Number Label An instrument manufactured after the printing date of this manual may have serial number prefix that is not listed on the title page.
General Information Require Equipment Require Equipment Table 1-1 lists the recommended equipment for performing maintenance on the 4294A. Table 1-1 Recommended Test Equipment Equipment Critical Specifications Recommended Model Qty. Use*1 Frequency Counter Frequency Range: 10 MHz, Time Base Error: ≤ ±1.
Table 1-1 Recommended Test Equipment Equipment Critical Specifications Recommended Model Qty. Use*1 Adapter 7 mm-N(m) Adapter 11525A 1 P Dual Banana-BNC(f) Adapter p/n 1251-2277 1 P,A N(m)-BNC(m) Adapter p/n 1250-0077 1 P,A BNC(f)-BNC(f) Adapter p/n 1250-1830 4 A BNC(m)-Banana(m) Adapter p/n 1250-1263 4 A 50 Ω termination 909C Opt.012 1 P,A Termination *1.P:Performance Test A:Adjustment *2.16048A/D cannot be used for a substitute. *3.furnished with the 4294A 1 17 1.
General Information Require Equipment 18 1
2. Performance Test 2 Performance Test This chapter contains the performance test for the 4294A Precision Impedance Analyzer. These performance tests are used to verify that the analyzer’s performance meets its specifications.
Performance Test Performance Test Performance Test Introduction This section provides the test procedures used to verify that the 4294A’s specifications are met. The performance tests can also be used for incoming inspection, and for verification after troubleshooting or adjustment. If the performance tests indicate that the 4294A is NOT operating within the specified limits, check your test setup, then proceed with troubleshooting if necessary.
Performance Test Performance Test Frequency Accuracy Test This test checks the frequency accuracy of the internal frequency reference with a frequency counter and a frequency standard. Specification Frequency Accuracy: ± 20 ppm at (23±5) ºC (without Option 1D5) ± 0.13 ppm at 0 ºC to 55 ºC (with Option 1D5) 2.
Performance Test Performance Test Figure 2-1 Frequency Accuracy Test Setup 2. Initialize the frequency counter. Then set the controls as follows. Gate Time: 1 sec. INT/EXT Switch (rear panel, 5334B only) EXT*1 *1.If the frequency standard is not connected, set the switch to INT. 3. Press [Preset] to initialize the 4294A. Then set the controls as follows. Setting Operation Frequency Span: 0 Hz [Span] - [0] - [×1] Center Frequency: 10 MHz [Center] - [1] - [0] - [M/m] OSC Level: 0.
Performance Test Performance Test OSC Level Accuracy Test This test checks the actual power level of the test signal at 10 MHz. Specification ±[(10 + 0.
Performance Test Performance Test Figure 2-2 OSC Level Accuracy Test Setup 1 2. Press Reset key (blue,⇒) to initialize the multimeter, then Set it as follows. a. Press [ACV] to set the measurement mode to AC voltage. b. Press S(blue - N Rdgs/Trig),⇓,⇓,⇓ to display SETACV. c. Press ⇒,⇓,⇓,⇓ to display SYNC, then press [Enter] d. Press [NPLC] - [1] - [0] - [0] - [Enter] 3. Press [Preset] to initialize the 4294A. Then set the controls as follows.
Performance Test Performance Test 7. Confirm that the monitor accuracy is within the monitor accuracy limit. NOTE If the monitor accuracy is beyond the limit, OSC Level Test fails. 8. Repeat from Step 4 to 7 for all OSC level and frequency setting in Table 2-1 Table 2-1 OSC Level Accuracy Test (Interface box) Settings 1 Frequency 1.0 V 1 kHz 2. Performance Test OSC Level 100 kHz 0.5 V 40 Hz 1 kHz 10 kHz 100 kHz 0.25 V 1 kHz 100 kHz 0.125 V 1 kHz 100 kHz 0.064 V 1 kHz 100 kHz 0.
Performance Test Performance Test Figure 2-3 OSC Level Accuracy Test Setup 2 12. Set the 4294A as follows. NOTE Setting Operation Center Frequency: 1 MHz [Center] - [1] - [M/μ] OSC Level: 0.75 V [Source] - LEVEL - [.] - [7] - [5] - [×1] The OSC level must be set to 0.75V because impedance mismatching occurs between the 4294A and the power sensor. The calculation sheet and the test record say the OSC level is 0.5 V. 13. Press [Trigger] - Single for a single sweep measurement: 14.
Performance Test Performance Test 16. Repeat from Step 13 to 15 for all frequency settings in Table 2-2 Table 2-2 OSC Level Accuracy Test (Interface box) Settings 2 Frequency 1 MHz 10 MHz 16 MHz 50 MHz 110 MHz 17. Disconnect the all test equipment from the 4294A, then connect the OPEN termination directly to the 4294A UNKNOWN terminals. 18. Press [Source] - LEVEL - [.] - [5] - [×1] to set the 4294A OSC level to 0.5 V. 19. Press [Trigger] - Single for a single sweep measurement: 20.
Performance Test Performance Test Figure 2-4 42942A Setup 25. Setup the 42942A as follows. a. Press [Cal],Adapter,7mm 42942A,SETUP. b. Connect the OPEN termination furnished with the 42942A to the 7mm connector. c. Press PHASE COMP to measure the phase compensation data. d. Press OPEN to measure the open compensation data. e. Connect the SHORT termination furnished with the 42942A instead of the OPEN termination. f. Press SHORT to measure the short compensation data. g.
Performance Test Performance Test Figure 2-5 OSC Level Accuracy Test Setup 3 2. Performance Test 27. Set the 4294A as follows. NOTE Setting Operation Center Frequency: 1 MHz [Center] - [1] - [M/m] OSC Level: 0.75 V [Source] - LEVEL - [.] - [7] - [5] - [×1] The OSC level must be set to 0.75V because a impedance mismatch occurs between the 4294A and the power sensor. 28. Press [Trigger] - Single for a single sweep measurement: 29. Record the following values according to the calculation sheet. a.
Performance Test Performance Test 31. Repeat from Step 28 to 30 for all frequency settings in Table 2-3 Table 2-3 OSC Level Accuracy Test (Interface box) Settings 3 Frequency 1 MHz 10 MHz 15 MHz 16 MHz 50 MHz 110 MHz 32. Disconnect the test equipment from the 7mm connect, then connect the OPEN termination to the 7mm connector. 33. Press [Source] - LEVEL - [.] - [5] - [×1] to set the 4294A OSC level to 0.5 V. 34. Press [Trigger] - Single for a single sweep measurement: 35.
Performance Test Performance Test DC Bias Monitor Accuracy Test This test checks the accuracy of the DC bias monitor. Specification Voltage Monitor Accuracy: ±[0.2 % + ( 5 + 0.3 × |Imon(mA)| ) mV] at (23 ± 5) ºC ±[1 % + ( 0.5 + |Vmon(mV)| / 10000) mA] 2.
Performance Test Performance Test b. Press [NPLC] - [1] - [0] - [0] - [Enter]. 3. Press [Preset] to initialize the 4294A, then set it as follows. Setting Operation Adapter: None [Cal] - ADAPTER - NONE OSC Level: 0 V*1 [Source] - [0] - [×1] DC Bias: On [Source] - BIAS MENU - BIAS DC Bias Mode: Voltage [Source] - BIAS MENU - MODE - VOLT DC Bias Monitor: Voltage [Display] - BIAS MON - VOLT DC Bias Level: 0 V [Source] - BIAS MENU - VOLTAGE LEVEL - [0] [×1] *1.
Performance Test Performance Test Figure 2-7 DC Bias Monitor Accuracy Test (current) Setup 2. Performance Test 9. Press Reset key (blue - ⇒) to initialize the multimeter, then Set it as follows. a. Press [DCI] to set the measurement mode to DC current. b. Press [NPLC] - [1] - [0] - [0] - [Enter]. 10. Press [Preset] to initialize the 4294A, then set it as follows.
Performance Test Performance Test 12. Press [Trigger] - Single for a single sweep measurement. 13. Record the multimeter reading and the DC Bias monitor reading, then record them on the calculation sheet. 14. Calculate the result according to the calculation sheet, then record it on the performance test record. 15.
Performance Test Performance Test DC Bias Level Accuracy Test This test checks the accuracy of the DC bias level at several level. Specification Voltage Monitor Accuracy: ±[0.1 % + (5 + 30 × |Imon(mA)| ) mV] at (23 ± 5) ºC ±[2 % + ( 0.2 + |Vmon(mV)| / 20) mA] 2.
Performance Test Performance Test Figure 2-8 DC Bias Level Accuracy Test (voltage) Setup 2. Press Reset key (blue - ⇒) to initialize the multimeter, then Set it as follows. a. Press [DCV] to set the measurement mode to DC voltage. b. Press [NPLC] - [1] - [0] - [0]. 3. Press [Preset] to initialize the 4294A, then set it as follows.
Performance Test Performance Test Table 2-6 DC Bias Monitor Accuracy Test (voltage) Setting Bias Level 0V 25 V 40 V 2. Performance Test –25 V –40 V 8. Disconnect the all test equipment from the 4294A, then connect the SHORT Termination to the 4294A UNKNOWN Terminal. 9. Press [Preset] to initialize the 4294A, then set it as follows.
Performance Test Performance Test Measurement Accuracy Test This test checks the DC bias level of the stimulus signal at several frequencies from 40 Hz to 110 MHz. Specification Measurement Accuracy: Basic Accuracy: 0.08% See the Specifications on Operation Manual for details.
Performance Test Performance Test Figure 2-9 Measurement Accuracy Test Setup (Accessory: None) 2. Performance Test 5. Press [Cal] - FIXTURE COMPEN - OPEN 6. Connect the SHORT termination instead of the OPEN termination 7. Press [Cal] - FIXTURE COMPEN - SHORT 8. Press [Meas] - more 1/3 - Cp-D to set the 4294A Measurement mode to Cp-D. 9. Create the sweep list shown in Figure 2-10. Segment 1 is added by the following procedure. a. Press [Sweep] - EDIT LIST - [ADD] to add a segment to the sweep list. b.
Performance Test Performance Test Figure 2-10 Sweep List for Measurement Accuracy Test c. Press done. 10. Press done to save the sweep list menu. 11. Press TYPE - LIST to set the sweep type to the list sweep. 12. Connect the 1 pF standard capacitor to the 4294A UNKNOWN Terminal as shown in Figure 2-9 on page 39. 13. Press [Trigger] - SINGLE to make a measurement. 14. Press [Copy] - SELECT CONTENTS - LIST VALUE to show the list as shown in Figure 2-11.
Performance Test Performance Test Figure 2-11 Measurement Value List 2. Performance Test 15. Record the 4294A reading on the calculation sheet for all setting in Table 2-8, then Calculate the test result.
Performance Test Performance Test Table 2-8 Measurement Accuracy Test(Accessory: None, Standard Capacitor) Setting Standard Capacitor OSC Level Frequency 1 pF 0.5 V 1 MHz 3 MHz 10 pF 0.5 V 1 kHz 1 MHz 3 MHz 10 MHz 100 pF 0.1 V 1 kHz 0.5 V 1 kHz 100 kHz 1 MHz 3 MHz 10 MHz 0.1 V 1 kHz 100 kHz 1 MHz 3 MHz 10 MHz 1000 pF 0.5 V 1 kHz 10 kHz 100 kHz 0.01 μF 0.1 V 1 kHz 0.5 V 120 Hz 1 kHz 10 kHz 0.1 μF 0.1 V 1 kHz 0.5 V 120 Hz 1 kHz 10 kHz 1 μF 0.1 V 1 kHz 0.5 V 120 Hz 1 kHz 0.
Performance Test Performance Test 16. Connect the 10 Ω standard resistor to the 4294A UNKNOWN Terminal as shown in Figure 2-9 on page 39. 17. Press [Meas] - R-X to set the measurement mode to R-X. 18. Press [Trigger] - SINGLE to make a measurement. 19. Record the 4294A reading on the calculation sheet for all setting in Table 2-9, then calculate the test result. Table 2-9 Standard Capacitor OSC Level Frequency 10 Ω 0.5 V 1 kHz 0.1 V 1 kHz 0.5 V 1 kHz 0.1 V 1 kHz 0.5 V 1 kHz 0.1 V 1 kHz 0.
Performance Test Performance Test 21. Press [Cal] - Adapter - 7mm 42942A to set the adapter to the 42942A. 22. Setup the 4294A as follows. NOTE If Setup is completed in OSC level accuracy test, this operation is not required. a. Press SETUP. b. Connect the OPEN termination furnished with the 42942A to the 7mm connector. c. Press PHASE COMP to measure the phase compensation data. d. Press OPEN to measure the open compensation data. e.
Performance Test Performance Test c. Gently inserts the airline center conductor into the open termination center conductor. Mate the outer conductors. Then tie the connection by the 136 N·cm torque. Figure 2-13 10cm Airline with OPEN Measurement Test Setup 2. Performance Test 29. Press [Trigger] - Single to make a measurement. 30. Record the 4294A reading on the calculation sheet for all setting in Table 2-11, then calculate the test result.
Performance Test Performance Test torque. (A 1/2 inch open end wrench may be necessary to hold the airline stationary.) Figure 2-14 10 cm Airline with SHORT Measurement Test Setup 32. Press [Trigger] - Single to make a measurement. 33. Record the 4294A reading on the calculation sheet for all setting in Table 2-11 on page 45, then calculate the test result. 34. Disconnect all the equipment from the 4294A, then perform the setup as follows a. Connect the 1m Test Leads to the 4294A UNKNOWN Terminal. b.
Performance Test Performance Test Figure 2-15 Connection for phase compensation 2. Performance Test d. Press PHASE COMP to measure the phase compensation data. e. Connect the 100 Ω Resistor’s all terminals to the test leads as shown in Figure 2-16. Figure 2-16 Connection for load compensation f. Press LOAD to measure the load compensation data. g. Press done to activate the compensation data.
Performance Test Performance Test Figure 2-17 Measurement Accuracy Test Setup (Accessory: 1m Test Leads) 35. Connect the OPEN Termination as shown in Figure 2-17. 36. Press [Cal] - FIXTURE COMPEN - OPEN. 37. Connect the SHORT termination instead of the OPEN termination. 38. Press [Cal] - FIXTURE COMPEN - SHORT. 39. Connect the 10 pF standard capacitor to the 4294A UNKNOWN Terminal as shown in Figure 2-17. 40. Press [Meas] - more 1/3 - Cp-D to set the 4294A Measurement mode to Cp-D. 41.
Performance Test Performance Test Table 2-12 Measurement Accuracy Test(Accesory:1m Test Leads, Standard Capacitor) Setting Standard Capacitor OSC Level Frequency 10 pF 0.5 V 1 kHz 1 MHz 2. Performance Test 3 MHz 10 MHz 100 pF 0.5 V 1 kHz 100 kHz 1 MHz 3 MHz 10 MHz 43. Connect the 1 Ω standard resistor as shown in Figure 2-17. 44. Press [Meas] - R-X to set the measurement mode to R-X. 45. Press [Trigger] - Single to make a measurement. 46.
Performance Test Performance Test Figure 2-18 Measurement Accuracy Test Setup (Accessory: 2m Test Leads) 49. Press [Cal] - FIXTURE COMPEN - OPEN 50. Connect the SHORT termination instead of the OPEN termination 51. Press [Cal] - FIXTURE COMPEN - SHORT 52. Connect the 10 pF standard capacitor to the 4294A UNKNOWN Terminal as shown in Figure 2-18. 53. Press [Meas] - more 1/3 - Cp-D to set the 4294A Measurement mode to Cp-D. 54. Press [Trigger] - Single to make a measurement. 55.
Performance Test Performance Test Table 2-14 Measurement Accuracy Test(Accesory:2m Test Leads, Standard Capacitor) Setting Standard Capacitor OSC Level Frequency 10 pF 0.5 V 1 kHz 1 MHz 2. Performance Test 3 MHz 10 MHz 100 pF 0.5 V 1 kHz 100 kHz 1 MHz 3 MHz 10 MHz 56. Connect the Standard resistor as shown in Figure 2-18. 57. Press [Meas] - R-X to set the measurement mode to R-X. 58. Press [Trigger] - Single to make a measurement. 59.
Performance Test Calculation Sheet Calculation Sheet OSC Level Accuracy Test OSC Level Accuracy(Accessory: Nothing, 40 Hz to 100 kHz) OSC Level [a] Freq. 1.0 V 1 kHz V V V ± 0.1001 V V mV 100 kHz V V V ± 0.1001 V V mV 40 Hz V V V ± 0.0500 V V mV 1 kHz V V V ± 0.0500 V V mV 10 kHz V V V ± 0.0500 V V mV 100 kHz V V V ± 0.0500 V V mV 1 kHz V V V ± 0.0250 V V mV 100 kHz V V V ± 0.0250 V V mV 1 kHz V V V ± 0.0125 V V mV 100 kHz V V V ± 0.
Performance Test Calculation Sheet OSC Level Accuracy (Accessory: Nothing, 1 MHz to 110 MHz) OSC Level [a] 0.5 V Freq. Monitor Reading [b] Power Meter Reading [c] Calculated OSC level [d] Monitor Accuracy [b–d] Monitor Accuracy Limit OPEN Reading [e] Test Result [e×d/b–a] = 2 50 × c V W V V ± 0.0904 V V mV 10 MHz V W V V ± 0.0938 V V mV 15 MHz V W V V ± 0.0956 V V mV 16 MHz V W V V ± 0.0960 V V mV 50 MHz V W V V ± 0.1088 V V mV 110 MHz V W V V ± 0.
Performance Test Calculation Sheet DC Bias Monitor Accuracy Test DC Bias Monitor Accuracy Test (voltage) Bias Level Monitor Reading [a] Multimeter Reading [b] Test Result [b–a] 0V V V V 25 V V V V 40 V V V V –25 V V V V –40 V V V V DC Bias Monitor Accuracy Bias Level [a] DC Bias Setting 1 [b] Multimeter Reading 1 [c] DC Bias Setting 2 [d]=a×b/c 0 mA 0V –––––––––– –––––––––– mA mA mA 20 mA 0.5 V mA V mA mA mA 100 mA 2.5 V mA V mA mA mA –20 mA –0.
Performance Test Calculation Sheet DC Bias Level Accuracy Test DC Bias Level Accuracy Test (voltage) Bias Level [a] Multimeter Reading [b] Test Result Equation [b–a] V V 25 V V V 40 V V V –25 V V V –40 V V V DC Bias Level Accuracy Test (current) Bias Level [a] Cal Factor*1 [b] Monitor Reading [c] Test Result [b×c–a] 0 mA mA mA 20 mA mA mA 100 mA mA mA –20 mA mA mA –100 mA mA mA *1.Calculate f/e in DC Bias Monitor Accuracy Test Calculation Sheet 2 55 2.
Performance Test Calculation Sheet Measurement Accuracy Test Standard Calibration Values (16380A/C,42030A) Standard Frequency Parameter 1 pF 1 MHz Cp Calibration Value Reference Designation pF D 3 MHz Cp CV2 pF D 10 pF 1 kHz Cp Cp pF Cp pF Cp pF 1 kHz Cp pF Cp pF Cp pF Cp pF 1 kHz Cp D 56 CV17 CV18 pF D 1000 pF CV15 CV16 D 10 MHz CV13 CV14 D 3 MHz CV11 CV12 D 1 MHz CV9 CV10 D 100 pF CV7 CV8 D 10 MHz CV5 CV6 D 3 MHz CV3 CV4 D 1 MHz CV1 CV19 CV20 pF CV21 CV
Performance Test Calculation Sheet Standard Frequency Parameter 0.01 μF 120 Hz Cp Calibration Value Reference Designation nF D 1 kHz Cp CV24 nF D Cp CV26 nF D 0.1 μF 120 Hz Cp Cp nF Cp nF 120 Hz Cp nF Cp CV33 CV34 μF D 1 kHz CV31 CV32 D 1 μF CV29 CV30 D 10 kHz CV27 CV28 D 1 kHz CV25 CV35 CV36 μF D CV37 CV38 10 Ω DC R Ω CV39 1Ω DC R Ω CV40 100 mΩ DC R mΩ CV41 10 mΩ DC R mΩ CV42 2 2.
Performance Test Calculation Sheet Standard Calibration Values (16190A) Table 2-16 Standard Calibration Value Standard Frequency Parameter 50 Ω DC R Ω CV43 1 MHz |Z| Ω CV44 θ mrad CV45 |Z| Ω CV46 θ mrad CV47 |Z| Ω CV48 θ mrad CV49 |Z| Ω CV50 θ rad CV51 |Z| Ω CV52 θ rad CV53 |Z| Ω CV54 θ rad CV55 |Z| Ω CV56 θ rad CV57 |Z| Ω CV58 θ rad CV59 |Z| Ω CV60 θ rad CV61 10 MHz 100 MHz Airline with 1 MHz OPEN 10 MHz 100 MHz Airline with 1 MHz SH
Performance Test Calculation Sheet Measurement Accuracy Test Accessory: Nothing Standard: 1 pF OSC Level Frequency Parameter 0.5 V 1 MHz Cp 4294A reading [a] pF 3 MHz Cp a – CV2 pF D Accessory: Nothing Standard: 10 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp Cp 4294A reading [a] pF Cp pF Cp pF 1 kHz Cp D 2 a – CV7 a – CV9 a – CV10 pF D 0.1 V a – CV5 a – CV8 D 10 MHz Test Result Equation a – CV6 D 3 MHz a – CV3 a – CV4 D 1 MHz a – CV1 2.
Performance Test Calculation Sheet Accessory: Nothing Standard: 100 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp 4294A reading [a] pF D 100 kHz Cp Cp pF Cp pF Cp pF 1 kHz Cp pF Cp pF Cp pF Cp pF Cp D 60 a – CV15 a – CV16 pF D 10 MHz a – CV13 a – CV14 D 3 MHz a – CV13 a – CV14 D 1 MHz a – CV19 a – CV20 D 100 kHz a – CV17 a – CV18 D 0.
Performance Test Calculation Sheet Accessory: Nothing Standard: 1000 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp 4294A reading [a] pF D Cp a – CV22 pF D 100 kHz Cp 1 kHz Cp pF Nothing Standard: 0.01 μF OSC Level Frequency Parameter 0.5 V 120 Hz Cp pF Cp 4294A reading [a] nF Cp nF 1 kHz Cp D 2 a – CV23 a – CV25 a – CV26 nF D 0.1 V Test Result Equation a – CV24 D 10 kHz a – CV21 a – CV22 D 1 kHz a – CV21 a – CV22 D Accessory: a – CV21 a – CV22 D 0.
Performance Test Calculation Sheet Accessory: Nothing Standard: 0.1 μF OSC Level Frequency Parameter 0.5 V 120 Hz Cp 4294A reading [a] nF D 1 kHz Cp Cp nF 1 kHz Cp nF Nothing Standard: 1 μF OSC Level Frequency Parameter 0.5 V 120 Hz Cp nF Cp 4294A reading [a] μF 1 kHz Cp Test Result Equation a – CV35 a – CV36 μF D 0.1 V a – CV31 a – CV32 D 1 kHz a – CV33 a – CV34 D Accessory: a – CV31 a – CV32 D 0.
Performance Test Calculation Sheet Accessory: Nothing Standard: 1Ω OSC Level Frequency Parameter 0.5 V 1 kHz R Ω a – CV40 0.1 V 1 kHz R Ω a – CV40 Nothing Standard: 100 mΩ OSC Level Frequency Parameter 0.5 V 1 kHz R mΩ a – CV41 0.1 V 1 kHz R mΩ a – CV41 Accessory: Nothing Standard: 10 mΩ 4294A reading [a] Test Result Equation 4294A reading [a] Test Result Equation OSC Level Frequency Parameter 0.5 V 1 kHz R mΩ a – CV42 0.
Performance Test Calculation Sheet Accessory: 42942A Terminal Adapter Standard: OPEN OSC Level Frequency Parameter 0.5 V 1 MHz |Z| Ω a – CV50 θ rad a – CV51 |Z| Ω a – CV52 θ rad a – CV53 |Z| Ω a – CV54 θ rad a – CV55 10 MHz 100 MHz Accessory: 42942A Terminal Adapter Standard: SHORT 4294A reading [a] OSC Level Frequency Parameter 0.
Performance Test Calculation Sheet Accessory: 1m Test Leads Standard: 100 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp 4294A reading [a] pF D Cp a – CV14 pF D 1 MHz Cp Cp pF Cp pF 1m Test Leads Standard: 1Ω OSC Level Frequency Parameter 0.5 V 1 kHz R Accessory: 1m Test Leads Standard: 100 mΩ OSC Level Frequency Parameter 0.5 V 1 kHz R 2 a – CV17 a – CV18 pF D Accessory: a – CV15 a – CV16 D 10 MHz a – CV13 a – CV14 D 3 MHz a – CV13 2.
Performance Test Calculation Sheet Accessory: 2m Test Leads Standard: 10 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp 4294A reading [a] pF D 1 MHz Cp Cp pF Cp pF 2m Test Leads Standard: 100 pF OSC Level Frequency Parameter 0.5 V 1 kHz Cp pF Cp 4294A reading [a] pF Cp pF Cp pF Cp pF 2m Test Leads Standard: 1Ω OSC Level Frequency Parameter 0.
Performance Test Calculation Sheet Accessory: 2m Test Leads Standard: 100 mΩ OSC Level Frequency Parameter 0.5 V 1 kHz R 4294A reading [a] mΩ Test Result Equation a – CV41 2.
Performance Test Performance Test Record Performance Test Record Agilent Technologies 4294A Precision Impedance Analyzer Serial Number: Temperature: Humidity: Options: ºC %RH Date: Tested by: Frequency Accuracy Test Without Option 1D5 Frequency Test Limit 10 MHz ±200 Hz Test Result Measurement Uncertainty Hz ±2.2 Hz With Option 1D5 Frequency Test Limit 10 MHz ±1.3 Hz 68 Test Result Measurement Uncertainty Hz ±0.
Performance Test Performance Test Record OSC Level Accuracy Test OSC Level Accuracy (Accessory: Nothing) Frequency Test Limit 1.0 V 1 kHz ±101 mV mV ±0.2 mV 100 kHz ±101 mV mV ±0.8 mV 40 Hz ±51.0 mV mV ±0.06 mV 1 kHz ±51.0 mV mV ±0.09 mV 10 kHz ±51.0 mV mV ±0.09 mV 100 kHz ±51.0 mV mV ±0.42 mV 1 MHz ±51.3 mV mV ±5.2 mV 10 MHz ±53.5 mV mV ±5.3 mV 15 MHz ±54.8 mV mV ±5.3 mV 16 MHz ±55.0 mV mV ±5.3 mV 50 MHz ±63.5 mV mV ±5.4 mV 110 MHz ±78.5 mV mV ±5.
Performance Test Performance Test Record OSC Level Accuracy (with 42942A Terminal Adapter) OSC Level Frequency Test Limit Test Result Measurement Uncertainty 0.5 V 1 MHz ±51.3 mV mV ±5.2 mV 10 MHz ±53.5 mV mV ±5.3 mV 15 MHz ±54.8 mV mV ±5.3 mV 16 MHz ±55.0 mV mV ±5.3 mV 50 MHz ±63.5 mV mV ±5.4 mV 110 MHz ±78.5 mV mV ±5.7 mV DC Bias Monitor Accuracy Test Bias Level Test Limit 0V ±5.0 mV mV ±0.001 mV 25 V ±55.0 mV mV ±0.61 mV 40 V ±85.0 mV mV ±0.86 mV –25 V ±55.
Performance Test Performance Test Record DC Bias Level Accuracy Test Test Limit 0V ±5.0 mV mV ±0.001 mV 25 V ±30.3 mV mV ±0.61 mV 40 V ±45.6 mV mV ±0.86 mV –25 V ±30.3 mV mV ±0.61 mV –40 V ±45.6 mV mV ±0.86 mV 0 mA ±0.20 mA mA ±0.001 mA 20 mA ±0.60 mA mA ±0.004 mA 100 mA ±2.20 mA mA ±0.016 mA –20 mA ±0.60 mA mA ±0.004 mA –100 mA ±2.20 mA mA ±0.016 mA 2 Test Result Measurement Uncertainty 2.
Performance Test Performance Test Record Measurement Accuracy Test Accessory: Nothing Standard: 1 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 MHz Cp ±0.0015 pF D ±0.0015 Cp ±0.0057 pF D ±0.0057 3 MHz Accessory: Nothing Standard: 10 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.41 pF D ±0.041 Cp ±0.0083 pF D ±0.0008 Cp ±0.033 pF D ±0.0033 Cp ±0.101 pF D ±0.0101 Cp ±2.00 pF D ±0.200 1 MHz 3 MHz 10 MHz 0.
Performance Test Performance Test Record Accessory: Nothing Standard: 100 pF Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.47 pF D ±0.0047 Cp ±0.079 pF D ±0.0008 Cp ±0.076 pF D ±0.0008 Cp ±0.30 pF D ±0.0030 Cp ±1.00 pF D ±0.0100 Cp ±2.07 pF D ±0.0207 Cp ±0.102 pF D ±0.0010 Cp ±0.087 pF D ±0.0009 Cp ±0.32 pF D ±0.0032 Cp ±1.01 pF D ±0.0101 100 kHz 1 MHz 3 MHz 10 MHz 0.
Performance Test Performance Test Record Accessory: Nothing Standard: 1000 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±1.15 pF D ±0.0012 Cp ±0.79 pF D ±0.0008 Cp ±0.76 pF D ±0.0008 Cp ±2.8 pF D ±0.0028 10 kHz 100 kHz 0.1 V 1 kHz Accessory: Nothing Standard: 0.01 μF OSC Level Frequency Parameter Test Limit 0.5 V 120 Hz Cp ±0.033 nF D ±0.0033 Cp ±0.0079 nF D ±0.0008 Cp ±0.0076 nF D ±0.0008 Cp ±0.0102 nF D ±0.0010 1 kHz 10 kHz 0.
Performance Test Performance Test Record Accessory: Nothing Standard: 0.1 μF Frequency Parameter Test Limit 0.5 V 120 Hz Cp ±0.30 nF D ±0.0030 Cp ±0.076 nF D ±0.0008 Cp ±0.077 nF D ±0.0008 Cp ±0.085 nF D ±0.0008 1 kHz 10 kHz 0.1 V 1 kHz Accessory: Nothing Standard: 1 μF OSC Level Frequency Parameter Test Limit 0.5 V 120 Hz Cp ±0.0030 μF D ±0.0030 Cp ±0.00077 μF D ±0.0008 Cp ±0.00085 μF D ±0.0008 1 kHz 0.
Performance Test Performance Test Record Accessory: Nothing Standard: 10 Ω OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz R ±0.0100 Ω Ω ±0.003 Ω 0.1 V 1 kHz R ±0.0114 Ω Ω ±0.003 Ω Accessory: Nothing Standard: 1Ω Test Result Measurement Uncertainty OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz R ±0.0033 Ω Ω ±0.001 Ω 0.1 V 1 kHz R ±0.0040 Ω Ω ±0.
Performance Test Performance Test Record Accessory: Standard: 42942A Terminal Adapter 50 Ω Frequency Parameter Test Limit 0.5 V 1 kHz |Z| ±0.31 Ω Ω ±0.090 Ω θ ±6.1 mrad mrad ±1.8 mrad |Z| ±0.31 Ω Ω ±0.090 Ω θ ±6.1 mrad mrad ±1.8 mrad |Z| ±0.31 Ω Ω ±0.090 Ω θ ±6.2 mrad mrad ±1.8 mrad |Z| ±0.54 Ω Ω ±0.010 Ω θ ±10.9 mrad mrad ±2.
Performance Test Performance Test Record Accessory: 1m Test Leads Standard: 10 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.41 pF D ±0.041 Cp ±0.013 pF D ±0.0013 Cp ±0.041 pF D ±0.0041 Cp ±0.124 pF D ±0.0124 1 MHz 3 MHz 10 MHz Accessory: 1m Test Leads Standard: 100 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.49 pF D ±0.0049 Cp ±0.102 pF D ±0.0010 Cp ±0.128 pF D ±0.0013 Cp ±0.38 pF D ±0.0038 Cp ±1.22 pF D ±0.
Performance Test Performance Test Record Accessory: 1m Test Leads Standard: 1Ω OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz R ±0.0055 Ω 1m Test Leads Standard: 100 mΩ OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz R ±4.6 mΩ Accessory: 2m Test Leads Standard: 10 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.41 pF D ±0.041 Cp ±0.015 pF D ±0.0015 Cp ±0.045 pF D ±0.0045 Cp ±0.134 pF D ±0.
Performance Test Performance Test Record Accessory: 2m Test Leads Standard: 100 pF OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz Cp ±0.49 pF D ±0.0049 Cp ±0.104 pF D ±0.0010 Cp ±0.128 pF D ±0.0013 Cp ±0.42 pF D ±0.0042 Cp ±1.33 pF D ±0.0133 100 kHz 1 MHz 3 MHz 10 MHz Accessory: 2m Test Leads Standard: 1Ω OSC Level Frequency Parameter Test Limit 0.5 V 1 kHz R ±0.
1. Chapter Title 2. Chapter Title 3. Adjustment 4. Chapter Title 3 Adjustment 81 5. Chapter Title This Chapter describes the Adjustment procedures requires procedures required to ensure that the 4294A Precision Impedance Analyzer is within its specifications.
Adjustment Safety Considerations Safety Considerations This manual contains NOTEs, CAUTIONs, and WARNINGs that must be followed to ensure the safety of the operator and to keep the instrument in a safe and serviceable condition. The Adjustment must be performed by qualified service personnel. WARNING Any interruption of the protective ground conductor (inside or outside the analyzer) or disconnection of the protective ground terminal can make the can make the instrument dangerous.
Order of Adjustment 1. Chapter Title Adjustment Order of Adjustment When performing more than one Adjustment, perform them in the order they appear in this chapter. The procedures are presented in the following order. • Perform this adjustment only when the EEPROM is replaced. To perform it, select the WRITE_ID on the adjustment program. • CAUTION Initialize Correction Constant Perform this adjustment only when the EEPROM is replaced. To perform it, the Init_CC on the adjsutment program.
Adjustment Preparation for using the Adjustment Program Preparation for using the Adjustment Program To use the Adjustment Program, some preparation is required. This section describes how to its procedure. Installing an GPIB Card (82340, 82341 or 82350) Install an GPIB Card into your computer (see the GPIB Card manual). The select code of the GPIB Card should be set to “7”. Installing HP VEE for Personal Computer Install the HP VEE into your computer (see the HP VEE for Windows®).
Figure 3-1 Adjustment Hardware Setup 1. Chapter Title Adjustment Preparation for using the Adjustment Program 2. Chapter Title 3. Adjustment 4. Chapter Title 5.
Adjustment Running the Adjustment Program Running the Adjustment Program 1. Start the HP VEE. 2. Load the adjustment program file into the HP VEE as follows. a. Pull down the File menu from the HP VEE window and select Open. b. Select the file C:\ADJ4294A\ADJ4294A.VEE and click Open. 3. You may be asked to add drivers for the equipment during the program loading. Click OK and enter the GPIB address for each equipment. Enter 0 as the address for the equipment which are not used for the adjustment.
Frequency Accuracy Correction Constants 1. Chapter Title Adjustment Frequency Accuracy Correction Constants The purpose of this procedure is to adjust the signal frequency accuracy. Required Equipment Recommended Model Frequency Counter 53181A or 5334B BNC(m)-BNC(m) Cable, 61 cm p/n 04294-61001 Dual Banana-BNC(f) Adapter p/n 1251-2277 2. Chapter Title Description Procedure 1. Run the adjustment program. 2. Choose the Adj_FreqAccy. 3. Connect the equipment as shown in Figure 3-2.
Adjustment Image Rejection Correction Constants Image Rejection Correction Constants The purpose of this procedure is to generate the correction constants that are used to adjust the Vector Ratio Detector. Required Equipment None Procedure 1. Run the adjustment program. 2. Choose the Adj_ImageRej. 3. Confirm nothing is connected to the 4294A UNKOWN terminal. 4. Follow the adjustment program instruction to update the correction constants.
LPOT-Mixer Offset Correction Constants 1. Chapter Title Adjustment LPOT-Mixer Offset Correction Constants The purpose of this procedure is to adjust the LPOT-Mixer Offset. Required Equipment None 2. Chapter Title Procedure 1. Run the adjustment program. 2. Choose the Adj_LpMix_Leak. 3. Confirm nothing is connected to the 4294A UNKOWN terminal. 4. Follow the adjustment program instruction to update the correction constants. 3. Adjustment 4. Chapter Title 5.
Adjustment Null Detector Offset Correction Constants Null Detector Offset Correction Constants The purpose of this procedure is to adjust the Null Detector Offset. Required Equipment Description Recommended Model 4TP OPEN termination 42090A Procedure 1. Run the adjustment program. 2. Choose the Adj_NullOffset. 3. Connect the OPEN termination as shown in Figure 3-3 Figure 3-3 Null Detector Offset Correction Constants Setup 4.
Null Loop Phase Correction Constants 1. Chapter Title Adjustment Null Loop Phase Correction Constants The purpose of this procedure is to adjust the phase of the null loop. Required Equipment Recommended Model 4TP OPEN termination 42090A 2. Chapter Title Description Procedure 1. Run the adjustment program. 2. Choose the Adj_NullPhase. 3. Connect the OPEN termination as shown in Figure 3-4 Figure 3-4 Null Loop Correction Constants Setup 3. Adjustment 4. Chapter Title 4.
Adjustment HPOT-Amplifier Offset Correction Constants HPOT-Amplifier Offset Correction Constants The purpose of this procedure is to adjust the HPOT-amplifier offset. Required Equipment Description Recommended Model 4TP OPEN termination 42090A Procedure 1. Run the adjustment program. 2. Choose the Adj_HpAmp_Ofst. 3. Connect the OPEN termination as shown in Figure 3-6 Figure 3-5 Relative Impedance Correction Constants Setup 4.
Relative Impedance Correction Constants 1. Chapter Title Adjustment Relative Impedance Correction Constants The purpose of this procedure is to adjust the relative impedance between the range resistors. Required Equipment Recommended Model 4TP OPEN termination 42090A 2. Chapter Title Description Procedure 1. Run the adjustment program. 2. Choose the Adj_Relative_Z. 3. Connect the OPEN termination as shown in Figure 3-6 Figure 3-6 Relative Impedance Correction Constants Setup 3. Adjustment 4.
Adjustment DC Bias Monitor Correction Constants DC Bias Monitor Correction Constants The purpose of this procedure is to adjust the DC Bias Monitor. Required Equipment Description Recommended Model Multimeter 3458A Inter face Box p/n 04294-61002 100 Ω resistor p/n 04294-61001*1 BNC(m)-BNC(m) Cable, 61 cm p/n 8120-1839 Dual Banana-BNC(f) Adapter p/n 1251-2277 *1.An attachment to the 4294A Procedure 1. Run the adjustment program. 2. Choose the Adj_DC_MON. 3.
Figure 3-8 Figure 3-8 DC Bias Monitor Correction Constants Setup 2 1. Chapter Title Adjustment DC Bias Monitor Correction Constants 2. Chapter Title 3. Adjustment 6. Click OK, then wait till the measurement finish. 7. Disconnect the dual banana plug from the multimeter, then connect it as shown in Figure 3-9 Figure 3-9 DC Bias Monitor Correction Constants Setup 3 4. Chapter Title 5. Chapter Title 8. Follow the adjustment program instruction to update the correction constants.
Adjustment DC Bias Level Correction Constants DC Bias Level Correction Constants The purpose of this procedure is to adjust the DC bias level. Required Equipment Description Recommended Model Multimeter 3458A Inter face Box p/n 04294-61002 100 Ω resistor p/n 04294-61001*1 BNC(m)-BNC(m) Cable, 61 cm p/n 8120-1839 Dual Banana-BNC(f) Adapter p/n 1251-2277 *1.An attachment to the 4294A Procedure 1. Run the adjustment program. 2. Choose the Adj_DC_BIAS. 3.
OSC Level Monitor Correction Constants 1. Chapter Title Adjustment OSC Level Monitor Correction Constants The purpose of this procedure is to adjust the OSC level monitor. Required Equipment Multimeter 3458A Interface Box p/n 04294-61002 BNC(m)-BNC(m) Cable, 61 cm p/n 8120-1839 Dual Banana-BNC(f) Adapter p/n 1251-2277 Power Meter 437B, 438A, E4418A/B, or E4419A/B Power Sensor 8482A Power Splitter 11667A 50 Ω termination, N(m) 909C Opt.012 3. Adjustment Recommended Model 2.
Adjustment OSC Level Monitor Correction Constants Figure 3-11 OSC Level Monitor Correction Constants Setup 1 4. Click OK, then wait till the measurement finish. 5. Disconnect equipment from the 4294A, then connect the equipment as shown in Figure 3-12. Figure 3-12 OSC Level Monitor Correction Constants Setup 2 6. Follow the adjustment program instruction to update the correction constants.
OSC Level Correction Constants 1. Chapter Title Adjustment OSC Level Correction Constants The purpose of this procedure is to adjust the output oscillation level. Required Equipment Recommended Model 4TP OPEN termination 42090A 2. Chapter Title Description Procedure 1. Run the adjustment program. 2. Choose the Adj_OSC_LEVEL. 3. Connect the equipment as shown in Figure 3-13 Figure 3-13 OSC Level Correction Constants Setup 3. Adjustment 4. Chapter Title 4.
Adjustment Impedance Measurement Correction Constants Impedance Measurement Correction Constants The purpose of this procedure is to adjust the relative impedance between the range resistors. Required Equipment Description Recommended Model Multimeter 3458A 100 Ω resistor p/n 04294-61001 Banana(m)-Banana(m) Cable 11058A, 2ea BNC(f)-BNC(f) Adapter p/n 1250-1830, 4ea BNC(m)-Banana(f) Adapter p/n 1250-1263, 4ea Procedure 1. Run the adjustment program. 2. Choose the Adj_4TP_LOAD. 3.
Figure 3-14 Impedance Measurement Correction Constants Setup 1 1. Chapter Title Adjustment Impedance Measurement Correction Constants 2. Chapter Title 3. Adjustment 4. Click OK, then wait till the measurement finish. 5. Connect the 100 Ω Resistor as shown in Figure 3-15. 4. Chapter Title 5.
Adjustment Impedance Measurement Correction Constants Figure 3-15 Impedance Measurement Correction Constants Setup 2 6. Follow the adjustment program instruction to update the correction constants.
Frequency Reference Adjustment (Opt.1D5 only) 1. Chapter Title Adjustment Frequency Reference Adjustment (Opt.1D5 only) The purpose of this procedure is to adjust the signal frequency accuracy. NOTE The adjustment program doesn’t include this adjustment. Perform this by manual operation. 2.
Adjustment Frequency Reference Adjustment (Opt.1D5 only) 2. Adjust “TIME BASE ADJ” on the rear panel so that the counter reading is 10 MHz ± 0.1 Hz.
4. Troubleshooting 4 Troubleshooting This chapter describes troubleshooting flow and provides the procedure to determine which group or assembly is faulty and should be checked.
Troubleshooting TROUBLESHOOTING SUMMARY TROUBLESHOOTING SUMMARY The troubleshooting strategy of this manual is based on a verification (rather than symptomatic) approach. This chapter describes typical troubleshooting procedure step by step and you can identify a faulty assembly or a faulty group by following the troubleshooting steps sequentially. Figure 4-1 diagrams the troubleshooting organization.
Troubleshooting TROUBLESHOOTING SUMMARY Figure 4-1 Troubleshooting Organization 4.
Troubleshooting START HERE START HERE This chapter contains the following troubleshooting procedures. By performing them in the order listed below, you can identify the faulty assembly or the faulty group efficiently. 1. Disconnect everything from the 4294A: All GPIB cable, printer cable, and accessory. 2. Perform the INSPECT THE POWER-ON SEQUENCE in this chapter. 3. Perform the INSPECT THE REAR PANEL FEATURE in this chapter. 4. Perform the INTERNAL TESTS FAILURE TROUBLESHOOTING in this chapter. 5.
Troubleshooting INSPECT THE POWER ON SEQUENCE INSPECT THE POWER ON SEQUENCE Check the Fan Turn the analyzer power on. Inspect the fan on the rear panel. • The fan should be rotating and audible. If case of unexpected results, check AC line power to the analyzer. Check the fuse (rating listed on the rear panel). Check the line voltage setting. For setting the line voltage, see the Power Requirements in Appendix B. If the problem persists, continue with the Power Supply Troubleshooting chapter.
Troubleshooting INSPECT THE REAR PANEL FEATURE INSPECT THE REAR PANEL FEATURE If the 4294A is operating unexpectedly after these checks are verified, continue with Digital Control Troubleshooting chapter. Check the GPIB Interface If the unexpected operations appear when controlling the analyzer with an external controller, perform the following checks to verify the problem is not with the controller.
Troubleshooting Internal Tests Failure Troubleshooting Internal Tests Failure Troubleshooting Check the Power-On Selftest The analyzer performs the power-on selftest every time the analyzer is turned on. In the power-on selftest, internal tests 5 through 16 are executed sequentially. The first failed test indicates the most probable faulty assembly and should be replaced. For more information about the internal tests, see Chapter 7.
Troubleshooting Internal Tests Failure Troubleshooting Table 4-1 Troubleshooting Information for Internal Test Failure Test No.
Troubleshooting External Tests Failure Troubleshooting External Tests Failure Troubleshooting If you can't identify the faulty assembly using the internal tests, you can execute the external tests in addition to the internal tests. These external tests are also built-in tests and 9 tests are available in the HP 4294A diagnostic test mode. Refer to Table 4-2 to know which assembly is probably faulty and should be replaced. For more information about the external tests, see Chapter 7.
Troubleshooting External Tests Failure Troubleshooting Table 4-2 Troubleshooting Information for External Test Failure Test No. First Failed Test Probable Faulty Assembly A1 17 FRONT PANEL † 18 FLOPPY DISK DRIVE † 19 24bit IO 20 ALL ANALOG*1 21 A8 IF 22 A3 VCH and A8 FRONTEND 23 A2 ATT 24 A5 NULL FRONTEND 25 A4/5/6 NULL 26 A3 ICH and A4 A51 A30 A53 A2 A7 A3 A4 A5 A6 A8 ††† ††† ††† ††† ††† †† ††† ††† †† †† †† †† *1. It consists of the external tests 21 through 26.
Troubleshooting Performance Tests Failure Troubleshooting Performance Tests Failure Troubleshooting Perform the following procedure sequentially when any performance tests fail. Perform Adjustments and Correction Constants Table 4-3 gives the recommended adjustments and correction constants when a performance test fails. If a performance test fails, you should perform the corresponding adjustments or correction constants function as shown in Table 4-3.
Troubleshooting Performance Tests Failure Troubleshooting Table 4-4 Troubleshooting Information for Performance Test Failure 2 Test No.
5 Power Supply Troubleshooting 117 5. Power Supply Troubleshooting This chapter describes troubleshooting procedures to isolate the faulty assembly within the power supply functional group.
Power Supply Troubleshooting INTRODUCTION INTRODUCTION Use this procedure only if you have read Troubleshooting, and you believe the problem is in the power supply. The procedure is designed to let you identify the bad assembly within the power supply functional group in the shortest possible time.
Power Supply Troubleshooting INTRODUCTION Figure 5-1 Power Supply Lines Simplified Block Diagram 5.
Power Supply Troubleshooting START HERE START HERE 1. Check the Fan Look at the fan on the rear panel. Check that the fan is rotating. • If the fan is not rotating, continue with the FIND OUT WHY THE FAN IS NOT ROTATING section in this chapter. • If the fan is rotating, continue with Check the A50 SHUTDOWN LED. 2.Check the A50 SHUTDOWN LED There is a LED, SHUTDOWN LED, on the A50 DC-DC Converter. Perform the following procedure to check it. The SHUTDOWN LED is described in the next A50 SHUTDOWN LED. 1.
Power Supply Troubleshooting START HERE A50 Shutdown LED The A50 SHUTDOWN LED turning off indicates some of A50 power supply is shut down by the A50 shutdown circuitry. There are two FAN conditions, rotating and not rotating when the SHUTDOWN LED turns off. When the fan is rotating, the shutdown circuit is probably activated by the over current condition on the power lines in the A50 DC-DC Converter.
Power Supply Troubleshooting START HERE Figure 5-3 A1 +5 VD LED Location Measure the A1 +5 VD Voltage Measure the DC voltage on a test point A1TP4 (+5 V) using a voltmeter. Check that the voltmeter reading is within 4.6 V to 5.4 V. • If the voltmeter reading is not within these limits, continue with the FIND OUT WHY THE A1 LED IS NOT ON STEADILY section. • If the voltmeter reading is within these limits, the +5 VD power supply is verified. 5. Check the A9 Two LEDs 1.
Power Supply Troubleshooting START HERE Figure 5-4 A9 Two LEDs Location Disconnect Wire from A3 P11 Turn the analyzer power off. Disconnect the wire from the A3 P11 and turn the analyzer power on. The A3 P11 location is shown in Figure 5-5. • If the one or two LEDs are still off, continue with the next step, Disconnect RF cable “M” from A2. • If the two LEDs go on, replace the A3 assembly. Disconnect RF cable “M” from A2 Hc Amp assembly Turn the analyzer power off.
Power Supply Troubleshooting START HERE Figure 5-5 A3 P11 and RF Cable “M” location 124 5
Power Supply Troubleshooting FIND OUT WHY THE FAN IS NOT ROTATING FIND OUT WHY THE FAN IS NOT ROTATING If the fan is not rotating, the problem may be in the A40 pre-regulator, the A50 DC-DC Converter or the fan. 1. Check the Line Voltage, Selector Switch Setting, and Fuse Check the main power line cord, line fuse, and actual line voltage to see that they are all correct. Figure 5-6 shows how to remove the line fuse, using a small flat-bladed screwdriver to pry off the fuse holder.
Power Supply Troubleshooting FIND OUT WHY THE FAN IS NOT ROTATING Figure 5-7 A40 Output Voltage 3. Check the A50 SHUTDOWN LED When the fan stops, the A50 SHUTDOWN LED is off. The fan generates a FAN LOCK signal. The signal is fed into the FAN LOCK SENSE circuit in the A50 DC-DC converter. If the FAN stops, the FAN LOCK signal is missing. Then the FAN LOCK SENSE circuit activates the A50 shutdown circuitry, resulting the SHUTDOWN LED being turned off.
Power Supply Troubleshooting FIND OUT WHY THE A50 SHUTDOWN LED IS OFF FIND OUT WHY THE A50 SHUTDOWN LED IS OFF Use this procedure when the fan is rotating. If the fan is not rotating, see FIND OUT WHY THE FAN IS NOT ROTATING. If the fan is rotating and the A50 SHUTDOWN LED is off, the problem may be in the A50 DC-DC Converter and any of assemblies obtaining the power from +5 VD supply and the higher power supplies. 1. Disconnect the Cable from the A50P3 Turn the analyzer power off.
Power Supply Troubleshooting FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY If the +5 VD LED is not on steadily, the +5 VD line voltage is missing or is not enough to power the analyzer. The problem may be in the A50 DC-DC Converter, the A1 CPU, and any of assemblies obtaining the power from +5 VD supply. 1. Check the A50 DC-DC Converter 1. Turn the analyzer power off. Disconnect the cable from A50P3. Turn the analyzer power on. 2.
Power Supply Troubleshooting FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY Figure 5-8 A1 CPU Connector Location 3. Turn the analyzer power on. Look at the A1 +5 VD LED. • If the LED is still off, the A1 CPU is probably faulty. Replace the A1 CPU. • If the LED goes on, the A1 CPU is verified. Continue with the next step. 4. Turn the analyzer power off. Reconnect the cables to the A1J10, A1J11, and A1J18. Turn the analyzer power on. Look at the A1 +5 VD LED.
Power Supply Troubleshooting FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY 3. Reinstall the removed assemblies one at a time. Turn the analyzer power on after each is installed. The assembly that turns the A1 +5 VD LED off is the most probable faulty assembly. Replace the assembly.
Power Supply Troubleshooting TROUBLSHOOT THE FAN AND THE A50 DC-DC CONVERTER TROUBLSHOOT THE FAN AND THE A50 DC-DC CONVERTER Perform the following procedure to troubleshoot the fan and the A50 DC-DC Converter. 1. Troubleshoot the Fan 1. Turn the analyzer power off. 2. Disassemble the rear panel. 3. Remove the fan power cable from the Motherboard A20J22. 4. Connect a DC power supply, a 10 kΩ resistance, and a oscilloscope to the fan power cable using appropriate wire as shown in Figure 5-9.
Power Supply Troubleshooting TROUBLSHOOT THE FAN AND THE A50 DC-DC CONVERTER 2. Troubleshoot the A50 DC-DC Converter 1. Turn the analyzer power off. 2. Remove the A50 from the A20 motherboard. The cable from the A50P2 and the cable from the A50P3 are connected. 3. Turn the analyzer power on. • If the A50 SHUTDOWN LED is still off, replace the A50 DC-DC Converter. • If one or more LEDs are still off, replace the A50 DC-DC Converter.
6. Digital Control Troubleshooting 6 Digital Control Troubleshooting This chapter describes troubleshooting procedures to isolate the faulty assembly within the digital control functional group.
Digital Control Troubleshooting INTRODUCTION INTRODUCTION Use this procedure only if you have followed the procedures in the Troubleshooting chapter, and believe the problem to be in the digital control group. This procedure is designed to let you identify the bad assembly within the digital control group in the shortest possible time. Whenever an assembly is replaced in this procedure, refer to the Table of Related Service Procedures in the Post-Repair Procedures chapter in this manual.
Figure 6-1 Digital Control Group Simplified Block Diagram 6 135 6.
Digital Control Troubleshooting A1 CPU Replacement A1 CPU Replacement When you replace a faulty A1 CPU with a new one, remove the EEPROM from the faulty A1 and mount the EEPROM on the replacement A1. In the EEPROM, the correction constants data is stored after performing the Adjustment and Correction Constants procedures described in chapter 3. The data may be valid for the new A1 CPU.
FIRMWARE INSTALLATION No firmware is installed in new A1 CPU assembly. When you replace a faulty A1 CPU with a new one, perform the following steps to install the firmware into the A1 CPU. Ordering the Firmware Diskette A firmware diskette (3.5 inch) that contains the analyzer's firmware is required for the firmware installation. If you do not have a firmware diskette, you must order one.
Digital Control Troubleshooting FIRMWARE INSTALLATION Figure 6-4 Bootloader Menu Display 4. Insert the firmware diskette into the floppy disk drive on the front panel. 5. Press System UPDATE and CONTINUE. The analyzer displays "Loading From Disk" and starts the firmware installation. 6. Wait until the analyzer displays "Update Complete." 7. Press REBOOT or turn the analyzer power off and on. The analyzer starts the operation using the installed firmware. 8.
START HERE 1. Check the Power-On Sequence See the INSPECT THE POWER-ON SEQUENCE section in chapter 4 for checking the Power-On Sequence. Check the [A] and [B] Operations 1. Press [A] and [B] alternately. 2. Check that the two LEDs alternately light each time you press the keys. • If both LEDs do not light, continue with Check the A1 Eight LEDs. • If the two LEDs do not alternately light (the [A] LED is still lit even if pressing the [B]), the A1 CPU is probably faulty. Replace the A1 CPU.
Digital Control Troubleshooting START HERE Figure 6-5 A1 Eight LEDs' Pattern 140 6
2. Check the A1 CPU 1. Turn the analyzer power on. 2. Press [System], DIAGNOSTIC TEST, [1], [x1], RUN TEST to run the internal test 1: A1 CPU. 3. Check the test result, PASS or FAIL, that is displayed at the end of the test. • If this test fails, replace the A1 CPU. • If this test passes, continue with the next Check the A1 DRAM and Flash Memory. 3. Check the A1 DRAM and Flash Memory The A1 DRAM and flash memory are tested on the sequence to access the bootloader menu.
Digital Control Troubleshooting START HERE Figure 6-6 Bootloader Display 4. Check the A1 Volatile Memory 1. Turn the analyzer power on. 2. Press [System], DIAGNOSTIC TEST, [2], [x1], RUN TEST to run the internal test 2: A1 VOLATILE MEMORY. 3. Check that no error message is displayed. At the end of this test, the analyzer returns the control settings to the default values (power on reset). If the test fails, the analyzer displays an error message for a few second before returning to the defaults.
2. Press all of the front panel keys. The abbreviated key name should be displayed when a key is pressed. When you rotate the RPG knob, the RPG tuned direction (CW or CCW) and its response speed (SLOW, MID, FAST) should be displayed. You can check every key on the A30 Keyboard except for [Preset]. (If you want to exit this test, press [Preset].) • If one or more keys seems to be defective, replace the A30 front keyboard. • If all keys seem to be good, the A30 front keyboard is verified.
Digital Control Troubleshooting START HERE Figure 6-7 24 BIT I/O PORT Test Setup 3. Turn the analyzer power on. 4. Press [Preset], [System], DIAGNOSTIC TEST, [1], [9], [x1], RUN TEST to run the external test 19: 24 BIT I/O. • If the external test 19 passes, the 24 BIT I/O PORT is verified. • If the external test 19 fails, replace the A51 GSP. 9. Check the LAN Operation Perform the following procedure to verify the LAN operation.
9. Press done. 10. Connect a 10Base-T twisted pair “straight-through” cable (Ethertwist) from your network to the LAN port (RJ-45 connector) of the analyzer’s rear panel. NOTE It is possible to connect a single computer to a single analyzer, and avoid using a LAN hub. To do this, you must use a special “cross-over” cable or adapter, which acts like a LAN hub. 11. Turn the analyzer power off and turn the analyzer power on. 12. Run Ping command under Windows NT or 95.
Digital Control Troubleshooting TROUBLESHOOT THE A51 GSP and A52 LCD TROUBLESHOOT THE A51 GSP and A52 LCD Use this procedure when the LCD (Liquid Crystal Display) is unacceptable, or not being bright. 1. Run the Internal Test 4: A51 GSP. The A51 GSP can be checked using the internal test 4: A51 GSP. 1. Press [Preset], [System], DIAGNOSTIC TEST, [4], [x1], RUN TEST to run the internal test 4. 2. Check the test result, PASS or FAIL, that is displayed at the end of the test.
7. Service Related Menus 7 Service Related Menus This chapter describes the functions of the diagnosis key menus. These menus are used to test, verify, and troubleshoot the 4294A.
Service Related Menus DIAGNOSTIC TEST Menu DIAGNOSTIC TEST Menu The diagnosis key menus consist of several menus that are accessed through the diagnosis menu. The diagnosis menu is displayed by pressing [System], DIAGNOSTIC TEST. When the GPIBGPIB commands are applicable, follow the keystrokes in parentheses. The listed below specifies the test number and is an integer from 0 to 31. RUN TEST (:DIAG:TEST:EXEC) Runs the selected test.
Service Related Menus DIAGNOSTIC TEST Menu Figure 7-1 Test Status on the Display 7. Service Related Menus To see the test status of the desired test, enter the desired test number using the numeric keypad, [↑], [↓], or RPG knob. Also, the GPIB commands listed below are available to get the status using GPIB. :DIAG:TEST:RES? returns the test status. The specifies the test number and is an integer from 0 to 31. *TST? executes internal test 0: ALL INTERNAL and returns the test result.
Service Related Menus DIAGNOSTIC TEST Menu INTERNAL TEST This group of tests run without external connections or operator interaction. All return a “PASS” or “FAIL” indication on the display. Except as noted, all are run during the power on self-test. 0: ALL INTERNAL Runs only when selected. It consists of internal tests 1 through 16. If any of these tests fail, this test displays the “FAIL” status indication. Use the RPG knob to scroll through the tests to see which test failed.
Service Related Menus DIAGNOSTIC TEST Menu 5: ADJUST DATA Verifies that all correction constants which compensate for the hardware performance of the analyzer are stored in the EEPROM on A1 CPU. 6: BOARD ID Checks the board IDs, A2, A3, A4, A5, A6, A7, A8, and A9 board. Verifies the A/D converter in the A8 Vector Ratio Detector. This test measures the following frequency bus nodes and DC bus nodes. It then checks that each measured value is within limits.
Service Related Menus DIAGNOSTIC TEST Menu (230kHz) signal at a frequency bus node. It checks that each measured value is within limits. 15: A2/A9 AC OSC LEVEL Verifies the source circuit in the A2. This test measures the signal level at low frequencies with the A/D converter in the A2. It checks that the measured value is within limits. It also checks the floating section control signal of the A2. 16: A2/A9 DC BIAS LEVEL Verifies the DC bias circuit in the A2.
Service Related Menus DIAGNOSTIC TEST Menu the adapter selection of the analyzer is changed to the “NONE” status. 23: A2 ATT Checks the attenuator circuit in the A2 which generates the signal level.This test requires an OPEN termination (42090A) or two BNC cables. It must be done before external tests 24, 25, or 26 are performed. At the end of the test, the adapter selection of the analyzer is changed to the “NONE” status. Checks the input amplifier circuit in the A5.
Service Related Menus DIAGNOSTIC TEST Menu 154 7
8. Theory of Operation 8 Theory of Operation This chapter describes the general overall operation of the 4294A and the operation of each functional group. The operation of each group is described to the assembly level only. Detailed component-level circuit theory is not provided in this manual.
Theory of Operation OVERALL OPERATION OVERALL OPERATION OVERALL MEASUREMENT THEORY The 4294A measures the impedance of the Device Under Test (DUT) by measuring vector voltage to current ratio. A vector is a value which consists of a magnitude and a phase. The impedance of the DUT is determined by the vector ratio between the voltage across the DUT and the current flowing through it.
Theory of Operation OVERALL OPERATION Processor), the A52 LCD, and the A53 FDD. These assemblies combine to provide digital control for the analyzer. Source: The source group consists of the A7 synthesizer, the A2 Hc Amp., and the A60 high stability frequency reference(option 1D5 only).
Theory of Operation POWER SUPPLY OPERATION POWER SUPPLY OPERATION The power supply functional group consists of the following assemblies: • A40 Preregulator • A50 DC-DC Converter • A9 Floating Power Supply These assemblies comprise a switching power supply that provides regulated DC voltages to power all assemblies in the 4294A. See Figure 8-2.
Theory of Operation POWER SUPPLY OPERATION Figure 8-2 Power Supply Functional Group, Simplified Block Diagram 8. Theory of Operation Line Power Module The line power module includes the main fuse. The main fuse, which protects the input side of the preregulator from drawing too much line current, is also accessible at the rear panel. See Power Requirements in appendix B for the fuse replacement and other power considerations.
Theory of Operation POWER SUPPLY OPERATION A40 Preregulator The A40 preregulator contains a rectifier and a switching regulator, converts the line voltage to + 24 V and provides it to the A50 DC-DC converter. A50 DC-DC Converter The A50 DC-DC Converter consists of the two switching regulators. The DC-DC converter provides LEDs(red) to indicate circuit status. The shutdown LED is turned off when the overcurrent protection circuit activates.
Theory of Operation DIGITAL CONTROL OPERATION DIGITAL CONTROL OPERATION The digital control functional group consists of the following assemblies: • A1 CPU • A30 Front Keyboard • A32 I-BASIC Interface • A34 I/O Connector • A51 GSP • A52 LCD • A53 FDD These assemblies combine to provide digital control for the 4294A. They provide math processing functions, as well as communications between the 4294A and an external controller and/or peripherals.
Theory of Operation DIGITAL CONTROL OPERATION Figure 8-3 Digital Control Group Simplified Block Diagram 162 8
Theory of Operation DIGITAL CONTROL OPERATION A1 CPU The A1 CPU consists of the following circuits and parts: central processing unit that controls the analyzer. DSP digital signal processor that is used for fast data processing. Memory storages consists of BOOT ROMs, Flash Memory, EEPROM, Backup SRAM, DRAM, and Dual Port SRAM. The backup SRAM is powered from a large capacitor that is charged when the analyzer is turned on.
Theory of Operation DIGITAL CONTROL OPERATION terminal, the PRINTER port, the 24-BIT I/O PORT, and the LAN port. A51 GSP The A51 GSP (graphics system processor) provides an interface between the A1 CPU and the A52 LCD. The A1 CPU converts the formatted data to GSP commands and writes them to the A51 GSP. The A51 GSP processes the data to obtain the necessary signals and sends these signals to the A52 LCD.
Theory of Operation SOURCE THEORY SOURCE THEORY The source group generates all analog signals in the 4294A, a phase-locked test signal(fm) to the device under test, a DC bias signal to the device under test, IF signals for the transducer group and the vector ratio detector group, and a sampling signal for the A-D converter on the vector ratio detector. Figure 8-4 Source Group Simplified Block Diagram 8.
Theory of Operation SOURCE THEORY • 8MHz (for A/D converter clock): is supplied to the A8 through the A20. • 10MHz: is routed to the INT REF Output connector on the rear panel. A2 Hc Amp. The A2 Hc amp. produces a stable and accurate test signal. This signal is a CW or swept signal between 40 Hz to 110 MHz, with a OSC level from 5 mV to 1Vrms/200 μA to 20 mArms. The 240 MHz signal from the A7 is applied to the mixer of the A2.
Theory of Operation TRANSDUCER THEORY TRANSDUCER THEORY The transducer group balances the range resistor current with the DUT current to maintain a zero potential at the low terminal(Lp) and transforms the DUT impedance, or admittance, into two AC signals (“Edut” and “Err”). Figure 8-5 Transducer Group Simplified Block Diagram 8. Theory of Operation The transducer group consists of the following assemblies: • A3 Hp Amp. • A4 Lc Amp. • A5 IV Converter & Lp Amp.
Theory of Operation TRANSDUCER THEORY A3 Hp Amp. The A3 Hp amp. senses the voltage across the DUT (Edut), and transmit the voltage (Edut) to the vector ratio detector. The voltage across the range resistor(Err) from the A4 Lc amp. is transmitted to the vector ratio detector through the A3 Hp amp. The A3 Hp amp. also switches these two voltages to transmit to the vector ratio detector. A4 Lc Amp. The A4 Lc amp. senses the voltage across the range resistor (Err), and transmits the voltage to the A3 Hc amp.
Theory of Operation VECTOR RATIO DETECTOR THEORY VECTOR RATIO DETECTOR THEORY The A8 board is the vector ratio detector. The vector ratio detector converts the AC voltages from the transducer group into digital data. Figure 8-6 Vector Ratio Detector Group Simplified Block Diagram 8. Theory of Operation A8 Vector Ratio Detector The A8 vector ratio detector converts the “Edut” or “Err” signal from the A3 into an equal phase IF signal by mixing with the fm+fIF signal from the A7.
Theory of Operation VECTOR RATIO DETECTOR THEORY 170 8
9. Parts Replacement 9 Parts Replacement This chapter contains the 4294A’s replaceable parts list and the procedure to replace its assemblies.
Parts Replacement Replaceable Part List Replaceable Part List Ordering Information To order part listed in the replaceable part lists, quote the Agilent Technologies part number (with a check digit), indicate the quantity required, and address the order to the nearest Agilent Technologies office. The check digit will ensure accurate and timely processing of the order.
Parts Replacement Replaceable Part List Parts List Figure 9-1 Power Cables and Plug Configurations 9.
Parts Replacement Replaceable Part List Figure 9-2 Top View (Major Assemblies) 174 9
Parts Replacement Replaceable Part List Table 9-1 Top View (Major Assemblies) Reference Designation Agilent Part Number Check Digit Qty. Description A2 04294-66502 3 1 High Current 04294-69502 9 1 High Current (rebuilt-exchange) 04294-66503 4 1 Hp Amplifier. 04294-69503 0 1 Hp Amplifier. (rebuilt-exchange) 04294-66504 5 1 Lc Amplifier. 04294-69504 1 1 Lc Amplifier.
Parts Replacement Replaceable Part List Figure 9-3 Top View (Cables and Wires) 176 9
Parts Replacement Replaceable Part List Table 9-2 Top View (Cables and Wires) Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-4 Top View (Miscellaneous Parts) Table 9-3 Top View (Miscellaneous Parts) Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-5 Top View (Shield) Table 9-4 Top View (Shield) Agilent Part Number Check Digit Qty. Description 1 04294-00601 5 1 Top Shield 2 0515-0914 8 27 Screw-Mach M3X0.5 3 0515-1719 3 4 Screw M4X10 4 0515-0889 6 5 Screw M3.5 9 9.
Parts Replacement Replaceable Part List Figure 9-6 Bottom View (Major Assemblies) Table 9-5 Bottom View (Major Assembly) Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-7 Bottom View (Cables and Wires) Table 9-6 Bottom View (Cables and Wires) Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-8 Bottom View (Miscellaneous Parts) 182 9
Parts Replacement Replaceable Part List Table 9-7 Bottom View (Miscellaneous Parts) Reference Designation Agilent Part Number Check Digit Qty. Description 1 0515-1719 3 4 Screw M4 2 0515-1550 0 12 Screw M3-L 8 (for A20) 04294-00111 2 1 Deck 0515-0914 8 4 Screw-Mach M3X0.5 (for deck) 0515-1550 0 12 Screw M3-L 8 P-H (for A1) 3 5183-4131 0 1 IC Flash 4 0950-3334 4 1 A53 FDD 3.5 04294-01275 1 1 Holder 04396-25004 7 1 Sponge 0515-0924 0 4 Screw-Mach M3X0.
Parts Replacement Replaceable Part List Figure 9-9 Front Assembly 1 Table 9-8 Front Assembly 1 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-10 Front Assembly 2 Table 9-9 Front Assembly 2 Agilent Part Number Check Digit Qty. Description 1 04396-40003 8 1 Guide 2 04294-25052 2 1 Keypad Rubber 3 04294-66530 7 1 A30 Front Keyboard 4 0515-1550 0 8 Screw M3-L 8 P-H 9 9.
Parts Replacement Replaceable Part List Figure 9-11 Front Assembly 3 Table 9-10 Front Assembly 3 Reference Designation Agilent Part Number Check Digit Qty. Description 1 2090-0361 6 1 A52 LCD 8.
Parts Replacement Replaceable Part List Figure 9-12 Front Assembly 4 Table 9-11 Front Assembly 4 Agilent Part Number Check Digit Qty. Description 1 04294-04011 7 1 Cover 2 04352-25002 8 1 Insulator 3 0950-2924 6 1 A54 Inverter 4 0515-0977 3 2 Screw-Mach M2X0.4 5 E4970-25003 9 1 Sponge 6 0400-0010 2 1 Grommet 7 04294-61623 6 1 Cable 9 9.
Parts Replacement Replaceable Part List Figure 9-13 Front Assembly 5 Table 9-12 Front Assembly 5 Reference Designation Agilent Part Number Check Digit Qty. Description 1 0515-0924 0 1 Screw-MACH M3X0.
Parts Replacement Replaceable Part List Figure 9-14 Front Assembly 6 Table 9-13 Front Assembly 6 Agilent Part Number Check Digit Qty. Description 1 04294-00607 7 1 Case Shield 2 0515-0914 9 4 Screw-Mach M3X0.5 9 9.
Parts Replacement Replaceable Part List Figure 9-15 Front Assembly 7 Table 9-14 Front Assembly 7 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-16 Front Assembly 8 Table 9-15 Front Assembly 8 Agilent Part Number Check Digit Qty. Description 1 0515-0907 9 2 Screw-MACH M3X0.5 2 9170-1794 1 1 Magnetic Core 3 1400-0611 0 1 Cable Clamp 9 9.
Parts Replacement Replaceable Part List Figure 9-17 Front Assembly 9 Table 9-16 Front Assembly 9 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-18 Front Assembly 10 Table 9-17 Front Assembly 10 Agilent Part Number Check Digit Qty. Description 1 04191-08000 0 1 Spring 2 04294-00201 1 1 Front Panel 3 04396-40051 6 1 Bezel 4 04294-87101 2 1 Label 4294A 5 5041-0564 4 1 Key Cap 6 5182-7522 6 1 Knob 7 5041-9173 9 2 Side Trim 8 5041-9176 2 1 Trim Strut 9 9.
Parts Replacement Replaceable Part List Figure 9-19 Rear Assembly 1 Table 9-18 Rear Assembly 1 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-20 Rear Assembly 2 Table 9-19 Rear Assembly 2 Agilent Part Number Check Digit Qty. Description 1 E4970-66532 5 1 A32 I-BASIC_IO 2 3050-1546 1 1 Washer 3 2190-0054 9 1 Washer 4 2950-0054 1 1 Nut 5 1251-7812 0 2 Jackscrew 9 9.
Parts Replacement Replaceable Part List Figure 9-21 Rear Assembly 3 196 9
Parts Replacement Replaceable Part List Table 9-20 Rear Assembly 3 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-22 Rear Assembly 4 Table 9-21 Rear Assembly 4 Reference Designation Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Figure 9-23 Rear Assembly 5 Table 9-22 Rear Assembly 5 Agilent Part Number 1 See Table 9-2 2 9170-1791 3 Qty. Description 1 Flat Cable, A1 to A51 8 1 Magnetic Core 0400-0276 2 1 Grommet 4 0515-2079 0 1 Screw M4X8 5 04396-61663 0 1 Flat Cable 6 1400-1334 6 1 Cable Clamp 9 Check Digit 9.
Parts Replacement Replaceable Part List Figure 9-24 Side View Table 9-23 Side View Reference Designation Agilent Part Number Check Digit Qty. Description 1 0515-1668 1 16 Screw Metric 2 0515-1719 3 14 Screw M4X10 3 0515-1718 2 2 Screw M4X12 4 0515-1011 8 2 Screw M4L6 (hidden) 5 04294-60011 5 1 Chassis 6 0515-0889 6 2 Screw M3.
Parts Replacement Replaceable Part List Figure 9-25 Chassis Assembly Table 9-24 Chassis Assembly Agilent Part Number Check Digit Qty.
Parts Replacement Replaceable Part List Table 9-25 Other Parts Reference Designation Agilent Part Number Check Digit Qty. Description 1 04294-61001 7 1 100 Ω Resistor 2 1250-1859 1 1 BNC(m)-BNC(m) Adapter (Opt.
Parts Replacement Replacement Procedure Replacement Procedure This Chapter describes how to replace the 4294A major assemblies.The cover and panel removal procedures that are required for some assembly replacements are described first. Then the replacement procedures for each major assembly are described. Top Cover Removal Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #2 (medium) Procedure 1. Disconnect the power cable from the 4294A. 2.
Parts Replacement Replacement Procedure 2. Remove the two screws at the side strap handle caps to remove the strap. 3. Slide off the side cover toward the rear. Front Panel Removal Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #2 (medium) • Flat bladed screwdriver. Procedure 1. Disconnect the power cable from the 4294A. 2. Place the 4294A upside down. 3. Remove four screws from the bottom of the front frame. 4. Turn the 4294A over into the correct position. 5.
Parts Replacement Replacement Procedure 6. Gradually pull the rear panel assembly out from the rear frame. A1 CPU Board Replacement Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) • IC Extractor Procedure 1. Remove the bottom cover as described in the “Bottom Cover Removal” procedure. 2. Disconnect all cables and wires from A1 CPU Board. 3. Remove the EEPROM from A1 (see Figure 9-8). 4. Mount the EEPROM on the replacement A1.
Parts Replacement Replacement Procedure 6. Disconnect the cable “C” from the A3 Hp Amplifier, and connect it to the replacement A3. A4 Lc Amplifier Replacement Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) Procedure 1. Remove the top cover as described in the “Top Cover Removal” procedure. 2. Remove the top shield. 3. Disconnect the cables “K” and “L” from the A2 board. 4. Disconnect the cable “D” from the A3 board. 5.
Parts Replacement Replacement Procedure 2. Remove the top shield. 3. Disconnect the cables “K” and “L” from the A7 board. 4. Disconnect the cable “D” from the A3 board. 5. Disconnect all cables from the A6 board. 6. Lift the extractors at the top of the A6 board, and lift the A6 board out. A7 Synthesizer Replacement Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) Procedure 1. Remove the top cover as described in the “Top Cover Removal” procedure. 2.
Parts Replacement Replacement Procedure Figure 9-26 A9 Floating Power Supply 3. Disconnect the cables (item ¦ and Æ)from the A9 board. 4. Remove five screws fixing the A9 board. 5. Lift the A9 board (item Ø). A53 FDD Removal Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) Procedure 1. Remove the bottom cover as described in the “Bottom Cover Removal” procedure. 2. Remove the shield case from the chassis. 3. Remove the FDD from the shield case. 4.
Parts Replacement Replacement Procedure A52 LCD Removal Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) Procedure 1. Remove the front panel as described in the “Front Panel Removal” procedure. 2. Remove the LCD’s cover. 3. Pull the flat cable out from the magnetic core stuck on the cover. 4. Remove the LCD Assembly from the cover. 5. Remove the shield from the cover. 6. Disconnect the cable from the inverter.
Parts Replacement Replacement Procedure Figure 9-27 Preregulator Replacement Power Switch Replacement Tools Required • Torx screwdriver, T15 • Pozidriv Screwdriver, pt size #1 (small), #2 (medium) Procedure 1. Remove the rear panel and the Preregulator as described in the “Rear Panel Removal” and “A40 Preregulator Replacement” procedures. 2. Release the power switch cable from the cable clamp.
Parts Replacement Replacement Procedure Figure 9-28 Cable Clamp 3. Remove the angel from the chassis. 4. Disconnect the power switch cable from the rear panel. 9.
Parts Replacement Replacement Procedure 212 9
10 Post Repair Procedures 213 10. Post Repair Procedures This chapter lists the procedures required to verify the 4294A operation after an assembly is replaced with a new one.
Post Repair Procedures POST REPAIR PROCEDURES POST REPAIR PROCEDURES Table 10-1 Post Repair Procedures lists the required procedures that must be performed after the replacement of an assembly or the EEPROM. These are the recommended minimum procedures to ensure that the replacement is successfully completed. When you replace an assembly or the EEPROM on the A1 CPU, perform the adjustments and updating correction constants (CC) in Table 10-1.
Post Repair Procedures POST REPAIR PROCEDURES Table 10-1 Post Repair Procedures Replaced Assembly or Part Adjustments Correction Constants (CC) Verification A7 Synthesizer Frequency Accuracy CC Image Rejection CC Null Detector Offset CC Null Loop Phase CC Relative Impedance CC OSC Level Monitor CC OSC Level CC Impedance Measurement CC Inspect the Power On Sequence*2 Frequency Accuracy Test OSC Level Accuracy Test Measurement Accuracy Test A8 Vector Ratio Detector Image Rejection CC Relative Impeda
Post Repair Procedures POST REPAIR PROCEDURES 216 10
A. Manual Changes A Manual Changes This appendix contains the information required to adapt this manual to earlier versions or configurations of the 4294A than the current printing date of this manual. The information in this manual applies directly to an 4294A whose serial number prefix is listed on the title page of this manual.
Manual Changes Manual Changes Manual Changes To adapt this manual to your 4294A, refer to Table A-1 and Table A-2. Table A-1 Manual Changes by Serial Number Serial Prefix or Number Table A-2 Make Manual Changes Manual Changes by Firmware Version Version Make Manual Changes Agilent Technologies uses a two-part, ten-character serial number that is stamped on the serial number plate (see Figure A-1). The first five characters are the serial prefix and the last five digits are the suffix.
B.
Power Requirement Replacing Fuse Replacing Fuse Fuse Selection Select proper fuse according to the Table B-1. Table B-1 Fuse Selection Fuse Rating/Type Fuse Part Number 5A 250Vac UL/CSA type 2110-0030 Time Delay For ordering the fuse, contact your nearest Agilent Technologies Sales and Service Office. Open the cover of AC line receptacle on the rear panel using a small minus screwdriver. 220 To check or replace the fuse, pull the fuse holder and remove the fuse.
Power Requirement Power Requirements Power Requirements The 4294A requires the following power source: Voltage : 90 to 132 Vac, 198 to 264 Vac Frequency : 47 to 63 Hz Power : 300 VA maximum In accordance with international safety standards, this instrument is equipped with a three-wire power cable. When connected to an appropriate ac power outlet, this cable grounds the instrument frame. The type of power cable shipped with each instrument depends on the country of destination.
Power Requirement Power Requirements Figure B-1 Power Cable Supplied 222 Appendix B
C. Error Messages C Error messages The 4294A provides error messages to indicate its operating status. This appendix describes the error messages of the 4294A. Error messages are outputted on the 4294A’s LCD or through GPIB. This section gives you the description of each error message and its remedy.
Error messages Order of Alphabet NOTE If an error with a positive error number occurs, only its error message is displayed on the LCD following the string of “CAUTION:” (in this case, its error number is not displayed). On the other hand, if an error with a negative error number occurs, “CAUTION: GPIB error occurred” is always displayed on the LCD. When error messages are outputted through GPIB, their error number and error message are outputted for all errors (“CAUTION:” is not added).
Error messages Order of Alphabet 136 BRIDGE UNBALANCED Because the connection of a DUT or the setting for it was incorrect, the internal circuit (BRIDGE) temporarily could not perform measurements (UNBALANCED). • The setting of the four-terminal pair extension (NONE, 4TP 1M, 4TP 2M, 7mm 42942A, PROBE 42941A) may not match with the fixture, cable, adapter, or probe actually connected. Check and correct the setting.
Error messages Order of Alphabet error coefficients based on the measurement. -281 Cannot create program Programs cannot be created. Insufficient memory is suspected. 35 CAN'T CALCULATE EQUIVALENT PARAMETERS Because measurement data does not match with the selected equivalent circuit, equivalent circuit parameters cannot be calculated. Acquire data again or select another equivalent circuit.
Error messages Order of Alphabet A comprehensive syntax error occurred for which the 4294A could not detect further details of the error. This error code simply indicates the occurrence of a command error that is defined in IEEE488.2,11.5.1.1.4.
Error messages Order of Alphabet 138 DCBIAS CONSTANT OPERATION FAILED When the DC bias mode was constant voltage (VOLT CONSTANT) or constant current (CURRRENT CONSTANT), the actual DC bias output did not converge to the set DC voltage value or DC current value, or it exceeded the set voltage limit or current limit. If a DUT needs time to be stabilized after DC bias is applied, specify the point delay. If necessary, change the voltage limit value or the current limit value.
Error messages Order of Alphabet An equation data element was received at where the 4294A did not accept any equation data elements. -170 Expression error An error not included in error numbers between -171 and -179 occurred during the syntax analysis of equation data. F -257 FILE NAME ERROR There was an error in the filename and, as a result, the command was not executed correctly. This message is displayed, for example, when you attempt to copy a file using the same filename.
Error messages Order of Alphabet -105 GET not allowed A group execution trigger (GET) was received in a program message. (Refer to IEEE488.2,7.7.) H -240 Hardware error A hardware error. The program command could not be executed due to an hardware-related error. An error other than -241 to -249 occurred. -241 Hardware missing The received command or Query complied with the standard but could not be executed due to hardware-related reasons (for example, the option was not installed).
Error messages Order of Alphabet -161 Invalid block data Block data was expected but given block data was invalid for some reasons. (Refer to IEEE488.2,7.7.6.2.) For example, the END message was received before the length of the block data was reached. -101 Invalid character Invalid characters exist in the program message string. For example, for a correct program message, “MEAS IRIM,” an ampersand (&) is inserted by mistake, like “MEAS&IRIM.
Error messages Order of Alphabet L 132 LIST SWEEP ONLY When a sweep type other than the list sweep was specified, you attempted to execute a command to specify all segments (entire sweep range) as the search range setting (SEARNG FULL) or a command to specify a certain segment as the search target (SEGMNUM ) and, as a result, the command was ignored. Before setting the search range for the list sweep, specify the list sweep as the sweep type (command: SWPT LIST).
Error messages Order of Alphabet When the memory trace was not displayed, you attempted to set the function that needed the display of the memory trace and, as a result, the command was ignored. For example, a command (MKRO MEMO or SCAF MEMO) corresponding to the MARKER ON [MEMORY] key display or the SCALE FOR [MEMO] key display was sent. Before setting the function that needs the display of the memory trace, display the memory trace (command: DISP MEMO or DISP DATM).
Error messages Order of Alphabet (COPY FILE) key, no file or directory corresponding to the execution of the key was on the floppy disk.
Error messages Order of Alphabet When the percent format was not selected as the display format, you attempted to select delta % as the data operation setting (you sent the MATH DELP command). If you want to select delta % as the data operation setting, the percent format (command: FMT PERC) must have been selected as the display format. 48 PHASE LOCK LOOP UNLOCKED Anomalies in the 4294A’s internal circuit were detected (phase lock loop was not locked). The instrument needs adjustment or repair.
Error messages Order of Alphabet the error. This code simply indicates the occurrence of a Query error that is defined in IEEE488.2,11.5.1.1.7 and 6.3. -410 Query INTERRPUTED Status that causes an “INTERRUPTED” Query error. (Refer to IEEE488.1,6.3.2.3.) This error occurs, for example, when, after Query, data byte (DAB) or GET is received before the response has been sent completely. -420 Query UNTERMINATED Status that causes an “UNTERMINATED” Query error. (Refer to IEEE488.2,6.3.2.
Error messages Order of Alphabet When the band width function was off, you attempted to execute a command to search the cutoff point on the trace (WIDSIN or WIDSOUT) and, as a result, the command was ignored. Before executing the cutoff point search of the band width function, turn on the band width function (command: WIDT ON). -330 Self-test failed The result of the self-test was a failure. Contact your local Agilent Technologies sales office or service center, or refer to the service manual.
Error messages Order of Alphabet Before executing a command to set the phase unit or a command to set the phase expansion display, perform one of the above settings. -124 Too many digits The number of digits of the mantissa of the decimal value data element exceeds 255 except preceding 0s. (Refer to IEEE488.27.7.2.4.1.) 64 TOO MANY SEGMENTS You attempted to add segments whose quantity exceeded the maximum number (18) to the limit line table.
Error messages Order of Alphabet For a 24-bit input/output (I/O) shared port (port C and port D), you attempted to execute input/output (I/O) of data in the direction opposite from the preset input/output direction. The command was invalid. For example, if you use the CIN command to specify port C as an input port and then use the OUTCIO command to output data from port C, this error is displayed. C.
Error messages Order of Alphabet 240 Appendix C
