® 8508A Reference Multimeter Service Manual September 2004 Rev. 1, 8/08 © 2004, 2008 Fluke Corporation, All rights reserved. Specifications are subject to change without notice All product names are trademarks of their respective companies.
Manual Supplement Manual Title: 8508A Service Print Date: July 2002 Revision/Date: 1, 8/08 Supplement Issue: Issue Date: Page Count: 1 3/09 1 This supplement contains information necessary to ensure the accuracy of the above manual. This manual is distributed as an electronic manual on the following CD-ROM: CD Title: CD Rev. & Date: CD PN: © 2009 Fluke Corporation. All rights reserved. Printed in U.K.
8508A Service Manual Supplement Change #1 On page 4-12, replace Table 4-1 with the following: Table 4-1. Power Input Fuse 1 8508A Line Setting Manufacturer Part Number Size 230 V Line 630 mA 250 V 20 mm (TH) Schurter 001.2502 1582145 115 V line 1.25 A 250 V 20 mm (TH) Schurter 001.2505 1582150 100 V Line 1.6 A 250 V 20 mm (F) Schurter 0001.
Warranty 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.
Table of Contents Chapter 1 Title Introduction and Specifications......................................................... 1-1 Introduction........................................................................................................ Safety Considerations ........................................................................................ Symbols ......................................................................................................... Service Information ....................
8508A Service Manual 3 Calibration and Verification................................................................ 3-1 Introduction........................................................................................................ Calibration Overview......................................................................................... Calibration Interval and Performance ................................................................ Calibration Points ..........................................
Contents (continued) Removing the A5 Bezel Assembly................................................................ Removing the A5A1 Display PCA................................................................ Removing the A6 Rear Input Assembly........................................................ Fuse Replacement and Line-Voltage Selection ................................................. Line-Power Fuse F1 and Voltage Selection ..................................................
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List of Tables Table 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 5-1. 5-2. 5-2. 5-4. Title Required Equipment for Calibration and Performance Verification...................... Calibration Sequence ............................................................................................. DC Voltage Calibration Points and Sequence........................................................ AC Voltage Calibration Points and Sequence.............
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List of Figures Figure 1-1. 2-1. 2-2. 3-1. 4-1. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 5-1. 5-2. 5-3. 5-4. Title 8508A Dimentional Outline Drawing .................................................................... 8508A Functional Block Diagram ......................................................................... Power Supplies - Simplified Block Diagram ......................................................... Equipment Connections Required for Calibration ..............................................
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riešenia na presné meranie Chapter 1 Introduction and Specifications Title Introduction.......................................................................................................... Safety Considerations .......................................................................................... Symbols ........................................................................................................... Service Information ..................................................................
8508A Service Manual 1-2 riešenia na presné meranie http://www.elso.
riešenia na presné meranie Introduction and Specifications Introduction 1 Introduction The Fluke 8508A Reference Multimeter (hereafter "the Multimeter") is designed for the most demanding measurement applications and provides extremely high measurement precision in both stand-alone and systems applications. This Service Manual provides the information necessary to maintain the Multimeter at a module (or board) level.
8508A Service Manual riešenia na presné meranie XW Safety – Read First Warning: To avoid possible electric shock, personal injury, or death, read the following before using the Multimeter: 1-4 ⇒ Use the Multimeter only as specified in this manual, or the protection provided by the Multimeter might be impaired. ⇒ Do not use the Multimeter in wet environments. ⇒ The Multimer can output lethal voltages. Use it only as described in this manual. ⇒ Inspect the Multimeter before using it.
riešenia na presné meranie Introduction and Specifications Safety Considerations 1 Symbols The following safety and electrical symbols may be used on the Multimeter or in this manual. W Risk of danger. + Power ON / OFF J Earth ground. Important information. See manual. X Hazardous voltage. Voltage > 30 V dc or ac peak might be present B AC (Alternating Current). CAT IEC 61010 Overvoltage (installation or measurement) Category . F DC (Direct Current). I Fuse.
riešenia na presné meranie 8508A Service Manual Service Information In case of difficulty within the 1-year Warranty period, return the Multimeter to a Fluke Service Center for Warranty repair. For out of Warranty repair, contact a Fluke Service Center for a cost estimate. This service manual provides instructions for verification of performance, calibration, and maintenance. If you choose to repair a malfunction, information in this manual can help you to determine which module (PCA) has a fault.
riešenia na presné meranie Introduction and Specifications Specifications 1 General Specifications Power Voltage 115 V Setting ..................................................... 100 V to 120 V rms ±10 % 230 V Setting ..................................................... 200 V to 240 V rms ±10 % Frequency ............................................................... 47 Hz to 63 Hz Consumption........................................................... < 80 VA Dimensions Height.........................
riešenia na presné meranie 8508A Service Manual Maximum Voltage and Current Inputs Notes to maximum voltage and current input specifications • Maximum DC input equal to maximum rms input. Maximum peak input is rms x 1.414 • Specifications apply equally to front and rear input terminals except where noted below. • Front to rear isolation allows opposing polarity of maximum terminal voltage on each input. • Digital I/O Ground (DigGnd) is internally connected to Safety Ground (Ground).
riešenia na presné meranie Introduction and Specifications Specifications 1 DC Voltage DC Voltage [1] [2] [3] Uncertainty Relative to Cal Stds Absolute Uncertainties [4] Range Full Scale ± (ppm Reading + ppm Range) [15] 24 hour TCal ±1 °C 95 % Confidence Level 200 mV 199.990 000 2V 1.999 900 00 20 V 19.999 000 0 200 V 199.990 000 1000 V 1050.000 00 99 % Confidence Level 200 mV 199.990 000 2V 1.999 900 00 20 V 19.999 000 0 200 V 199.990 000 1000 V 1050.000 00 Range 90 day TCal ±1 °C 0.7 + 0.5 0.
riešenia na presné meranie 8508A Service Manual DC Current DC Current [1] [2] [3] Uncertainty Relative to Cal Stds Range [15] Full Scale 24 hour TCal ±1 °C 95 % Confidence Level 200 μA 199.990 00 2 mA 1.999 900 0 20 mA 19.999 000 200 mA 199.990 00 2A 1.999 900 0 20 A 19.999 000 99 % Confidence Level 200 μA 199.990 00 2 mA 1.999 900 0 20 mA 19.999 000 200 mA 199.990 00 2A 1.999 900 0 20 A 19.
riešenia na presné meranie Introduction and Specifications Specifications 1 AC Voltage AC Voltage [1] [2] [6] [7] Uncertainty Relative to Cal Stds [9] Absolute Uncertainties [4] Range Full Scale [15] 95% Confidence Level 200 mV 199.990 0 2 V, 20 V & 200 V 1.999 900 19.999 00 199.
riešenia na presné meranie 8508A Service Manual AC Voltage (Secondary Specifications)[1] [2] Temperature Coefficient 5 °C - 15 °C 30 °C - 40 °C Range Frequency (Hz) 15 °C - 30 °C 200 mV 1 - 10 10 - 40 40 - 100 100 - 2 k 2 k - 10 k 10 k - 30 k 30 k - 100 k 5 5 5 5 12 15 40 10 10 10 10 20 20 60 2V 20 V 200 V 1 - 10 10 - 40 40 - 100 100 - 2 k 2 k - 10 k 10 k - 30 k 30 k - 100 k 100 k - 300 k 300 k - 1 M 5 5 5 5 10 12 40 60 80 10 10 10 10 15 20 60 90 120 1000 V 1 - 10 10 - 40 40 - 10 k 10 k - 30
riešenia na presné meranie Introduction and Specifications Specifications 1 AC Current AC Current [1] [2] [6] [9] Uncertainty Relative to Cal Stds Range Full Scale [15] 95% Confidence Level 199.990 0 200 μA 2 mA & 20 mA 1.999 900 19.9990 00 200 mA 199.990 0 2A 1.999 900 20 A 19.999 00 99% Confidence Level 199.990 0 200 μA 2 mA & 20 mA 1.999 900 19.999 00 200 mA 199.990 0 2A 1.999 900 20 A 19.
riešenia na presné meranie 8508A Service Manual AC Current (Secondary Specifications) [1] [2] [6] [9] Temperature Coefficient Range Frequency (Hz) ± ppm Reading/°C 200 μA, 2 mA & 1 - 10 20 mA 10 - 10 k 10 k - 30 k 30 k - 100 k 200 mA 1 - 10 10 - 10 k 10 k - 30 k 2A 10 - 2 k 2 k - 10 k 10 k - 30 k 20 A 10 - 2 k 2 k - 10 k 10 10 12 40 10 15 15 10 15 20 20 25 Input Impedance (Ω) 5 °C - 15 °C 30 °C - 40 °C 15 °C - 30 °C 15 15 20 60 15 20 20 15 20 30 25 30 Range 200 μA 2 mA 20 mA Front Rear 150 15.
riešenia na presné meranie Introduction and Specifications Specifications 1 Resistance Resistance [1] [2] [3] [9] Uncertainty Relative to Cal Stds Range Full Scale [15] 95% Confidence Level 2Ω 1.999 900 00 20 Ω 19.999 000 0 200 Ω 199.990 000 2 kΩ 1.999 900 00 20 kΩ 19.999 000 0 200 kΩ 199.990 000 2 MΩ 1.999 900 00 20 MΩ 19.999 000 0 200 MΩ 199.990 000 2 GΩ 1.999 900 00 2Ω 1.999 900 00 20 Ω 19.999 000 0 200 Ω 199.990 000 2 kΩ 1.999 900 00 20 kΩ 19.999 000 0 200 kΩ 199.990 000 2 MΩ 1.
riešenia na presné meranie 8508A Service Manual Resistance - Normal Mode (Secondary Specifications) [1] [2] [3] [10] Range Measurement Current 2Ω 20 Ω 200 Ω 2 kΩ 20 kΩ 200 kΩ 2 MΩ 20 MΩ 200 MΩ 2 GΩ 100 mA 10 mA 10 mA 1 mA 100 μA 100 μA 10 μA 1 μA 100 nA 10 nA Temperature Coefficient Transfer Uncertainty 20 mins ±1 °C ± (ppm Reading + ppm Range) 15 °C - 30 °C 2.0 + 2.0 0.8 + 0.7 0.2 + 0.15 0.2 + 0.15 0.2 + 0.15 0.2 + 0.15 0.5 + 0.5 2.5 + 5 15 + 50 200 + 500 1.5 0.6 0.5 0.5 0.5 0.5 0.
riešenia na presné meranie Introduction and Specifications Specifications 1 Temperature Temperature Readout [1] [2] [3] Typical Equivalent Temperature Measurement Uncertainty Absolute Resistance Measurement Uncertainty [4] 365 day Tcal ±1 °C [11] ±(ppm Reading + mΩ) [12] Probe Type Nominal Temperature (°C) Resistance (Ω) Accuracy ± (°C) 7.5 + 0.14 25 Ω PRT/SPRT 25 Ω PRT/SPRT 25 Ω PRT/SPRT 100 Ω PRT/SPRT 100 Ω PRT/SPRT 100 Ω PRT/SPRT -200 0 660 -200 0 232 5 25 84 20 100 185 0.0085 0.0035 0.
riešenia na presné meranie 8508A Service Manual Read Rate and Additional Uncertainty Read Rate and Additional Uncertainty Function Resolution DCV, DCI & Ohms 8 7 6 5 6 [10] ACV & ACI [6] Filter Frequency (Hz) 5 ACV Transfer Off [6] PRT & Tru Ohms [14] 8 7 6 5 1 10 40 100 1 10 40 100 1 10 40 100 - Read Rate (readings/second) [13] Additional Errors ± (ppm Reading + ppm Range) Normal Fast Normal Fast 1/25 1/6 2 35 1/50 1/5 1/2 1 1/50 1/5 1/2 2 1/25 1/2.
riešenia na presné meranie Introduction and Specifications Applying the Specifications 1 Applying the Specifications Introduction The Fluke 8508A has been designed specifically for metrologists. Not only does it provide the performance metrologists need, but it is specified in a way to allow users to really understand the uncertainties of the measurements, and easily make allowance for those uncertainty contributions when performing measurement uncertainty analyses and compiling uncertainty budgets.
riešenia na presné meranie 8508A Service Manual Applying User’s Calibration Uncertainties When the 8508A is calibrated by another laboratory the uncertainties of the calibration standards used may be applied by combining those uncertainties with the 8508A’s Relative to Standards specifications. The applicable calibration uncertainties and the 8508A relative specifications must both be expressed at the same confidence level, and be combined in a RSS (Root Sum Square) summation.
riešenia na presné meranie Introduction and Specifications Applying the Specifications 1 Ratio Measurements The 8508A Ratio mode will automatically take measurements of inputs applied to the front and rear terminals and display the result as a ratio in the voltage and resistance functions. The measurements can be made on the same range or different ranges.
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riešenia na presné meranie Chapter 2 Theory of Operation Title Introduction.......................................................................................................... Overall Functional Description............................................................................ Main Assemblies ............................................................................................. Power Supplies ...............................................................................................
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riešenia na presné meranie Theory of Operation Introduction 2 Introduction This chapter provides a board-level theory of operation for the 8508A Reference Multimeter. Functional block diagrams supplement the text when appropriate. In addition to providing a conceptual overview of the Multimeter’s operation, the descriptions are helpful for troubleshooting and isolating problems to a board level.
riešenia na presné meranie 8508A Service Manual A3 Ohms PCA Input Select I to R Converter 2-Wire 4-Wire Range -15 V A2 AC PCA Input Select Range Selection Rectifier Input Select DC Preamp Input Select 10:1 I DC and I AC Lo-Pass Filter Output Buffer A1 DC PCA Range Selection DC V RMS Converter AC Preamp Internal Bus Input Signal Bus AC AC + DC DC AMP (Chopper Stabilized) A to D Converter (ADC) AD MUX In-guard Power Supplies 250 VAC +5 V +8 V +15 V –8 V +36 V Internal Reference Ra
riešenia na presné meranie Theory of Operation Overall Functional Description 2 A 16-pin cable (W3) enables serial control and measurement data to move between the A4 Digital PCA and the A1 DC PCA. Opto-isolators on the A1 DC PCA optically isolate the external control and display circuits of the Multimeter from the measurement circuits. This isolation minimizes problems associated with noise and current loops in the measurement circuits.
riešenia na presné meranie 8508A Service Manual measurement across the unknown resistor. Configuration relays on the A1 DC PCA perform the change in terminal connections between two- and four-wire measurements. The A3 Ohms PCA includes an alternative high-resistance measurement feature for resistance measurements above 20 MΩ. These measurements use 10 times the standard stimulus current and result in a 10 times increase in the voltage across the resistor.
riešenia na presné meranie Theory of Operation Overall Functional Description 2 T1 J150 J401 250 V ac to Ohms PCA J502 + +15 V regulator +15 V dc 15 V regulator -15 V dc - +17 V -18 V dc + - +36 V regulator +36 V dc 36 V regulator -36 V dc +8 V dc +5 V regulator +5 V dc In-guard Voltages Out-guard Voltages F1 T2 J501 Line Power +17 V regulator +17 V dc +8 V regulator +8 V dc +5 V regulator +5 V dc avw004f.eps Figure 2-2. Power Supplies - Simplified Block Diagram http://www.
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riešenia na presné meranie Chapter 3 Calibration and Verification Title Introduction.......................................................................................................... Calibration Overview........................................................................................... Calibration Interval and Performance .................................................................. Calibration Points ...................................................................................
8508A Service Manual riešenia na presné meranie Applicable Verification Tolerance and Conditions ......................................... Preparation....................................................................................................... DC Voltage Checks ......................................................................................... AC Voltage Checks ......................................................................................... Resistance Checks ......................
riešenia na presné meranie Calibration and Verification Introduction 3 Introduction This chapter describes the calibration menus, and lists the calibration and performance verification procedures for the Multimeter. Remote commands for calibration of the Multimeter are described in Chapter 4 of the Users Manual, Remote Operations using the IEEE 488 Interface. In this chapter, menu and button selections are shown as all-caps text.
riešenia na presné meranie 8508A Service Manual Non-Nominal Values The Set facility allows the user to set the calibration target to the value of the calibration source available. This facility is most useful when the user’s calibration source is not available at the nominal values specified, or when the user has knowledge of the actual output of the calibration source at the required points.
riešenia na presné meranie Calibration and Verification Calibration Menus 3 This menu defines four menu keys: Auto Indicates to the user that the calibration point is automatically set according to the amplitude (and frequency in ACV) of the signal detected. Auto is the default selection on entry to the CALIBRATION menu. Refer to the tables appearing later in this chapter for the calibration points for the selected range.
riešenia na presné meranie 8508A Service Manual SPOT CAL Menu This menu is obtained by pressing the Set key in the CALIBRATION menu when the Multimeter is in ACV Spot Frequency mode. It provides a means of calibrating the Multimeter at any of six user-specific spot frequencies, at non-nominal calibration values for each ACV range. The Multimeter will already be set to an ACV range on entry to the menu. adj140f.
riešenia na presné meranie Calibration and Verification Calibration Menus 3 ±10 % of the stored frequency is accuracy enhanced by reducing frequency response flatness errors. Calibrate the spot at a new frequency: To calibrate the spot at a new frequency, change the input signal to the desired new frequency and press SAMPLE as before. Quit Reverts to the SPOT CAL menu with the original Spot calibration intact.
riešenia na presné meranie 8508A Service Manual adj138f.eps SER# Menu The SER# menu provides the selection: Enter Stores the new serial number, de-activates the keyboard, and reverts to the SPCL menu. Quit Reverts to the SPCL menu, leaving the old serial number intact. Hvlin Menu This menu sequence is obtained by selecting Hvlin from the SPCL menu.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Non-volatile input-offset compensation adjustment is available only when the rear panel calibration keyswitch is in the ENABLE position and the CAL legend is not shown on the main display. Adjustment is performed by initiating an input zero operation with the Multimeter in this condition, using the INPUT menu as described in Chapter 3 or using the IEEE 488 input zeroing commands described in Chapter 4.
riešenia na presné meranie 8508A Service Manual used to provide calibration uncertainties to be combined with the 8508A Relative to Standards specifications to determine the achieved Multimeter performance after calibration. (RSS summation is recommended). See Chapter 5 for more details of combining 8508A Relative to Standards specifications and calibration uncertainties. Note The Multimeter should be thoroughly checked to ensure it is operating correctly before attempting calibration.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 3. Set the rear panel Calibration switch to Enable. Removal of any calibration sticker or integrity seal covering the calibration switch will be necessary. 4. Press the CAL key. 5. The CALIBRATION menu is displayed. The calibration menu appears, and the CAL legend appears on the main display.
8508A Service Manual riešenia na presné meranie configuration used by Fluke for Multimeter calibration. Figure 3-1 shows the interconnections used in detail. If alternate leads are substituted, make sure they are metrology grade leads, and of adequate voltage and current ratings. Leads should be kept as short as possible, constructed from low capacitance low leakage dielectric material (PTFE) with low thermal emf terminations, and exactly duplicate the configuration and interconnections shown.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Red Red Green Black White Blue Red Green Red White Link guard and ground terminal Black Blue CURRENT OUTPUT Link guard and ground terminal HI LO White CURRENT OUTPUT HI LO 8508A REFERENCE MULTIMETER 8508A-7000K PM 8508A - 7000K 4 W SHORT 4 10590 - A Green adj381f.eps Figure 3-1. Equipment Connections Required for Calibration http://www.elso.
riešenia na presné meranie 8508A Service Manual ADC Calibration ADC (analog to digital converter) calibration aligns the different resolutions available from the Multimeter’s analog to digital converter, so that there are no significant differences in readings when changing resolutions with a constant input value. It is recommended that ADC CAL is only performed if performance verification indicates significant resolution differences.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Range Zero and Gain Calibration Procedure After the initial setup and connecting up, use the following procedure to calibrate range zero, then positive and negative range gains on all DCV ranges. Just one range can be calibrated if required, but for a full calibration start with the 200 mV range and work up to the 1kV range, as shown in Table 3-3. Table 3-3.
riešenia na presné meranie 8508A Service Manual Range Gain Points 1. On the Calibrator, select the positive Range Gain point Output value. 2. On the Multimeter, Press CAL to revert to CALIBRATION menu. 3. Select Set on the CALIBRATION menu. 4. Use the numeric keys with the SET VALUE menu to key in the true output value of the calibrator at the range gain value, then press Enter. 5. Press SAMPLE to initiate the calibration operation.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Table 3-4.
riešenia na presné meranie 8508A Service Manual Resistance Calibration When calibrating the resistance function, each of the resistance modes (Normal, LoI, TruΩ, TruΩ LoI and HiVΩ) must be individually calibrated. The following procedure assumes use of a multifunction calibrator and calibrates each resistance mode in turn, range by range.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Initial Setup and Connections 1. Press the Ω key and select the 200 Ω range. 2. Press the CONFIG key and select Filt and 4wΩ. 3. In calibration mode the resolution defaults to RESL7 in the resistance function. It is recommended that this resolution is used for calibration of all resistance ranges. 4. Reselect Ω. 5.
8508A Service Manual riešenia na presné meranie Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed Range Gain Point 1. On the Calibrator, select the Range Gain point resistance value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance. (For the 2 GΩ range the 8508-7000K 1 GΩ standard resistor is used in place of the calibrator.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Zero Point 1. On the Multimeter, select the required range. 2. On the Calibrator, select zero Ω and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 MΩ and 2 GΩ ranges, de-select Ex SNS on the calibrator and de-select 4WΩ οn the Multimeter.) 3. On the Multimeter, press CAL to enter the CALIBRATION menu. 4.
8508A Service Manual riešenia na presné meranie Zero Point 1. On the Multimeter, select the required range. 2. On the Calibrator, select zero Ω and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. 3. On the Multimeter, press CAL to enter the CALIBRATION menu. 4. Press SAMPLE to initiate the calibration operation. Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed. Range Gain Point 1.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Zero Point 1. On the Multimeter, select the required range. 2. On the Calibrator, select zero Ω and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. 3. On the Multimeter, press CAL to enter the CALIBRATION menu. 4. Press SAMPLE to initiate the calibration operation. Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
8508A Service Manual riešenia na presné meranie For the 2 GΩ range use the 1 GΩ standard resistor in place of the calibrator. To avoid the requirement for a 10 GΩ standard, the 20 GΩ range is automatically calibrated when the 2 GΩ range gain calibration is triggered. It is also necessary for the 100 MΩ and 1 GΩ NormalΩ ranges to be calibrated prior to the 2 GΩ HiVΩ range for the result to be valid.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 5. Press SAMPLE to initiate the calibration operation. Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed. 6. On the Calibrator, set STANDBY. 7. Press the Ω key to revert to the ranges menu. DC Current Calibration XW Warning The Calibrator can deliver a lethal electric shock.
riešenia na presné meranie 8508A Service Manual Table 3-6.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Range Gain Points 1. On the Calibrator, select the positive Range Gain point Output value. 2. On the Multimeter, Press CAL to revert to CALIBRATION menu. 3. Select Set on the CALIBRATION menu. 4. Use the numeric keys with the SET VALUE menu to key in the true output value of the calibrator at the range gain value, then press Enter. 5. Press SAMPLE to initiate the calibration operation. 6.
riešenia na presné meranie 8508A Service Manual Table 3-7. AC Current Calibration Points and Sequence 8508A Range 200 μA Point 20 mA 200 mA 2A 20 A Frequency 10 μA 300 Hz 100 μA 300 Hz Zero (0.5 % Range) 10 μA 300 Hz Range Gain 1 mA 300 Hz Zero (0.
riešenia na presné meranie Calibration and Verification Routine Calibration 3 Alternatively, the 1MHz frequency reference may be used directly as an input signal for the Multimeter for frequency calibration. Initial Setup and Connections 1. Press the ACV key, select the 2 V range. 2. Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the Ext Grd legend does not appear on the left-hand display. 3.
8508A Service Manual riešenia na presné meranie 6. Press the CONFIG key and select Filt, LoI and 4wΩ. Repeat steps 3 and 4. 7. Press the CONFIG key and select 2wΩ. Repeat steps 3 and 4. 8. Press the CONFIG key, select 4wΩ and de-select LoI. Repeat steps 3 and 4. 9. Press the CONFIG key and select 2wΩ. Repeat steps 3 and 4. 10. Press the ΩPLUS key and select TruΩ. From the TruΩ menu the 2Ω range. 11. Press the CONFIG key and select Filt and LoI. Repeat steps 3 and 4. 12.
riešenia na presné meranie Calibration and Verification Performance Verification 3 To Calibrate at Spot Frequencies Spot Calibration is available only when in AC Voltage function with Spot already selected on the ACV CONFIG menu. Each spot (six per range) can be calibrated at a valid input frequency to a non-nominal RMS value. In subsequent use, frequency response flatness errors are reduced within ±10 % of the calibrated spot frequency.
8508A Service Manual riešenia na presné meranie Equipment Requirements The equipment required for performance verification of the Multimeter is identical to the equipment required for routine calibration listed in Table 3-1. Alternate equipment may be used, but users should ensure it provides adequate uncertainties, and consider the impact of those uncertainties on allowable tolerance limits.
riešenia na presné meranie Calibration and Verification Performance Verification 3 * Fluke guarantees the Multimeter’s performance verification using specifications stated to 99 % confidence level. Preparation 1. Allow the Multimeter to warm-up under power in the specified environment for at least 4 hours. 2. Press the CLEAR key, select Pwr Up Dflt to restore the power up default configuration and display the DCV menu. 3. Press the Test key and select Std to initiate a selftest.
riešenia na presné meranie 8508A Service Manual 5. Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output. 6. On the calibrator select the value required for verification in the negative polarity. 7. Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output. 8.
riešenia na presné meranie Calibration and Verification Performance Verification 3 AC Voltage Checks XW Warning The Calibrator can deliver a lethal electric shock. To avoid electric shock when performing the following calibration procedures: • Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present. • Make sure that signal leads are in a safe condition before you handle them in any way. Equipment Configuration 1.
riešenia na presné meranie 8508A Service Manual Table 3-9. AC Voltage Verification Points and Sequence 8508A Range 200 mV 2V 20V 3-36 Voltage Frequency 8508A Filter Tolerance 1 100 mV 20 Hz 10 Hz ± 0.0195 mV 100 mV 55 Hz 40 Hz ± 0.0175 mV 100 mV 1 kHz 100 Hz ± 0.0149 mV 100 mV 3 kHz 100 Hz ± 0.0175 mV 100 mV 10 kHz 100 Hz ± 0.0175 mV 100 mV 30 kHz 100 Hz ± 0.0445 mV 100 mV 60 kHz 100 Hz ± 0.0995 mV 100 mV 100 kHz 100 Hz ± 0.0995 mV 1V 20 Hz 10 Hz ± 0.
riešenia na presné meranie Calibration and Verification Performance Verification 3 Table 3-9. AC Voltage Verification Points and Sequence (cont) 8508A Range 200V 1000 V [1] 8508A Filter Tolerance [1] Voltage Frequency 100 V 20 Hz 10 Hz ± 0.0144 V 100 V 55 Hz 40 Hz ± 0.0119 V 100 V 1 kHz 100 Hz ± 0.0099 V 100 V 3 kHz 100 Hz ± 0.0119 V 100 V 10 kHz 100 Hz ± 0.0119 V 100 V 30 kHz 100 Hz ± 0.0295 V 100 V 60 kHz 100 Hz ± 0.0795 V 100 V 100 kHz 100 Hz ± 0.
riešenia na presné meranie 8508A Service Manual Procedure Perform the following sequence for each resistance mode and each range, as listed in Table 3-10, starting with the 2 Ω range and working up to the 2 GΩ range for the NormalΩ and NormalΩ LoI resistance modes. Then continue the sequence for the TruΩ and TruΩ LoI modes, starting with the 2 Ω range and working up to the 20 kΩ range. Finally complete the sequence for the HiVΩ mode, starting with the 20 MΩ range and working up to the 20 GΩ range.
riešenia na presné meranie Calibration and Verification Performance Verification 3 10. Press the Ω key. 11. Press the CONFIG key and select Filt , RESL7, 4wΩ, and LoI. 12. Repeat steps 3 – 9 for the NormalΩ LoI ranges. 13. Press the Ω Plus key and select TruΩ. 14. Press the CONFIG key and select Filt , RESL7, and 4wΩ. Ensure LoI is deselected. 15. Repeat steps 3 – 9 for the TruΩ ranges. 16. Press the Ω Plus key and select TruΩ. 17. Press the CONFIG key and select Filt , RESL7, 4wΩ, and LoI. 18.
riešenia na presné meranie 8508A Service Manual Table 3-10. Resistance Verification Points and Sequence (cont) 8508A Range Resistance Tolerance 1 HiVΩ2 20 MΩ 200 MΩ 2 GΩ 20 GΩ 0 GΩ Perform input zero operation to calibrator range locked zero output 10 MΩ ± 0.0000202 MΩ 0 GΩ Perform input zero operation to calibrator range locked zero output 100 MΩ ± 0.0000870 MΩ 0 GΩ Perform input zero operation to calibrator range locked zero output 1 GΩ ± 0.
riešenia na presné meranie Calibration and Verification Performance Verification 3 6. On the calibrator select the value required for verification in the negative polarity. 7. Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output. Table 3-11.
riešenia na presné meranie 8508A Service Manual Procedure Repeat the following sequence for each range, starting with the 200μA range and working up to the 20A range, as listed in Table 3-12. 1. Select the required Multimeter range. 2. On the calibrator set the output to the current and frequency for the point being verified as listed in Table 3-12. Set the output to OPERATE. 3. Note the Multimeter’s reading.
riešenia na presné meranie Calibration and Verification Performance Verification 3 Frequency Checks Equipment Configuration 1. Ensure that the calibrator output is set to STANDBY and configured for Internal Guard (EXT GRD is deselected). 2. Connect the equipment as described for Routine Calibration. 3. Press the ACV key, select the 2V range 4. Press the CONFIG key. Select Tfer On, Filt 40Hz. 5.
8508A Service Manual 3-44 riešenia na presné meranie http://www.elso.
riešenia na presné meranie 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.
riešenia na presné meranie 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.
riešenia na presné meranie Chapter 4 Maintenance Title Introduction.......................................................................................................... Access Procedures ............................................................................................... Before You Start.............................................................................................. Cabling and Wiring Connections ....................................................................
8508A Service Manual 4-2 riešenia na presné meranie http://www.elso.
riešenia na presné meranie Maintenance Introduction 4 Introduction This chapter contains access procedures for replaceable assemblies (PCAs) and error messages assocated with the self-test procedure. All of the access procedures describe how to remove a PCA or assembly. In all cases, unless otherwise noted, the reassembly/replacement procedure is a logical reversal of the removal procedure.
riešenia na presné meranie 8508A Service Manual Cabling and Wiring Connections To help avoid making incorrect cable connections during reassembly, refer to the internal wiring and cabling diagram shown in Figure 4-1.
riešenia na presné meranie Maintenance Access Procedures 4 Removing the A1 DC PCA Use the following procedure to remove the A1 DC PCA. See Figure 4-2. 1. Position the unit on the work surface so it is bottom-side up. 2. Remove both rear feet A. a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the bottom cover B. a. Remove the one philips screw at rear of the bottom cover. b. Slide the cover toward the back of the unit, and lift it off.
riešenia na presné meranie 8508A Service Manual Removing the A2 AC PCA Use the following procedure to remove the A2 AC PCA. See Figure 4-3. 1. Position the unit on the work surface so it is top-side up. 2. Remove both rear feet. A a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the top cover. B a. Remove the one philips screw at rear of the top cover. b. Slide the cover toward the back of the unit, and lift it off. 4.
riešenia na presné meranie Maintenance Access Procedures 4 Removing the A3 Ohms PCA Use the following procedure to remove the A3 Ohms PCA. See Figure 4-4. 1. Position the unit on the work surface so it is bottom-side up. 2. Remove both rear feet. A a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the bottom cover. B a. Remove the one philips screw at rear of the bottom cover. b.
riešenia na presné meranie 8508A Service Manual Removing the A4 Digital PCA Use the following procedure to remove the A4 Digital PCA. See Figure 4-5. 1. Position the unit on the work surface so it is top-side up. 2. Remove both rear feet. A a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the top and bottom covers. BC a. Remove one philips screw at rear of each cover. b. Slide the covers toward the back of the unit, and lift them off. 4.
riešenia na presné meranie Maintenance Access Procedures 4 Removing the A5 Bezel Assembly Use the following procedure to remove the A5 Bezel Assembly. See Figure 4-6. 1. Position the unit on the work surface so it is bottom-side up. 2. Remove both rear feet. A a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the bottom cover. B a. Remove one philips screw at rear of the bottom cover. b.
riešenia na presné meranie 8508A Service Manual Removing the A5A1 Display PCA Use the following procedure to remove the A5A1 Display PCA. See Figure 4-7. 1. Remove the A5 Bezel Assembly (described earlier in this chapter). 2. Remove the seven small self-threading Philips screws holding the A5A1 Display PCA to the plastic bezel (front panel). A 3. Lift the top of the A5A1 Display PCA until it clears the lip of the bezel, and then pull the A5A1 Display PCA toward the lip of the plastic bezel.
riešenia na presné meranie Maintenance Access Procedures 4 Removing the A6 Rear Input Assembly Use the following procedure to remove the A6 Rear Input Assembly. See Figure 4-8. 1. Position the unit on the work surface so it is bottom-side up. 2. Remove both rear feet. A a. Remove the three hex screws from each foot. b. If the feet are still in place, pull them from the unit. 3. Remove the top and bottom covers. BC a. Remove the one philips screw at the rear of each of the covers. b.
riešenia na presné meranie 8508A Service Manual Fuse Replacement and Line-Voltage Selection WCaution To avoid fire hazard, use only the fuse arrangements that appear in the fuse specification Tables 4-1 and 4-2 below. Additionally, the supply network must be fused at a maximum of 16 A, and if the power cable plug is internally fused, a 5 A fuse must be fitted in the power cable plug. To avoid shock hazards, disconnect all line-power and input terminal connections before attempting to access the fuse(s).
riešenia na presné meranie Maintenance Self Test 4 Rear-Input Current Fuse F2 (Rear Inputs Option) The rear input option includes a fuse (F2) to limit the current at the rear-input A terminal to 2A. The fuse is located at the rear of the Multimeter just to the left of the current input terminal (A). A half-twist of the fuse cap releases the fuse for inspection or replacement. Use the fuse specified in Table 4-2 when replacement is necessary. Table 4-2.
riešenia na presné meranie 8508A Service Manual Test No 28 Err 2281 P011 10V Range Positive Gain Check Test No 29 Err 2291 P012 10V Range Negative Gain Check Test No 30 Err 2301 P013 100V Range Positive Gain Check Test No 31 Err 2311 P014 100V Range Negative Gain Check DC CURRENT Test No 40 Err 2401 P032 100ųA DC Range: Zero Input Check Test No 41 Err 2411 P033 100ųA DC Range: 100ųA Input Gain Check Test No 42 Err 2421 P034 1mA DC Range: Zero Input Check Test No 43 Err 2431 P
riešenia na presné meranie Maintenance Self Test 4 AC VOLTS Test No 80 Err 2801 P015 100mV AC Range: Zero Input Check Test No 81 Err 2811 P016 100mV AC Range: +179mV DC Input Checks at PreAmp Output Test No 82 Err 2821 P017 100mV AC Range: -179mV DC Input Checks at PreAmp Output Test No 83 Err 2831 P018 1V AC Range: Zero Input Check 2832 raw Test No 84 Err 2841 P019 1V AC Range: +993mV DC Input Checks at PreAmp Output Test No 85 Err 2851 P020 1V AC Range: -993mV DC Input Checks at
riešenia na presné meranie 8508A Service Manual Fatal Errors Fatal errors are reported only via the front panel display. These messages are all coded as 9000 series faults. Each of the fatal errors that might occur are identified in the following paragraphs. When a fatal error occurs the processor halts the operation of the multimeter. Cycling the power off and on may clear the message.
riešenia na presné meranie 9005 Serial Interface Fault Maintenance Self Test 4 Addr id When this fatal error occurs the system will continuously try to repeat whatever it was doing - the user interface will be inoperative. See Tabe 4-6 for descriptions of the serial interface errors. Table 4-6. Serial Interface Errors id Fault 01 Phase Error The phase counter is either out of range for the current sequence or an interrupt from the serial interface or delay timer occurred the other was expected.
riešenia na presné meranie 8508A Service Manual 9006 - Serial Loop Mismatch xxxxxxxx id xxxxxxxx is the actual data received in binary format. See Table 4-7 for descriptions of the serial loop mismatch errors. Table 4-7.
riešenia na presné meranie Maintenance Self Test 4 Table 4-8.
riešenia na presné meranie 8508A Service Manual Table 4-9.
riešenia na presné meranie Chapter 5 List of Replaceable Parts Title Page Introduction.......................................................................................................... How to Obtain Parts............................................................................................. How to Contact Fluke .......................................................................................... Parts Lists..............................................................................
8508A Service Manual 5-2 riešenia na presné meranie http://www.elso.
riešenia na presné meranie List of Replaceable Parts Introduction 5 Introduction This chapter contains an illustrated list of replaceable parts for the 8508A Reference Multimeter to the board level only. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator.
riešenia na presné meranie 8508A Service Manual Parts Lists The following tables list the replaceable parts for the 8508A Reference Multimeter. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator.
riešenia na presné meranie List of Replaceable Parts Parts Lists 5 MP1 MP4 MP3 4 2 6 H1 6 MP2 H2 2 MP5 2 H3 4 MP6 2 MP7 MP8 3 MP9 MP10 avw025.eps Figure 5-1. 8508A Final Assembly http://www.elso.
8508A Service Manual riešenia na presné meranie Table 5-2.
riešenia na presné meranie A2 List of Replaceable Parts Parts Lists 8 5 H12 H2 6 MP3 H13 4 W2 AC PCA W4 A4 Ohms PCA Top View 2 H5 A1 MP4 H12 10 10 STICK OVER SMALL HOLES Bottom view DC PCA avw026f.eps Figure 5-2. 8508A Chassis Assembly http://www.elso.
riešenia na presné meranie 8508A Service Manual A1 T2 H2 2 T1 A5 DC PCA A401 Bottom view A401 4 H1 FORM RIBBON CABLES AS SHOWN AND CONNECT TO CONNECTORS ON REAR OF DISPLAY BOARD. W6 W5 WHITE & GREEN BLUE BROWN BLACK RED W1 avw027f.eps Figure 5-2. 8508A Chassis Assembly (cont) 5-8 http://www.elso.
riešenia na presné meranie H7 List of Replaceable Parts Parts Lists 5 H6 T2 H8 H9 H14 2 H10 H11 H3 H4 2 H6 H7 T2 W7 H10 2 H11 2 T1 H5 2 MP1 2 A4 W3 Digital PCA 7 MP2 NOT REQUIRED IF REAR INPUT FITTED 7 H2 avw028.eps Figure 5-2. 8508A Chassis Assembly (cont) http://www.elso.
8508A Service Manual riešenia na presné meranie Table 5-3.
riešenia na presné meranie List of Replaceable Parts Parts Lists 5 MP1 MP5 H2 7 A1 2 MP2 L1 4 H1 2 MP2 RED WIRE BLACK WIRES - FIT THIN WIRE UNDER THICK WIRE PINK WIRE BROWN WIRE BLUE WIRE WHITE WIRE H3 H6 ALL WIRES EXCEPT GREEN LOOP ONCE THROUGH FERRITE C1 C2 GREEN WIRE NOTE !! POSITION CAPACITOR AWAY FROM OTHER TERMINALS. H7 H4 12 6 H5 6 RED BLK RED BLK BLU RED J1 J2 J5 J3 J4 J6 MP4 MP3 W1 avw029f.eps Figure 5-3. A5 Bezel (front panel) Assembly http://www.elso.
8508A Service Manual riešenia na presné meranie Table 5-4. A6 Rear Input Assembly (optional) Reference Description Designator A1 C1, C2 WF1 FH H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 J2, J4 J1, J3, J5 J6 L1 W1 5-12 Fluke Tot Qty Part No Rear Input PCA Capicator CD 470 pF 10% 2 kV Fuse 1.6 A 250 V 20 mm Fuse Holder 20 mm Panel Mount Tie, Cable 3.
riešenia na presné meranie List of Replaceable Parts Parts Lists 5 H12 2 H8 H11 H9 H10 L1 8 wires with terminals H9 L1 2 GREEN WHITE BLACK ORANGE BLUE BROWN W1 RED A1 L1 ORANGE WIRE H6 H7 F1 GREEN WIRE FH1 ORANGE WIRE C1 C2 BLACK WIRE WHITE WIRE RED WIRE BLUE WIRE H3 12 H4 6 H5 6 H14 BROWN WIRE 6 H13 6 H2 6 J1, J3, J5 Red J2, J4 Black J6 Blue H1 L1 avw030f.eps Figure 5-4. Rear Input Assembly (optional) http://www.elso.
8508A Service Manual riešenia na presné meranie™ Elso Philips Service; tel: +421 32 6582410 email: elso@elso.sk; web: www.elso.
