Fluke 8020A Instruction Manual
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Fluke 8020A Instruction Manual

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  • Page 2 This manual documents the Model 8020A and its assemblies at the revision level shown in Appendix A. If your instrument contains assemblies with different revision letters, it will be necessary for you to either update or backdate this manual. Refer to the supplemental changelerrata sheet for newer assemblies, or to the Appendix A for older assemblies.
  • Page 3 It also provides some unique measurement capabilities in addition to those normally found in an ordinary multimeter. moments to read the manual. As always, Fluke stands behind your 8020A with a full one-year warranty and a worldwide service organization. If the need arises, please don't hesitate to call on us Thank you for your trust and confidence.
  • Page 4 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 Knowing that there is a problem. 2. Learning the guidelines for handling them. 3. Using the procedures, and packaging and bench techniques that are recommended.
  • Page 5 Anti-static bags, for storing S.S. devices or pcbs with these devices on them, can be ordered from the John Fluke Mfg. Co., Inc.. See section 5 in any Fluke technical manual for ordering instructions. Use the following part numbers when ordering these special bags.

  • Page 6: Table Of Contents

    Table of Contents SECTION TITLE PAGE INTRODUCTION AND SPECIFICATIONS INTRODUCTION PREPARING FOR OPERATION ........Unpacking Battery Installation GETTING ACQUAINTED Physical Features Initial Check-Out Procedure ........SPECIFICATIONS ......... OPERATING INSTRUCTIONS 2.10 INTRODUCTION 2. 3 OPERATING NOTES 2. 5 Input Power Display Readings 2.15 Input Connections to COMMON 2.17...
  • Page 7 SECTION TITLE PAGE ......... Access Information .......... Cleaning ......Battery/ Fuse Replacement PERFORMANCE TEST ........Initial Procedure ......Resistance/ Conductance Test DC Voltage Test AC Voltage Test ........CALIBRATION TROU BLESHOOI'ING ......5- 1 .
  • Page 8 List of I I lustrations TITLE PAGE FIGURE Controls. Indicators. Connectors 2. 1 Recommended Method for Removing Battery Cover Waveform Conversion 2. 2 Voltage Measurement Error Calculations ............. (Loading Error) Current Measurement Error Calculations (Burden Voltage Error) Conductance-to-Resistance Conversion Scales ..........
  • Page 9 List of Tables TABLE TITLE PAGE ........Controls. Indicators. Connectors ..................Summary of Input Overload Limits Resistance Ranges and Their Voltage/ Current ............Capability ........List of Recommended Test Equipment ........Resistance/ Conductance Checks ....................DC Current (mA) Checks ..........

  • Page 10: Introduction

    John Fluke Service Center as listed at the rear of this manual. Please retain. and use the shipping container if Up to 200 hours of continuous operation can be reshipment is required.

  • Page 11: Battery Installation

    1-7. To install the battery, locate the battery- compartment cover on the bottom of the 8020A, and 1-10. Physical Features using both thumbs slide it away from the case screw to expose the battery compartment.
  • Page 12 Set the power switch to O N and observe the settings, and test lead connections before contacting display. I t should read 00.0 0.1. your nearest authorized John Fluke Service Center. Connect the red test lead to the V / K n input NOTE terminal.
  • Page 13 M R range switches. This selects the 200 nS Look inside of the battery eliminator connector range. The display should read 00.0 to 01.0 on the right side of the 8020A and locate the (minimum conductance, maximum resistance). connector contacts (center post and side contact Touch the red probe tip t o the COMMON input as shown in Figure 1-1).

  • Page 14: Specifications

    Table Specifications (Contlnued) 1-2. 8020A AC VOLTS ......200 mV, 2V, 20V, 200V, 750 rms Ranges Accuracy See table ....10 Mf2, capacitance <I00 pF, all ranges Input Impedance ..Overvoltage Protection 200 mV range; 15 seconds max over 300V ac.
  • Page 15 Display reads BT when battery voltage drops below 7.2 volts, typically. Approximately 20% of battery life remains. Battery Eliminator .Fluke Model A-81. Available as an accessory. Specify local line voltage. WEIGHT 1.8 x 3.4 x 7.1 inches (H x W x L)

  • Page 16: Operating Instructions

    200 hours can be expected. Carbon-zinc batteries will have a useful life of up to 150 hours. In either event the 8020A will display a BT (in upper left-hand corner) when the battery has exhausted approximately 80% if its useful life.

  • Page 17: Display Readings

    This will most likely be seen in the automatically disconnected to conserve battery life. The ohms mode as the open circuit test leads are A81 connects to the 8020A through a recessed, side-panel applied to an in-range resistance value. Ifthe jack.

  • Page 18: Fuse Replacement

    2-25. 200 kn, COMMON on the 8020A; 20 Mfl, 2000 kfl, 200 kfl, 20 kfl, 2 kfl and 200.fl. All scales employ a two wire measurement technique. As a result, test lead resistance may influence measurement accuracy on the 200fl range. To determine...
  • Page 19 Six direct reading resistance scales are provided 200 k n , COMMON on the 8020A; 20 MR, 2000 kR, 200 kR, 20 kR, 2 kR 2000 kQ20 M n 200 nS, 2 mS and 200R. All scales employ a two wire measurement technique.

  • Page 20: Resistance

    2-28. The 8020A is equipped with five ac and five dc on the 8020A; 2 mA, 20 mA, 200 mA and 2000 mA. voltage ranges; 200 mV, 2V, 20V, 200V, 750V ac/ lOOOV Each range is diode protected to 2 amps and fuse...

  • Page 21: Conductance

    Increase displayed current by 3.89% to obtain true current. 2-34. The conductance ranges, 200 nS and 2 mS, are included on the 8020A for making both conductance Error in amps and resistance measurements. When either range is 13.48 selected the display reads the measurement results in increase displayed current by 0.058A t o...

  • Page 22: Operation

    2-37. OPERATION 2-38. Operation of the 8020A is an easy four step process: Set the power switch to ON. With reference to Figure 2-6, set the range and function switches for the desired measurement.

  • Page 23: Transistor Tester

    Select the 2 mS range, plug the fixture shown in Figure 2-7 into the V/KR and COMMON input An open transistor will read 0.001 or less. terminals, and you have transformed your 8020A into a transistor tester. Now, plug a transistor into the test 2-44.

  • Page 24: Leakagetester

    (pcb's), etc. In all cases the test voltage is <5V If the capacitor is polarity sensitive (electro- lytic, etc.), identify the positive side and connect it to the 8020A's V / k R input. Connect the 2-48. RESISTIVE COMPONENTS negative side to COMMON.

  • Page 25: Introduction

    Peripherals to U8 include range and 3-3. OVERALL FUNCTIONAL function switches, input signal conditioners, and the display., When an input signal is applied to the 8020A, it DESCRIPTION is routed through the range switches to one-of-four 3-4. The Model 8020A, as shown in Figure 3-1, is a input signal conditioners as determined by the function hand-held six function digital multimeter.

  • Page 26: Block Diagram Analysis

    3-6. Timing for the overall operation of the a/d determines the length of both time periods by providing converter is derived from an external quartz crystal an overflow at the end of every 10,000 clock pulses. The whose frequency is selected to be a multiple of the local read period is a variable time which is proportional to the line frequency.
  • Page 27 DIGITAL CONTROL LOGIC INTEG. READ 10,000 COUNTER OUTPUT 166.7 mS 5 00 1000 1500 2000 TEN LINE CYCLES FOR OPTIMUM COMMON MODE AND NORMAL MODE REJECTION Figure 3-2. Dual Slope AID Converter One is a reference voltage and the other a n unknown dc the divider output is ac coupled t o an active full-wave voltage within the range of -0.2 to +0.2V dc.
  • Page 28 input current is ac and the AC function is selected, the present during a voltage measurement is replaced by the I-R drop is rectified by the ac converter before going to voltage drop across the reference resistor. This allows the low-pass filter. In either event the a / d converter the voltage across the unknown resistor to be read receives a dc input voltage proportional to the current during the integrate period, and compared against the...

  • Page 29: Maintenance

    Contact your nearest authorized Fluke Technical Service Center for a 4-4. The 8020A is warranted for a period of I-year cost quotation. Ship instrument and remittance using the upon delivery to the original purchaser. Conditions of instructions given at the end of this manual.

  • Page 30: General Information

    CALIBRATION ACCESS the right until it clears the shelf under the buttons, and then lift up. 4-10. Use the following procedure to access the 8020A calibration adjustments. To reassemble logically reverse this procedure. Set the power switch to OFF. Disconnect test leads and battery eliminator if NOTE attached.

  • Page 31: Cleaning

    4-15. L S I ( ~ 8 ) ACCESS 4-16. Use the follow~ng procedure to remove/replace WARNING the A I D Converter and Display Driver IC, U8. ONLY BE PERFORMED AFTER THE TEST R e m o v e t h e p c b a s s e m b l y u s i n g t h e LEADS HAVE BEEN REMOVED FROM THE component/ pcb access procedure.

  • Page 32: Resistance/Conductance Test

    1.999 (calibrator ground/common/low to 8020A). 100 Hz 1.884 1.916 100 Hz 18.84 19.16 With reference t o Table 4-3 select the 8020A 5 kHz 18.00 19.99 2 kHz voltage range given in step 1, and set the 200V 186.9 193.1...

  • Page 33: Dc Current Test

    190.0 (an occasional flash of acceptable). Execute and verify steps 2 through 4 of Table 4-5 Select the 2VAC range on the 8020A and set the using the procedure described in step c. ac calibrator output to 1.9V at 5 kHz.

  • Page 34: Troubleshooting Guide

    4-40. A troubleshooting guide for the 8020A is given Use static ground straps to discharge repair in Table 4-6. To properly use the guide complete the personnel. performance test given earlier in this section and note any discrepancies. Then locate the heading of the...

  • Page 35: List Of Replaceable Parts

    5-5. Components may be ordered from the nearest Reference Designation or Item Number. Fluke authorized service center listed at the rear of this manual. To ensure prompt and efficient handling of your order, include the following information. Description of each part.
  • Page 37 Table 5-2. 8020A PCB Assembly...
  • Page 38 Figure 5-1. 5/78...
  • Page 39 Table 5-3.8020A PCB Subassemblv FLUKE MFG PART. STOCK DESCRIPTION SPLY NO. OR TYPE ITEM AR 1 IC, dual op amp 89536 Cap, var, 0.3 to 1.8 pF 72982 Cap, mylar, 0.022 pF +lo%, 1000V 89536 C3, C l l Cap, Ta, 10 pF +20%, 15V...
  • Page 40 FLUKE MFG PART. TOT REC USE DESCRIPTION STOCK ITEM 109793 01121 Res, comp, 1M +lo%, 1W 447730 89536 447730 Res, var, 500 160937 01121 Res, comp, 220k +5%, 1/4W 148106 01121 Res, comp, lOk +5%, 1 /4W 446849 89536 446849...
  • Page 41 The C90 Deluxe Carrying Case is a pliable, vinyl, zi pp er-closed pouch that provides in-field-transport protection for the 8020A as well as convenient storage locations for test leads, operator's guide and other small accessories. A finger-or belt-loop is included on the case as a carrying convenience.
  • Page 42 The 80T-150 Temperature Probe converts the 6-17. The Model 80K-40 extends the voltage measure- ment capability of the 8020A up to 40 kV. Internally, the thermometer. It is ideally suited for surface, ambient and probe contains a special 1000: 1 resistive divider. Metal-...
  • Page 48 Crystal, 3.84 MHz (60 Hz); 447615; 89536; 447615 does not contain one, contact your nearest sales repre- sentative. Be prepared to provide him with the revision On the 8020A schematic, Figure 7-1, change the value of letter of your instrument. resistor R8 from 220k to 180k.

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