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8842a instruction manual
1
1
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269 pages, 13.24 Mb
®
8842A
Digital Multimeter
Instruction Manual
PN 8793
0
9
Date December 1
9
91
Re
v
.3 7/96
© 1999 Fluke Corporation, A
l
l rights reserved
.
Printed in
U
SA
All product n
a
mes
a
re t
r
ad
e
marks of their
r
espective com
p
anies.
Contents
Main
Page
Table of Contents
Page
Page
Page
Page
8842A
List of Tables
Page
List of Figures
Page
Page
Page
Page
1-1. INTRODUCTION
1-2. THE 8842A DIGITAL MULTIMETER
1-3. OPTIONS AND ACCESSORIES
1-3
1-4. SPECIFICATIONS
Specifications for the 8842A are given in Table 1-1. External dimensions are shown in Figure 1-1.
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
Chapter 2
Operating Instructions
2-1. INTRODUCTION
2-2. INSTALLATION
2-3. Installing the Power-Line Fuse
2-4. Connecting to Line Power
2-5. Adjusting the Handle
2-6. Rack Mounting Kits
2-7. OPERATING FEATURES
2-8. Power-Up Features
2-9. Front and Rear Panel Features
2-5
Figure 2-5. Front Panel Features
2-6
Figure 2-5. Front Panel Features (cont)
2-7
Figure 2-6. Rear Panel Features
2-10. Display Features
2-11. Error Messages
2-9
2-12. Overrange Indication
2-13. Diagnostic Self-Tests
2-14. Ranging
2-15. AUTORANGE
2-16. MANUAL RANGE
2-17. Triggering
2-18. CONTINUOUS TRIGGER MODE
2-19. EXTERNAL TRIGGER MODE
2-20. Reading Rates and Noise Rejection
2-21. Automatic Settling Time D elay
2-22. External Trigger Input (Option -05 Only)
2-23. Sample Complete Output (Option -05 Only)
2-24. MAKING MEASUREMENTS
2-25. Input Overload Protection Limits
2-26. Measuring Voltage and Resistance
2-27. Measuring Current
2-28. Current Fuse Protection
2-29. Offset Measurements
2-30. EXTERNAL CLEANING
Page
Chapter 3
Remote Programming
Page
3-1. INTRODUCTION
3-2. CAPABILITIES
3-3. BUS SET-UP PROCEDURE
3-4
A D D R E S S
3-4. AN OVERVIEW OF REMOTE OPERATION
Page
3-5. A NOTE ABOUT EXAMPLES
3-6. DEVICE-DEPENDENT COMMAND SET
Remote Programming DEVICE-DEPENDENT COMMAND SET
Figure 3-4. Commands Which Correspond to the Front Panel
3-7
3-8
Y1 Blank Display P3 < 16 ASCII characters> Figure 3-5. Device-Dependent Command Set
3-7. Bn (Offset Commands)
3-8. Cn (Calibration Commands)
3-9. Dn (Display Commands)
3-10. Fn (Function Commands)
3-11. Get Commands
Remote Programming DEVICE-DEPENDENT COMMAND SET
3-11
3-12. G0 (Get Instrument Configuration)
3-13. G1 (Get SRQ Mask)
3-14. G2 (Get Calibration Prompt)
3-15. G3 (Get User-Defined Message)
3-16. G4 (Get Calibration Status)
3-17. G5 (Get IAB Status)
3-18. G6 (Get YW Status)
3-19. G7 (Get Error Status)
3-20. G8 (Get Instrument Identification)
3-21. N (Numeric Entry Command)
3-22. Put Commands
3-23. P0 (Put Instrument Configuration)
3-24. P1 (Put SRQ Mask)
3-25. P2 (Put Calibration Value)
3-26. P3 (Put User-Defined Message)
3-27. Rn (Range Commands)
3-28. Sn (Reading Rate Commands)
3-29. Tn (Trigger Mode Commands)
3-30. Wn (Terminator Commands)
3-31. X0 (Clear Error Register Command)
3-32. Yn (Suffix Commands)
3-33. Z0 (Self-Test Command)
3-34. (Device-Clear Command)
3-36. INPUT SYNTAX
3-37. Definitions
3-38. Input Processing
3-22
3-39. Syntax Rules
3-40. OUTPUT DATA
3-41. Loading Output Data
3-42. Types of Output Data
3-43. Numeric Data and Error Messages
3-44. MEASUREMENT DATA
3-45. OVERRANGE INDICATION
3-46. ERROR MESSAGES
3-47. Status Data
3-48. Output Priority
3-49. SERVICE REQUESTS
3-50. The Serial Poll Register
3-28
3-51. The SRQ Mask
3-52. INTERFACE MESSAGES
3-53. Address Messages
3-54. Universal Commands
3-55. Addressed Commands
3-56. TALK-ONLY MODE
3-57. REMOTE CALIBRATION
3-58. TIMING CONSIDERATIONS
3-59. IMMEDIATE MODE COMMANDS
3-32
Table 3-3. Immediate-Mode Commands for Various Controllers
3-60. EXAMPLE PROGRAMS
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Chapter 4
Measurement Tutorial
4-1. INTRODUCTION
4-2. DC VOLTAGE MEASUREMENT
4-3. Circuit Loading Error
4-4. Input Bias Current Error
4-5. RESISTANCE MEASUREMENT
4-6. 2-Wire Ohms
4-7. Correcting for Test Lead Resistance in 2-Wire Ohms
4-8. 4-Wire Ohms
4-6
4-9. Applications of the Ohms Functions
4-10. TESTING DIODES
4-11. TESTING ELECTROLYTIC CAPACITORS
4-12. A PRECISION CURRENT SOURCE
4-13. DC CURRENT MEASUREMENT
4-14. REDUCING THERMAL VOLTAGES
4-15. AC VOLTAGE AND CURRENT MEASUREMENT
4-16. True RMS Measurement
4-17. Waveform Comparison
Page
4-18. Crest Factor
4-19. AC-Coupled AC Measurements
4-20. Combined AC and DC Measurements
4-21. Bandwidth
4-22. Zero-Input VAC Error
4-23. MAKING ACCURATE MEASUREMENTS ON THE 20 mV AND 20
RANGES
4-24. MAKING ACCURATE HIGH-RESISTANCE MEASUREMENTS
Page
Chapter 5
Theory of Operation
Page
5-1. INTRODUCTION
5-2. OVERALL FUNCTIONAL DESCRIPTION
5-3. DETAILED CIRCUIT DESCRIPTION
5-4. DC SCALING
Page
5-5. VDC Scaling
5-6. VDC Protection
5-7. mA DC Scaling
5-8. Analog Filter
5-9. TRACK/HOLD CIRCUIT
Page
Page
5-11. Settling Configuration
5-12. Hold Configuration
5-13. Pre-Charge Configuration
5-14. PRECISION VOLTAGE REFERENCE
5-15. OHMS CURRENT SOURCE
5-16. OHMS PROTECTION
5-17. OHMS FUNCTIONS
5-18. 2-Wire Ohms
Page
5-19. 4-Wire Ohms
5-20. A/D CONVERTER
Page
5-21. Timing/Data Control
5-22. Precision DAC
5-23. A/D Amplifier
5-24. Bootstrap Supplies
5-25. DISPLAY
5-26. KEYBOARD
5-27. DIGITAL CONTROLLER
Page
5-28. In-Guard Microcomputer
Page
5-29. Function and Range Control
5-30. A/D Control and Computation
5-31. Calibration Correction
5-32. Keyboard/Display Control
5-33. Troubleshooting Modes
5-35. GUARD CROSSING
5-36. POWER SUPPLY
5-37. IEEE-488 INTERFACE (OPTION -05)
5-38. Out-Guard Microcomputer
5-39. Guard Crossing
5-40. Bus Interface Circuitry
5-41. Signal Conditioning
5-43. TRUE RMS AC (OPTION -09)
5-44. VAC Scaling
5-45. mA AC Scaling
5-46. Frequency Response Trimming
5-47. True RMS AC-to-DC Conversion
static awareness
A Message From
Fluke Corporation
Page
Chapter 6
Maintenance
Page
6-1. INTRODUCTION
6-2. PERFORMANCE TEST
6-3. Diagnostic Self-Tests
6-4. DC Voltage Test
6-6
6-5. AC Voltage Test (Option -09 Only)
6-6. Resistance Test
PERFORMANCE TEST
6-9
6-7. DC Current Test
6-8. AC Current Test (Option -09 Only)
6-9. CALIBRATION
6-10. Basic Calibration Procedure
6-11. INITIAL PROCEDURE
6-12. A/D CALIBRATION
Page
6-13. OFFSET AND GAIN CALIBRATION
6-14. HIGH-FREQUENCY AC CALIBRATION
6-15. Advanced Features and Special Considerations
6-16. STORING VARIABLE INPUTS
6-17. CALIBRATING INDIVIDUAL RANGES
6-18. VERIFYING CALIBRATION
6-19. ERASING CALIBRATION MEMORY
6-20. TOLERANCE CHECK
6-21. AC CALIBRATION AT OTHER FREQUENCIES
6-22. OPTIMIZING USE OF THE 5450A
6-23. Remote Calibration
CALIBRATION
6-21
Page
CALIBRATION
6-23
6-24. TIMING CONSIDERATIONS
6-25. REMOTE ERASURE
6-26. EXAMPLE CALIBRATION PROGRAM
6-27. DISASSEMBLY PROCEDURE
6-28. Case Removal
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6-29. True RMS AC PCA Removal (Option -09 Only)
6-30. IEEE-488 Interface PCA Removal (Option -05 Only)
6-31. Main PCA Removal
Page
6-32. Front Panel Disassembly
6-33. REASSEMBLY PROCEDURE
Page
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6-34. INTERNAL FUSE REPLACEMENT
6-35. EXTERNAL TRIGGER POLARITY SELECTION (Option - 05 Only)
6-36. TROUBLESHOOTING
6-37. Initial Troubleshooting Procedure
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6-38. Diagnostic Self-Tests
6-39. Self-Test Descriptions
Page
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6-40. Digital Controller Troubleshooting
6-41. IN-GUARD MICROCOMPUTER SYSTEM
Page
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6-48. DISPLAY SYSTEM
Page
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6-59. ANALOG CONTROL SIGNALS
Page
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6-62. DC Scaling Troubleshooting
Page
6-63. Track/Hold Troubleshooting
6-64. Ohms Current Source Troubleshooting
Page
6-65. Precision Voltage Reference Troubleshooting
6-66. A/D Converter Troubleshooting
Page
6-67. Power Supply Troubleshooting
Page
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6-68. IEEE-488 Interface Troubleshooting (Option -05) 6-69. SERVICE POSITION
6-70. DIAGNOSTIC PROGRAM
TROUBLESHOOTING
6-65
6-71. True RMS AC Troubleshooting (Option -09) 6-72. SERVICE POSITION
6-73. MAJOR PROBLEMS
Page
6-74. MORE OBSCURE PROBLEMS
6-75. Guard Crossing Troubleshooting
6-76. INTERNAL CLEANING
6-77. Cleaning Printed Circuit Assemblies
6-78. Cleaning After Soldering
Page
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7-1. INTRODUCTION
7-2. HOW TO OBTAIN PARTS
7-3. MANUAL STATUS INFORMATION
7-4. NEWER INSTRUMENTS
7-5. SERVICE CENTERS
List of Replaceable Parts SERVICE CENTERS
7-5
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7-10
Table 7-2. A1 Main PCA
List of Replaceable Parts SERVICE CENTERS
7-11
Table 7-2. A1 Main PCA (cont)
7-12
Table 7-2. A1 Main PCA (cont)
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Chapter 8
Options and Accessories
Page
Options and Accessories INTRODUCTION
8-3
8-1. INTRODUCTION
8-2. ACCESSORIES
8-3. Rack-Mount Kits (Y8834, Y8835 and Y8836)
8-4. Shielded IEEE-488 Interface Cables (Y8021, Y8022, and Y8023)
8-5. Replacement Test Leads (TL70A)
8-6. Deluxe Test Lead Kits (Y8134)
8-10. Current Shunt (80J-10)
8-11. Current Probes (Y8100, Y8101, 80i-400 and 80i-600)
8-12. High Voltage Probes (80K-6 and 80K-40)
Page
Chapter 805
Option 05 IEEE-488 Interface
Page
805-1. INTRODUCTION
805-2. CAPABILITIES
805-3. EXTERNAL CONTROLS
805-4. INSTALLATION
805-5. PROGRAMMING INSTRUCTIONS
805-6. MAINTENANCE
805-7. LIST OF REPLACEABLE PARTS
Page
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809-1. INTRODUCTION
809-2. INSTALLATION