Fluke 8842a - page 15

1-1

Chapter 1

Introduction and Specifications

Title Page

1-1. INTRODUCTION................................................................................1-2

1-2. THE 8842A DIGITAL MULTIMETER.............................................. 1-2

1-3. OPTIONS AND ACCESSORIES........................................................1-2

1-4. SPECIFICATIONS.............................................................................. 1-3

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 Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 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 Page Page Page 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 Page Page 6-34. INTERNAL FUSE REPLACEMENT 6-35. EXTERNAL TRIGGER POLARITY SELECTION (Option - 05 Only) 6-36. TROUBLESHOOTING 6-37. Initial Troubleshooting Procedure Page Page Page Page 6-38. Diagnostic Self-Tests 6-39. Self-Test Descriptions Page Page 6-40. Digital Controller Troubleshooting 6-41. IN-GUARD MICROCOMPUTER SYSTEM Page Page 6-48. DISPLAY SYSTEM Page Page 6-59. ANALOG CONTROL SIGNALS Page Page 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 Page 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 Page Page 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 Page Page Page Page 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) Page Page Page Page Page Page Page Page 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 Page Page Page Page Page 809-1. INTRODUCTION 809-2. INSTALLATION