Fluke 8842a User Manual Page 233
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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8842A
Instruction Manual
8-4
8-2. ACCESSORIES
Accessories include a variety of rack-mounting kits, cables, test leads, and probes. The
accessories include installation and/or operating instructions.
8-3. Rack-Mount Kits (Y8834, Y8835 and Y8836)
The rack-mount kits allow the 8842A to be mounted in standard 19-inch rack panels. The
Y8834 kit allows the 8842A to be mounted either on the left or the right. The Y8835 kit
allows two 8842As to be mounted side-by-side. The Y8836 kit allows the 8842A to be
mounted in the center of the rack. Installation instructions are given in Section 2, and are
also included with each kit.
8-4. Shielded IEEE-488 Interface Cables (Y8021, Y8022, and Y8023)
Shielded IEEE-488 cables are available in three lengths (see Table 8-1). The cables attach
the 8842A to any other IEEE-488 device. Each cable has double 24-pin connectors at
both ends to allow stacking. Metric threaded mounting screws are provided with each
connector.
8-5. Replacement Test Leads (TL70A)
The TL70A replacement test leads feature safety-designed input connectors.
8-6. Deluxe Test Lead Kits (Y8134)
Each deluxe test lead kit includes two test-tip probes, two alligator clips, two large spade
lug tips, and one spring-loaded hook tip and probe.
8-7. Slim-Flex Test Leads (Y8140)
The Y8140 has adjustable, flexible, and insulated leads, and can fit into small places. The
sharp steel needle points will pierce varnish and thin insulation.
8-8. Temperature Probes (80T-150U, and 80TK.)
The 80T-150U is a universal temperature probe designed to provide virtually any DMM
with temperature measurement capability. The probe provides direct temperature
conversion of 1 mV dc per degree. A three-position switch acts as a power switch and is
used for selecting Celsius or Fahrenheit scaling for the output. The 80TK thermocouple
module converts the microvolt output from a "K" type thermocouple to a 1 mV per
degree signal. The on-off switch allows selection of degrees "C" or "F" output scaling.
8-9. RF Probes (85RF and 83RF)
The RF probes (85RF and 83RF) use the DMM dc volts function to measure radio
frequency (RF) ac signals. The 83RF has a frequency range of 100 kHz to 100 MHz; the
85RF has a frequency range of 100 kHz to 500 MHz. The probes are calibrated so that
the dc output is equivalent to the rms value of a sine wave input over a range of 0.25V to
30V rms.
For best accuracy, the probes should be used with DMMs having 10 MΩ input
impedance. This condition is satisfied by the 8842A in the 200V and 1000V ranges. The
probes can also be used with the 8842A in the 200 mV, 2V, and 20V ranges if a 10 MΩ
resistor is connected in parallel across the 8842A input terminals.
- Instruction Manual 1
- Table of Contents 3
- List of Tables 9
- List of Figures 11
- Contents 13
- Chapter 1 15
- 1-1. INTRODUCTION 16
- 1-3. OPTIONS AND ACCESSORIES 16
- 1-4. SPECIFICATIONS 17
- SPECIFICATIONS 19
- Operating Instructions 26
- 2-1. INTRODUCTION 27
- 2-2. INSTALLATION 27
- 2-5. Adjusting the Handle 28
- 2-6. Rack Mounting Kits 28
- 2-7. OPERATING FEATURES 29
- OPERATING FEATURES 30
- Function 31
- 2-10. Display Features 33
- 2-11. Error Messages 33
- 2-12. Overrange Indication 35
- 2-13. Diagnostic Self-Tests 35
- 2-14. Ranging 35
- 2-15. AUTORANGE 35
- 2-16. MANUAL RANGE 36
- 2-17. Triggering 36
- 2-19. EXTERNAL TRIGGER MODE 36
- 2-24. MAKING MEASUREMENTS 38
- 2-29. Offset Measurements 39
- 2-30. EXTERNAL CLEANING 40
- Remote Programming 42
- 3-1. INTRODUCTION 44
- 3-2. CAPABILITIES 44
- 3-3. BUS SET-UP PROCEDURE 44
- 3-5. A NOTE ABOUT EXAMPLES 47
- B1 Offset On 48
- PUT COMMAND FORMAT 49
- N <value> P0 49
- 3-7. Bn (Offset Commands) 50
- 3-9. Dn (Display Commands) 50
- 3-10. Fn (Function Commands) 51
- 3-11. Get Commands 51
- gain calibration 52
- 3-13. G1 (Get SRQ Mask) 53
- DEVICE-DEPENDENT COMMAND SET 54
- 3-17. G5 (Get IAB Status) 55
- 3-18. G6 (Get YW Status) 55
- 3-19. G7 (Get Error Status) 55
- 3-22. Put Commands 56
- 3-24. P1 (Put SRQ Mask) 57
- 3-27. Rn (Range Commands) 58
- 3-32. Yn (Suffix Commands) 60
- 3-33. Z0 (Self-Test Command) 60
- 3-36. INPUT SYNTAX 61
- 3-37. Definitions 62
- 3-38. Input Processing 62
- 200 PRINT @3, "F4" 64
- 300 INPUT @3, A 64
- 200 INPUT @3, A 65
- 300 PRINT @3, "F4" 65
- 200 INPUT @3, A 65
- 3-42. Types of Output Data 66
- 3-44. MEASUREMENT DATA 66
- 3-45. OVERRANGE INDICATION 67
- 3-46. ERROR MESSAGES 67
- 3-47. Status Data 67
- 3-48. Output Priority 67
- 3-49. SERVICE REQUESTS 68
- 3-51. The SRQ Mask 69
- 3-52. INTERFACE MESSAGES 70
- 3-56. TALK-ONLY MODE 71
- 3-57. REMOTE CALIBRATION 72
- 3-58. TIMING CONSIDERATIONS 72
- 3-59. IMMEDIATE MODE COMMANDS 72
- 3-60. EXAMPLE PROGRAMS 73
- EXAMPLE PROGRAMS 74
- (interface clear) 91
- 4-1. INTRODUCTION 93
- 4-2. DC VOLTAGE MEASUREMENT 93
- DC VOLTAGE MEASUREMENT 94
- 4-5. RESISTANCE MEASUREMENT 95
- 4-8. 4-Wire Ohms 96
- 4-10. TESTING DIODES 98
- 4-13. DC CURRENT MEASUREMENT 99
- Measurement Tutorial 100
- REDUCING THERMAL VOLTAGES 100
- 4-16. True RMS Measurement 101
- 4-17. Waveform Comparison 101
- 4-18. Crest Factor 103
- 4-21. Bandwidth 104
- 4-22. Zero-Input VAC Error 104
- MEASUREMENTS 106
- Theory of Operation 108
- 5-1. INTRODUCTION 110
- 5-4. DC SCALING 111
- DC SCALING 112
- 5-5. VDC Scaling 113
- 5-6. VDC Protection 114
- 5-7. mA DC Scaling 114
- 5-8. Analog Filter 114
- 5-9. TRACK/HOLD CIRCUIT 115
- TRACK/HOLD CIRCUIT 116
- 5-10. Track Configuration 117
- 5-11. Settling Configuration 118
- 5-12. Hold Configuration 118
- 5-15. OHMS CURRENT SOURCE 119
- 5-16. OHMS PROTECTION 120
- 5-17. OHMS FUNCTIONS 120
- 5-20. A/D CONVERTER 122
- 5-21. Timing/Data Control 124
- 5-22. Precision DAC 124
- 5-25. DISPLAY 125
- 5-26. KEYBOARD 126
- 5-27. DIGITAL CONTROLLER 126
- 5-28. In-Guard Microcomputer 128
- 5-31. Calibration Correction 130
- 5-35. GUARD CROSSING 131
- 5-36. POWER SUPPLY 132
- 5-38. Out-Guard Microcomputer 133
- 5-39. Guard Crossing 133
- 5-41. Signal Conditioning 134
- 5-44. VAC Scaling 134
- 5-45. mA AC Scaling 135
- A Message From 136
- PORTIONS REPRINTED 137
- Maintenance 138
- 6-1. INTRODUCTION 140
- 6-2. PERFORMANCE TEST 141
- local control 142
- PERFORMANCE TEST 144
- 6-6. Resistance Test 145
- 2 = 4 ½ digit counts 146
- 6-9. CALIBRATION 147
- 6-11. INITIAL PROCEDURE 148
- • Autoranging 149
- CALIBRATION 150
- 6-18. VERIFYING CALIBRATION 154
- 6-20. TOLERANCE CHECK 155
- 6-23. Remote Calibration 157
- 6-24. TIMING CONSIDERATIONS 160
- 6-25. REMOTE ERASURE 161
- 6-27. DISASSEMBLY PROCEDURE 162
- 6-28. Case Removal 163
- DISASSEMBLY PROCEDURE 164
- 6-31. Main PCA Removal 167
- 6-33. REASSEMBLY PROCEDURE 169
- REASSEMBLY PROCEDURE 170
- 05 Only) 173
- 6-36. TROUBLESHOOTING 173
- TROUBLESHOOTING 174
- 6-38. Diagnostic Self-Tests 178
- 6-39. Self-Test Descriptions 179
- 6-48. DISPLAY SYSTEM 185
- 6-59. ANALOG CONTROL SIGNALS 188
- 00000 11111 000000 000000 0 1 191
- 6-69. SERVICE POSITION 201
- 6-70. DIAGNOSTIC PROGRAM 201
- 6-72. SERVICE POSITION 203
- 6-73. MAJOR PROBLEMS 204
- 6-74. MORE OBSCURE PROBLEMS 206
- 6-76. INTERNAL CLEANING 207
- INTERNAL CLEANING 208
- List of Replaceable Parts 210
- 7-1. INTRODUCTION 212
- 7-2. HOW TO OBTAIN PARTS 212
- 7-4. NEWER INSTRUMENTS 213
- 7-5. SERVICE CENTERS 213
- SERVICE CENTERS 214
- Options and Accessories 230
- 8-1. INTRODUCTION 232
- 8-2. ACCESSORIES 233
- 8-10. Current Shunt (80J-10) 234
- Option –05 IEEE-488 Interface 236
- 805-3. EXTERNAL CONTROLS 238
- 805-4. INSTALLATION 238
- 805-1. INTRODUCTION 238
- 805-2. CAPABILITIES 238
- 805-6. MAINTENANCE 239
- LIST OF REPLACEABLE PARTS 240
- Option –09 True RMS AC 244
- 809-1. INTRODUCTION 246
- 809-2. INSTALLATION 246
- 809-3. OPERATING INSTRUCTIONS 247
- 809-4. MAINTENANCE 247
- Schematic Diagrams 252
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