Fluke 8842a Bedienungsanleitung Seite 194
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Maintenance
TROUBLESHOOTING
6
6-57
f6-13.wmf
Figure 6-13. Typical Output Waveforms for Track/Hold Circuit (TP103)
To test whether the Ohms Current Source is actually being sourced out the HI and LO
OUTPUT terminals, select the 20 kΩ range and the 2-wire ohms function, connect a 10
kΩ resistor across the HI and LO INPUT terminals, and measure the voltage across this
resistor with another voltmeter. There should be a 1V drop across the resistor.
- 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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