Fluke 8921A Digital multimeter
Manufacturer:
Model:
8921A
Date:
1978
Category:
Group:
Description:
True RMS Voltmeter
Information
The Models 8920A and 8921A are digital true rms voltmeters, capable of accurately measuring the true rms value of nonsinusoidal signals containing AC or AC + DC components. Both have a frequency range of 10 Hz to 20 MHz with a full-scale crest factor of seven, and are capable of displaying measurements in either volts or dB units.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
129
Size:
9.42 Mbytes (9881820 Bytes)
Language:
english
Revision:
Manual ID:
P/N 487157
Date:
01 July 1988
Quality:
Scanned document, all readable.
Upload date:
10 August 2017
MD5:
10c1e16add724b1f56512860dbd9ad5c
Downloads:
529
Information
.............................. 1-1 1-1. INTRODUCTION ............................................. 1-1 1-9. SPECIFICATIONS .............................................. 1-2 1-11. Specifications, Options ........................................ 1-2 2 OPERATING INSTRUCTIONS ......................................... 2-1 2-1. INTRODUCTION ............................................. 2-1 2-3. SHIPPING INFORMATION ................................... 2-1 2-6. INSTALLATION .............................................. 2-1 2-8. INPUT POWER ............................................... 2-2 2-10. CONTROLS AND INDICATORS ............................... 2-2 2-12. OPERATING NOTES.......................................... 2-4 2-14. Fuse Replacement ............................................ 2-4 2-16. Display Indications ........................................... 2-4 2-21. Measurement Connections..................................... 2-4 2-37. Input Signal Considerations ................................... 2-6 2-43. Range Selection .............................................. 2-6 2-50. Voltage Display Mode ........................................ 2-6 2-53. dB Display Mode ............................................ 2-6 2-56. dBm Measurements .......................................... 2-7 2-68. Linear Analog Output ........................................ 2-8 2-70. OPERATION ................................................. 2-8 3 THEORY OF OPERATION ............................................ 3-1 3-1. INTRODUCTION ............................................. 3-1 3-3. OVERALL FUNCTIONAL DESCRIPTION ...................... 3-1 3-5. Analog Circuitry ............................................. 3-1 3-10. Digital Circuitry ............................................. 3-2 3-13. DETAILED BLOCK DIAGRAM DESCRIPTION ................ 3-2 3-15. Signal Conditioner ........................................... 3-2 3-17. RMS Converter.............................................. 3-2 3-20. A/D Converter .............................................. 3-2 3-24. Controller ................................................... 3-5 3-42. Display and Annunciators ..................................... 3-10 3-45. Power supply ............................................... 3-11 4 MAINTENANCE ...................................................... 4-1 4-1. INTRODUCTION ..........................................................................................4-1 4-4. GENERAL MAINTENANCE ......................................................................4-1 4-5. Access Information ......................................................................................4-1 4-7. INPUT POWER SELECTION ....................................................................4-1 4-9. Cleaning ........................................................................................................4-1 4-11. Fuse Replacement ........................................................................................4-3 4-13. PERFORMANCE CHECK ..........................................................................4-3 4-15. Low and Midband Performance Check (Volts Display Mode) ............4-3 4-17. dB Display Mode Check ............................................................................4-3 4-19. DC Low Level Check ..................................................................................4-5 4-21. AC Low Level Check ..................................................................................4-5 4-23. High Frequency Response Check ..............................................................4-5 4-25. CALIBRATION ..............................................................................................4-5 4-28. Power supply Calibration ..........................................................................4-5 4-30. Low and Midband Accuracy Adjustments ..............................................4-10 4-32. Linear Analog Output /8920A only) ........................................................4-10 4-34. AC Low Level Calibration ........................................................................4-10 4-36. High Frequency Calibration ......................................................................4-13 4-38. RMS Protection Circuit Calibration ........................................................4-13 4-40. TROUBLESHOOTING..................................................................................4-14 4-44. RMS Sensor Replacement..........................................................................4-15 4-46. A/D Calibration Resistor Selection ..........................................................4-19 4-48. DC Offset Resistor Selection ...................................4-19 5 LIST OF REPLACEABLE PARTS ...................................... 5-1 5-1. INTRODUCTION ............................................. 5-2 5-4. HOW TO OBTAIN PARTS..................................... 5-2 6 OPTION AND ACCESSORY INFORMATION ........................... 6-1 7 GENERAL INFORMATION ............................................ 7-1 7A-1 MANUAL CHANGE INFORMATION ................................... 7A-1 8 SCHEMATIC DIAGRAMS ............................................. 8-1

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Service Manual Supplement
Manual type:
Service Manual Supplement
Pages:
5
Size:
45.04 Kbytes (46117 Bytes)
Language:
english
Revision:
8
Manual ID:
Date:
01 June 1999
Quality:
Electronic document, no scan, very well readable.
Upload date:
14 January 2018
MD5:
ff6b80a0b080e0bb159ae51074248787
Downloads:
307
Information
Manual Supplement

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