Fluke 893AR Digital Multimeter
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Modell:
893AR
Datum:
1969
Kategorie:
Gruppe:
Beschreibung:
AC-DC Differential Voltmeter
Information
The Fluke Model 893A and AR AC-DC Differential Voltmeters
provide conventional or differential measurements of ac
voltages from one millivolt to 1100 volts ac and dc voltages
from 10 microvolts to 1100 volts dc. Conventional (TVM)
measurements are made with an accuracy of ±3% of the
selected range to initially determine the magnitude of the
measured voltage. The differential (NULL) mode is then used
with an improved accuracy of up to 250% over that of the
conventional mode to determine the exact value of the
measured voltage. One linear meter-scale greatly simplifies
all measurements made with the instrument. Whenever the
instrument is operated on the differential mode, an inline
digital readout representing the magnitude of the measured
voltage is available from the front panel Read-out dials.
Two versions of the instrument are available and are
identified as the Model 893A or Model 893AR, The Model 893A
is a portable unit, half-rack in width, with a tilt-down
carrying handle. This handle detents into the instrument’s
feet to serve as a tilt-bale during bench-top use of the
instrument. The Model 893AR is also a portable unit, but is
of proper width for installation in a standard electronic
equipment rack. Carrying of this instrument is provided by
two front panel handles. A tilt-down bale located on the
bottom of the instrument facilitates bench-top use of the
instrument,
A rechargeable battery and recorder output options are also
available for either version of the instrument. These
options can be installed at the factory, upon request, or in
the field. Option Kit 893A-7Ü01 comprises the rechargeable
battery pack and, when installed in the instrument, is
identified as the -01 option on the rear panel decal. Option
Kit 893A-7002 comprises the recorder output and, when
installed in the instrument, is identified as the -02 option
on the rear panel decal.
Dokumenttyp:
Service- und Bedienungsanleitung
Seiten:
104
Größe:
6.81 Mbytes (7143446 Bytes)
Sprache:
english
Revision:
5
Dokument-ID:
294272
Datum:
1975 05 01
Qualität:
Gescanntes Dokument, alles ist lesbar.
Upload Datum:
2018 01 16
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Information
I INTRODUCTION AND SPECIFICATIONS 1-1
1-1.
Introduction ... 1-1
1-5. Electrical Specifications ... 1-1
1-6. Differential Voltmeter ... 1-1
1-7. Conventional Voltmeter (TVM) ... 1-2
1-8. General Specifications ... 1-2
1-9, Environmental Specifications ... 1-2
1-10. Mechanical Specifications. . ... 1-3
H OPERATING INSTRUCTIONS 2-1
2-1.
Introduction ... 2-1
2-4. Operating Features ... 2-1
2-6. Operation from 115/230 volt AC Power Lines ... 2-1
2-9. Preliminary Operating Procedures ... . 2-1
2-11. Operational Test ... 2-1
2-15, Operating Notes ... 2-4
2-16. Ground Loop Currents ... 2-4
2-18. Common Mode Voltages ... 2-4
2-20. Use of Shorting Link ... 2-4
2-22. DC Differential Off-Null Input. Resistance . . . 2-4
2-24. TVM Mode Operation ... 2-5
2-26, Differential Mode Operation ... 2-5
2-28. Optional Recorder Output Operation . ... 2-6
2-30. Applications ...
2-31. Introduction ... 2-6
2-33, Measurement of Voltage Excursions About
a Nominal Value ... . 2-6
2-35. Measurement of Extremely High Resistances . 2-6
2-37. Operation as a Null Detector ... 2-7
2-39. Measurement of DBM ... 2-7
m THEORY OF OPERATION 3-1
3-1. Introduction ... 3-1
3-3. Block Diagram Analysis ... 3-1
3-4. Introduction ... 3-1
3-6. Conventional TVM Mode ... 3-1
3-9. Differential Null Mode ... 3-1
3-12. Optional Recorder Output ... 3-2
3-14. Circuit Analysis ... 3-2
3-15. Introduction ... 3-2
3-17. Power Supply/Battery Charger ... 3-2
3-20. The Reference Supply ... 3-3
3-28. Kelvin-Varley Divider ... 3-4
3-33. AC Converter ... 3-5
3-38. Null Detector ... 3-6
3-43. DC Input Divider ... 3-7
3-46. Optional Recorder Output ... 3-7
IV MAINTENANCE 4-1
4-1. introduction ... 4-1
4-5. Service
Information ... 4-.1
4-8. Disassembly Instructions ... 4-2
4-9. The Model 893A Disassembly Instructions . . 4-2
4-11. The Model 893AR Disassembly Instructions . , 4-3
4-13. General Maintenance ... 4-3
4-14. Periodic Cleaning ... 4-3
4-17. Fuse Replacement. . ... 4-3
4-19. Battery Replacement ... 4-3
4-21. Precalibration and Troubleshooting . ... 4-7
4-22. Introduction ... 4-7
4-25. Reference Amplifier/Reference Inverter
Checks ... 4-7
4-28. Null Detector/Divider Checks ... 4-9
4-31. Kelvin-Varley Divider Checks ... 4-10
4-34. Recorder Output Option Checks. ... 4-10
4-37. AC Converter Checks . ... 4-1.1
4-40. Calibration Procedures ... 4-12
4-41. Introduction ... 4-12
4-45. Meter Mechanical Zero Adjust . ... 4-12
4-47. Zener Reference Supply Calibration ... 4-14
4-49. Null Detector Calibration ... 4-14
4-51. Kelvin-Varley Divider Calibration . ... 4-15
4-53. DC Voltage Range Calibration ... 4-15
4-55. AC Converter Calibration ... . 4-16
V LIST OF REPLACEABLE PARTS 5-1
5-1. Introduction ... 5-1
5-4. Column Description ... 5-1
5-5. How to Obtain Parts ... ... 5-2
5-8. List of
Abbreviations ... 5-2
5-9. Serial Number
Effectivity ... 5-37
APPENDIX A
JOHN Fluke MFG. CO. WARRANTY
LIST OF SALES REPRESENTATIVES
LIST OF FACTORY AUTHORIZED SERVICE CENTERS
SCHEMATIC DIAGRAM