Fluke 792A Other
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Model:
792A
Date:
1992
Category:
Group:
Description:
AC/DC Transfer Standard
Information
The 792A AC/DC Transfer Standard is a laboratory standard
instrument that calibrates ac voltage calibrators, ac/dc
transfer standards, and ac voltmeters. It consists of four
main components: a transfer standard sensor unit (called the
transfer standard in this manual), power pack, 1000V range
resistor, and transfer switch.
Inputs are accepted in the range 2 mV to 1000V rms, 10 Hz up
to 1 MHz, with a maximum Volt-Hertz product of 10 The 792A
compares the heating effect of an ac voltage with that of a
known dc voltage (or other ac voltage). Sensing the rms
value is done entirely without thermocouples and the
drawbacks that accompany them. (See The Fluke RMS Sensor,
paragraph 1-3, for more information.)
The transfer standard accepts dc and ac voltages through a
stainless steel Type “N” INPUT connector and presents a dc
voltage at the front panel DC OUTPUT binding posts that is
linearly proportional to the rms potential of the input. A
digital voltmeter of 6V4-digit resolution or better can be
used to resolve the 2.0V nominal full-scale output.
An OVERLOAD indicator and beeper warns of input overloads.
Even though the transfer standard is protected
electronically from overloads, it is a delicate laboratory
instrument and should be treated with extreme care.
Before operating the transfer standard, be sure to read
Sections 2 and 3, particularly the WARNING that explains the
restriction to use only sources that are current-limited to
200 mA or less (at the beginning of Section 2), and the
CAUTION about observing the voltage protection level limits
for each INPUT RANGE setting.
Manual type:
Service and User Manual
Pages:
192
Size:
14.92 Mbytes (15648385 Bytes)
Language:
english
Revision:
1
Manual ID:
871723
Date:
1992 12 01
Quality:
Scanned document, all readable.
Upload date:
2017 02 04
MD5:
b477ec8f6ddf02b1c744c01150727dca
Downloads:
939
Information
1 INTRODUCTION AND SPECIFICATIONS
... 1-1
1-1. INTRODUCTION
...
1-1
1-2. THE Fluke RMS SENSOR
...
1-1
1-3. STANDARD EQUIPMENT
...
1-2
1-4. 792A AC/DC Transfer Standard
... 1-2
1-5. 792A-7001 Power Pack
...
1-2
1-6. 792A-7002 1000V Range
Resistor ...
1-2
1-7. 792A-7003 Transfer
Switch ...
1-2
1-8. Stainless Steel Type “N” Extender
... 1-3
1-9. Power Pack Cable
...
1-3
1-10. ACCESSORY Fluke A40 CURRENT SHUNT ADAPTER
... 1-3
1-11. SERVICE AND CALIBRATION
INFORMATION ... 1-3
1-12. SPECIFICATIONS
...
1-4
2 INSTALLATION AND SAFETY
...
2-1
2-1. INTRODUCTION
...
2-1
2-2. UNPACKING AND INSPECTION
... 2-2
2-3. ENVIRONMENTAL AND INPUT REQUIREMENTS
... 2-3
2-4. SELECTING LINE VOLTAGE AND ACCESSING THE FUSE ... 2-4
2-5. CONNECTING TO LINE POWER
... 2-5
3
OPERATION ...
3-1
3-1. INTRODUCTION
...
3-1
3-2. SUMMARY OF FEATURES
...
3-1
3-3. 792A AC/DC Transfer Standard Front
Panel ... 3-1
3-4. 792A AC/DC Transfer Standard Rear
Panel ... 3-1
3-5. 792A-7001 Power Pack Front Panel
... 3-1
3-6. 792A-7001 Power Pack Rear Panel
... 3-2
3-7. 792A-7002 1000V Range
Resistor ...
3-2
3-8. 792A-7003 Transfer
Switch ...
3-2
3-9. 792A Test Report
...
3-2
3-10. USING THE POWER PACK
... 3-14
3-11. PREPARING TO MAKE A TRANSFER
... 3-15
3-12. Using the 792A Test Report
...
3-15
3-13. Using the Fluke 5700A with the Transfer Standard
... 3-16
3-14. Initial Setup and Warmup 3-16
3-15. Cable Connections for Making a
Transfer ... 3-17
3-16. Connecting and Using the Transfer Switch
... 3-17
3-18. Connecting DC Voltage Sources to the INPUT
... 3-18
3-19. Connecting AC Voltage Sources to the INPUT
... 3-18
3-20. When to Use Four-Wire Sensing 3-19
3-21. Connecting the Guard and Ground
... 3-19
3-22. MAKING A TRANSFER 3-20
3-23. Using a Deflection Method to Measure an AC Voltage
Source .. 3-21
3-24. Using a Nulling Method to Measure an AC Voltage Source
... 3-24
3-25. Determining the Error of an AC
Voltmeter ... 3-25
3-26. Calibrating Another Transfer Standard
... 3-30
3-27. TECHNIQUES FOR REDUCING TRANSFER ERRORS ... 3-30
3-28. DC Reversal 3-30
3-29. Loading 3-31
3-30. Mechanical Contact 3-31
3-31. Thermal EMFs 3-32
3-32. EMI
...
3-32
4 THEORY OF OPERATION
...
4-1
4-1. INTRODUCTION
... 4-1
4-2. OVERALL FUNCTIONAL DESCRIPTION ... 4-1
4-3. Range Resistors and Amplifiers 4-2
4-4. RMS Sensing and Sensor Protection ... 4-2
4-5. Output Filter/Buffer 4-2
4-6. Binding Posts 4-2
4-7. 792A-7001 Power Pack 4-2
4-7. DETAILED CIRCUIT DESCRIPTION ... 4-2
4-8. Fluke RMS Sensor Circuit 4-2
4-9. Passive (Non-Amplified) Ranges 4-3
4-10. 792A-7002 1000V Range Resistor 4-3
4-11. Active (Amplified) Ranges 4-3
4-12. Sensor Protection Circuit 4-4
4-13. Power Pack 4-5
4-14. Overcurrent Protection 4-5
4-15. Battery Voltage Monitor 4-5
4-16. On/Off Circuit 4-5
4-17.
Relays ... 4-5
5 MAINTENANCE
...
5-1
5-1. INTRODUCTION
...
5-1
5-2. REPLACING THE FUSE 5-1
5-3. GENERAL CLEANING 5-1
5-4. CALIBRATION 5-1
5-5. PERFORMANCE TESTING 5-6
5-6. Testing the Power Pack 5-7
5-7. Testing the Power Pack Interconnect Cable
... 5-7
5-8. Testing the Transfer Switch 5-7
5-9. Testing the Sensor Unit and 1000V Range Resistor
... 5-9
5-10. ACCESS PROCEDURES
...
5-9
5-11. Power Pack Initial Access Procedure
... 5-10
5-12. ACCESSING THE A3 Power supply
PCA ... 5-10
5-13. REPLACING THE BATTERIES
... 5-10
5-14. Sensor Unit Initial Access Procedure
... 5-12
5-15. REPLACING THE Fluke RMS SENSOR (U111)
... 5-12
5-16. ACCESSING THE Filter PCA
... 5-14
5-17. TUNING THE SENSOR UNIT
...
5-14
5-18. TROUBLESHOOTING
...
5-20
5-19. Troubleshooting the Power Pack
... 5-21
5-20. Troubleshooting the Sensor Unit
... 5-21
5-21. PROTECTION CIRCUIT
...
5-23
5-22. OUTPUT CIRCUIT
...
5-23
5-23. CLEANING PCA’S
...
5-25
5-24. LUBRICATING THE TRANSFER SWITCH
... 5-25
6 LIST OF REPLACEABLE PARTS
...
6-1
CONTENTS
...
6-1
6-1. INTRODUCTION
...
6-3
6-2. HOW TO OBTAIN PARTS
...
6-3
6-3. MANUAL STATUS INFORMATION
... 6-3
7 SCHEMATIC DIAGRAMS
...
7-1
CONTENTS
...
7-1
APPENDICES
APPENDIX A GLOSSARY
...
A-l
APPENDIX B USING THE 792A-7004 A40 CURRENT SHUNT ADAPTER B-l
APPENDIX C CALCULATING CORRECTION FACTORS FOR FC100 HZ C-l
APPENDIX D ESTABLISHING TRACEABILITY FOR A HIGH
PERFORMANCE AC/DC TRANSFER STANDARD ... D-l
APPENDIX E USING A LINEAR Thermal Transfer Standard
FOR PRECISION AV/DV
TRANSFERS ... E-l
INDEX