Equipment information
Fluke 8922A Digital multimeter
Manufacturer:
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Model:
8922A
Date:
1979
Category:
Group:
Description:
True RMS Voltmeter
Information
The Model 8922A is a Digital True RMS Voltmeter, capable of
accurately measuring the true rms value of nonsinusoidal
signals containing AC or AC + DC components. The instrument
has a frequency range of 10 Hz to 11 MHz with a full-scale
crest factor of seven, and is capable of displaying
measurements in either volts or dB units.
Selecting the VOLTS position on the dB/VOLTs switch enables
the volts display mode and two applicable front panel
annunciators (V, mV). In this mode, the instrument displays
up to a 3lA digit figure to indicate the true rms value of
any AC or AC + DC input signal whose amplitude is between
180µV and 700V rms (1000V peak).
The dB display mode (logarithmic) is enabled when dB is
selected on the front panel dB/VOLTS display switch. In this
mode, the instrument displays up to a 4l/i digit dBm value
of the input signal referenced to one-of-twelve manually
selected impedances (50 to 1200 ohms). The dB display mode
also uses two annunciators — dB and RELATIVE REFERENCE — and
to establish the instrument’s operating status. The RELATIVE
REFERENCE annunciator lights whenever the REL switch is
depressed to indicate that any further dB measurements will
be referenced to the voltage present at the time the switch
was pressed. An UNCAL annunciator lights with both display
modes when internal protection circuits are energized. When
AUTO is selected on the AUTO/HOLD switch (the out position)
the autorange mode selects one-of-seven input ranges to
optimize the display resolution.
Complementing the instrument’s high digital resolution is an
analog panel meter for use in applications that require
peaking or nulling. This meter does not have
calibration markings since it is intended for peaking and
nulling indications only.
Note that the 8922A accomodates floating measurements up to
approximately 0.6V peak with respect to earth ground.
Isolation of 0.6V peak will accomodate the few hundred
millivolts of typical common mode voltage. Full operator
protection is maintained since — under fault conditions —
the diode isolation circuitry conducts to insure that the
common mode voltage is never greater than one diode drop.
Manual Type:
Service and User Manual
Pages:
124
Size:
9.52 Mbytes (9979437 Bytes)
Language:
english
Revision:
Manual-ID:
522052
Date:
1979 06 01
Quality:
Scanned document, all readable.
Upload date:
2018 01 16
MD5:
e2357d51b2a14894c143c83df9bd6edd
Downloads:
655
Information
1 INTRODUCTION AND SPECIFICATIONS 1-1
l-l.
INTRODUCTION ... 1-1
1-9.
SPECIFICATIONS ... 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
... 2-1
2-10. CONTROLS AND INDICATORS
... 2-1
2-12. OPERATING NOTES
... 2-4
2-14. Fuse Replacement
... 2-4
2-16. Display Indications
... 2-4
2-21. Measurement Connections
... 2-4
2-36. Input Signal
Considerations ... 2-5
2-43. Range Selection
... 2-6
2-50. Voltage Display Mode
... 2-6
2-53. dB Display
Mode ... 2-7
2-56. dBm Measurements
... 2-7
2-61. Relative Measurements (REL)
... 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
... 3-3
3-13. DETAILED BLOCK DIAGRAM DESCRIPTION
... 3-3
3-15. Signal
Conditioner ... 3-3
3-17. RMS Converter
... 3-4
3-20. A/D
Converter ... 3-5
3-24. Controller
... 3-5
3-41. Display and Annunciators
... 3-10
3-44. Power Supply
... 3-10
4 MAINTENANCE 4-1
4-1.
INTRODUCTION ... 4-1
4-3. SERVICE INFORMATION
... 4-1
4-6. GENERAL MAINTENANCE
... 4-1
4-7. Access Information
... 4-1
4-9. INPUT POWER
SELECTION ... 4-1
4-11.
Cleaning ... 4-3
4-13. Fuse Replacement
... 4-3
4-15. PERFORMANCE
CHECK ... 4-3
4-18. Low and Midband Performance Check (Volts Display Mode
... 4-3
4-20. dB Display Mode
Check ... 4-5
4-22. DC Low Level Check
... 4-5
4-24. AC Low Level Check
... 4-5
4-26. High Frequency Response Check
... 4-5
4-28. CALIBRATION
ADJUSTMENTS ... 4-7
4-32. Power Supply Calibration
Adjustment ... 4-10
4-34. Low and Midband Accuracy Adjustment
... 4-10
4-36. Linear Analog
Output ... 4-11
4-38. AC Low Level Calibration and Filter
Check ... 4-12
4-40. High Frequency
Calibration ... 4-13
4-42. RMS Protection Circuit Calibration
... 4-14
4-44. TROUBLESHOOTING
... 4-14
4-48. RMS Sensor Replacement
... 4-18
4-50. A/D Calibration Resistor Selection
... 4-19
4-52. DC Offset Resistor Selection
... 4-19
5 LISTS OF REPLACEABLE PARTS 5-1
TABLE OF CONTENTS ... 5-1
5-1.
INTRODUCTION ... 5-2
5-4. HOW TO OBTAIN PARTS
... 5-2
6 OPTION AND ACCESSORY INFORMATION 6-1
TABLE OF CONTENTS ... 6-1
7 GENERAL INFORMATION 7-1 7A MANUAL CHANGE INFORMATION 7A-1
8 SCHEMATIC DIAGRAMS 8-1
TABLE OF CONTENTS ... 8-1