Equipment information:

Fluke 720A Other
Manufacturer:
Fluke
Model: 720A
Date: 1969
Category: Measurement instruments
Group: Other
Description: Kelvin-Varley Voltage Divider
Information:
                                    1-1. INTRODUCTION
1-2. The Model 720A Kelvin-Varley Voltage Divider is a
seven-dial primary ratio standard which meets the most
exacting requirements of the standards laboratory. Absolute
linearity of 0.1 ppm, temperature coefficient of linearity
of 0.1 ppm/°C, and self-calibration make the 720A the most
accurate instrument available for the comparison of primary
and secondary voltage and resistance standards. The
linearity has a small power derating coefficient of 0. 2 ppm
per watt which is a- chieved by matching the resistors1
temperature coefficients close to zero. This permits
operation at up to 1100 volts and 11 watts.
1-3. The Model 720A has two high input terminals. The
terminal labeled INPUT 1. 0 is for general use in all
Kelvin-Varley applications for which direct reading, in
ratio, is desired. The terminal labeled INPUT 1.1 is used
for voltage measurement applications when both direct
reading in voltage and over-ranging are desired. An example
of this application is the measurement of standard cell
voltages. Use of the 1.1 INPUT at a level of 1.1 volts in
this application results in divider resolution of 0.1
microvolt and allows comparison of standard cells to within
1 microvolt.
1-4. Only thoroughly aged resistors of the highest quality
are used in the Model 720A Kelvin-Varley Divider. As a
result, linearity change per year will not exceed one part
per million unless the instrument is subjected to abuse. To
assure that the divider remains within its specifications
throughout its useful life, adjustments are provided for the
resistors of the first three decades. The third decade
adjustments normally will be used only during annual
calibration. Performing the self calibration procedure sets
the adjustments of the first two decades. With reasonable
care these adjustments will provide instrument accuracy of
0.1 part per million at the time of adjustment.

These manuals are available for the above equipment:

Fluke -- 720A -- Service and User Manual
File name: Fluke-7932-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 82
Size: 46.96 Mbytes (49241365 Bytes)
Language: english
Revision: 2
Manual-ID/Number: P/N 294058
Date: September 1974
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: d8a9e663b39c03b29cb0fe49908baadb
ed2kID: f0b43c4d8f3e75fa6ab476cdf6b28cd0
Downloads: 24 since 12 June 2016
Information:
1 INTRODUCTION AND SPECIFICATIONS .
......................................... . 1-1
1-1. Introduction . .............................. .
............................... 1-1
1-5. Electrical Specifications..................... .... . 1-1
1-6. Mechanical and Environmental
Specifications............................... 1-2
2 OPERATING
INSTRUCTIONS.............................................................................
2-1
2-1. Introduction
..................................................................................
2-1
2-3. Power
Limitations.............................................................................
2-1
2-5. Functions of Controls and
Terminals............................................... 2-1
2-7. Ratio Errors Caused by Loading or
Leakage..................................... 2-1
2-18. Temperature
Control........................................................................
2-3
2-20. Power
Coefficient.............................................................................
24
2-22. End
Errors............................................................................................
2-4
2-24. Self-Calibration
Procedure..............................................................
2-4
2-26. Check Positions of the Function
Switch.......................................... 2-"
2-28. Applications of the Model
720A........................................................ 2-7
3 THEORY OF
OPERATION.................................................................................
3-1
3-1.
Introduction.......................................................................................
3-1
3-3. The Basic
Circuit...................................................................................
3-1
3-6. Circuit
Refinements..............................................................................
3-1
3-8. The Model
720A...................................................................................
3-1
4
MAINTENANCE..............................................................................................................4-1
4-1.
Introduction..................................................................................................4-1
4-4. Test Equipment Required for
Maintenance................................................4-1
4-6. Preventive
Maintenance...................................................................................4-1
4-19.
Calibration.......................................................................................................4-13
4-28.
Troubleshooting.............................................................................................4-18
4-38.
Repair.............................................................................................................4-19
4-41. Service
Information........................................................................................4-19
5 LIST OF REPLACEABLE
PARTS...................................................................................5-1
5-1.
Introduction..................................................................................................5-1
5-3. Columnar
Information...................................................................................5-1
5-4. How to Obtain
Parts........................................................................................5-2
5-8. Serial Number
Effectivity..............................................................................5-2
6 OPTIONS/NOT APPLICABLE
7 GENERAL
INFORMATION..............................................................................................7-1
8 SCHEMATIC
DIAGRAMS..............................................................................................8-1
Fluke-7932-Manual-Page-1-Picture
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