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*TB 9-6625-1866-50
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
DIFFERENTIAL VOLTMETERS
AN/USM-98, AN/USM-98A, AND AN/USM-98B
(JOHN FLUKE MODELS 801, 801R,
801B, 801BR, 801B/AG)
Headquarters, Department of the Army, Washington, DC
19 September 1970
REPORTING OF ERRORS
You can help improve this publication by calling attention to errors and by
recommending improvements and stating your reasons for the recommendations.
Your letter or DA Form 2028, Recommended Changes to Publications, should be
mailed directly to Commander, U.S. Army Aviation and Missile Command,
ATTN: AMSAM-TMD-EP, Redstone Arsenal, AL 35898-5000. FAX to DSN 788-
2313 (commercial 256-842-2313). A reply will be furnished directly to you.
Paragraph Page
SECTION I. GENERAL
Purpose and scope............................................... 1 2
Reporting of equipment publication
improvements ................................................. 2 2
Descriptive data ................................................. 3 2
General Instructions........................................... 4 3
Differences among models .................................. 5 4
II. CALIBRATION OF DIFFERENTIAL
VOLTMETERS AND/USM-98 (J-F 801 and
801R)
Equipment and accessory required..................... 6 4
Preliminary procedure........................................ 7 4
Dc VTVM and null range.................................... 8 5
500-volt range and stability................................ 9 7
50-volt range ................................................. 10 9
5-volt range ................................................. 11 9
0.5-volt range ................................................. 12 20
__________
*This bulletin supersedes TB 9-6625-994-50, 28 July 1969 and TB ORD 1026/981, 12 October 1964 including all changes.
TB 9-6625-1866-50
Paragraph Page
Voltage dividers ................................................. 13 10
Final procedure ................................................. 14 12
III. CALIBRATION OF DIFFERENTIAL
VOLTMETERS AN/USM-98A AND
AN/USM-98B (J-F 801B, J-F 801 BR, AND
J-F 801B(AG)
Equipment and accessories required .................. 15 12
Preliminary procedure........................................ 16 12
Dc VTVM and null range.................................... 17 13
500-volt range and stability................................ 18 16
50-volt range ................................................. 19 16
5-volt range ................................................. 20 17
0.5-volt range ................................................. 21 18
Voltage dividers ................................................. 22 19
Final procedure ................................................. 23 20
SPECIFIC ITEM IDENTIFICATION
Identification ................................................. 24 20
Secondary transfer calibration standards set..... 25 20
SECTION I
GENERAL
1. Purpose and Scope. This bulletin provides information for the periodic calibration of
Differential Voltmeters AN/USM-98, AN/USM-98A, and AN/USM-98B (John Fluke Models
801, 801R, 801B, 801BR, and 801B/AG). It is to be used by personnel trained and qualified
in the use of calibration equipment.
2. Reporting of Equipment Publication Improvements. The reporting of errors,
omissions, and recommendations for improving this publication by the individual user
is encouraged. Reports should be submitted on DA Form 2028 (Recommended Changes
to Publications) and forwarded direct to: Commander, US Army Missile Materiel
Readiness Command, ATTN: DRSMI-MFPA, Redstone Arsenal, AL 35809.
3. Descriptive Data
a. Identification
Nomenclature DIFFERENTIAL VOLTMETER
Military designation AN/USM-98, AN/USM-98A, and AN/USM-98B
Manufacturer John Fluke
Model number 801, 801R, 801B, 801BR, and 801B/AG
Reference Manufacturer's instruction manual, TM 11-6625-599-12,
and TM 11-6625-599-45
2
TB 9-6625-1866-50
b. Specifications
AN/USM-98 (J-F 801 AND J-F 801R):
Input requirement1 100 to 130 vac, 60 Hz, 60 w
Stability of reference supply1