TM 11-6625-599-12
CHAPTER 1
INTRODUCTION
GENERAL
Section I.
1-3. Forms and Records
1-1. Scope
a. This manual describes Voltmeter, Elec-
a. Reports of Maintenance and Unsatisfac-
tronic AN/USM98A (fig. 1) and covers its
tory Equipment. Use equipment forms and rec-
operation, adjustment, and operator and or-
ords in accordance with instructions in TM 38
ganizational maintenance. It includes opera-
750.
tion under usual conditions, cleaning and in-
spection of the equipment, and replacement of
b. Report of Damaged or Improper Ship-
parts available to the operator and organiza-
ment. Fill out and forward DD Form 6 (Re-
tional repairman. Throughout this manual,
port of Damaged or Improper Shipment) as
Voltmeter, Electronic AN/USM98A will be
p r e s c r i b e d i n AR 700-58 (Army),
r e f e r r e d to as the vacuum-tube voltmeter
N A V S A N D A Publication 378 (Navy), and
(vtvm).
AFR 714 (Air Force).
b. The organizational repair parts and spe-
c. Reporting of Equipment M a n u a l I n -
cial tools list will appear in TM 11-6625599
provements. The direct reporting, by the in-
20P.
dividual user, of errors, omissions, and recom-
1-2. Index of Equipment Publications
mendations for improving this equipment man-
ual is authorized and encouraged. DA Form
Refer to the latest issue of DA Pam 3104
2028 will be used for reporting these improve-
to determine whether there are new editions,
ments. This form may be completed by use of
changes, or additional publications pertain-
pencil, pen, or typewriter. DA Form 2028
ing to your equipment. D e p a r t m e n t of the
will be completed in triplicate and forwarded
Army Pamphlet No. 3104 is an index of cur-
by the individual using the manual. The orig-
rent technical manuals, technical bulletins,
inal and one copy will be forwarded direct to:
supply manuals (types 4, 6, 7, 8, and 9), sup-
Commanding General, U.S. Army Electronics
ply catalogs (type CL), supply bulletins, lubri-
Command, ATTN: AMSEL-MR-MA, Fort
cation orders, and modification work orders
Monmouth, New Jersey 07703. One informa-
that are available through publications supply
tion copy will be furnished to the individual's
channels. The index lists the individual parts
immediate supervisor (officer, noncommis-
(-10, -20, -35P, etc) and the latest changes to
sioned officer, supervisor, etc).
and revisions of each equip-merit publication.
DESCRIPTION AND DATA
Section Il.
a. vacuum-tube voltmeter 01. as a differential
1-4. Purpose and Use
voltmeter.
The vtvm is a portable, precision test equip-
1-5. Technical Characteristics
ment, used to measure voltages between 0 and
500 volts direct current (dc) and resistances
a. Specifications When U s e d as Vacumn
between 1 and 500,000 megohms. Voltages
Tube Voltmeter ( N U L L s w i t c h i n V T V M
may be measured by use of the vtvm either as
position).
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