INCH-POUND
MIL-PRF-12934J
1 February 1999
SUPERSEDING
MIL-R-12934H
14 March 1974
PERFORMANCE SPECIFICATION
RESISTOR, VARIABLE, WIRE-WOUND, PRECISION
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope This specification covers the general requirements for precision, wire-wound, variable resistors whose
electrical output (in terms of percent of applied voltage) are linear or nonlinear with respects to the angular position
of the shaft. This specification includes requirements for linear and nonlinear, single turn and multiturn, single-
section (cup) and multisection variable resistors. These resistors are capable of full-load operation at maximum
ambient temperatures of 70
o
C and 85
o
C and are suitable for continuous operation, when properly derated, to
maximum temperatures of 125
o
C and 150
o
C (3.1, 6.2, and see figure 10). This specification includes requirements
for category I, category II, and category III precision resistors as described herein (see 3.2).
1.2 Classification:
1.2.1 Part or Identifying Number (PIN).
a. Category I resistors: The PIN completely describes the category I resistors of this specification.
Single-section (cup) resistors
RR0900 A 2 A 7 J 103
Style
(1.2.1.1)
Function
and shaft
length
(1.2.1.2)
Class and
center tap
(1.2.1.3)
Resistance
temperature
characteristic
(1.2.1.4)
Rotational life
characteristic
(1.2.1.5)
Function conformity
tolerance and
resistance tolerance
characteristic
(1.2.1.6)
Resistance
(1.2.1.7)
b. Category II resistors: The PIN of 1.2.1 will be modified by changes in style designation (see 1.2.1.1), when
used to describe a category II resistor. The PIN in this case does not fully describe the individual resistor.
The resistor in this case is completely identified only by the addition of a drawing number in the marking
(see 3.34 and 6.2.2).
RR09XX A 2 A 7 J 103
Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving
this document should be addressed to: Defense Supply Center, Columbus, ATTN: DSCC-VAM, 3990 East Broad Street,
Columbus, OH 43213-1199 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing
at the end of this document or by letter.
AMSC N/A FSC 5905
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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