AMSC N/A FSC 5905
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.
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INCH-POUND
MIL-PRF-12934L
25 August 2009
SUPERSEDING
MIL-PRF-12934K
14 April 2004
PERFORMANCE SPECIFICATION
RESISTOR, VARIABLE, WIREWOUND, 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, wirewound, 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 (see 3.1, 6.2, and 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 is 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).
RR09XXA2A7J103
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