INCH-POUND
MIL-PRF-12934/30F
25 August 2009
SUPERSEDING
MIL-PRF-12934/30E
1 February 1999
PERFORMANCE SPECIFICATION
RESISTORS, VARIABLE, WIREWOUND, PRECISION,
STYLE RR3900
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
The requirements for acquiring the product described herein shall
consist of this specification sheet and MIL-PRF-12934.
1. SCOPE
1.1 Scope. This specification covers the requirements for style RR3900, variable, wirewound, precision resistors.
1.2 Part or Identifying Number (PIN). Variable resistors covered by this specification must be identified by a PIN
which must be in the following form.
Single-section (cup) resistors
C
2
A
7
J
103
RR3900
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
⏐
Style
Function
Class and
Rotational life
Resistance
Resistance
Function conformity
and shaft
center tap
characteristic
(1.2.6)
temperature
tolerance and
length
(1.2.2)
(1.2.4)
characteristic
resistance
(1.2.1)
(1.2.3)
tolerance
characteristic
(1.2.5)
1.2.1 Function and shaft length. The function and shaft length applicable to this specification is identified by a
single symbol in accordance with table I.
TABLE I. Function and shaft length.
Shaft length tolerance
Symbol
Function
±0.03125 (.79) 1/
C
0.625 (15.88)
Linear
D
0.750 (19.05)
Linear
E
0.875 (22.23)
Linear
F
1.000 (25.40)
Linear
1/ Metric equivalents are in parentheses.
Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus,
ATTN: DSCC VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or by email Resistor@dla.mil. Since contact
information can change, you may want to verify the currency of this address information using the ASSIST Online
database at https://assist.daps.dla.mil/.
AMSC N/A
FSC 5905
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