Comments, suggestions, or questions on this document should be emailed to usarmy.apg.rdecom-
cerdec.mbx.standardization-crx@mail.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.dla.mil.
AMSC N/A FSC 5905
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
MIL-PRF-39015E
w/ Amendment 2
12 April 2016
SUPERSEDING
MIL-PRF-39015E
w/ Amendment 1
28 January 2011
PERFORMANCE SPECIFICATION
RESISTOR, VARIABLE, WIRE WOUND,
(LEAD SCREW ACTUATED),
NONESTABLISHED RELIABILITY, AND ESTABLISHED RELIABILITY,
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 nonestablished reliability (non-ER) and
established reliability (ER), lead screw actuated; wire wound variable resistors with a contact bearing uniformly over
the surface of the entire resistive element, wound linearly, when positioned by a multiturn lead screw actuator. These
resistors are capable of full load operation (when the maximum resistance is engaged), at a maximum temperature of
85ºC and are capable for continuous operation, when properly derated, at maximum temperature of 150ºC (see
3.6),
with a resistance tolerance of ±5 percent. The ER resistors have life failure rate (FR) levels ranging from 1.0 percent
to 0.001 percent per 1,000 hours (see 1.2.1.4). These FR levels are established at a 60 percent confidence level on
the basis of life tests.
1.2 Classification.
1.2.1 Part or Identifying Number (PIN). Resistors specified herein are identified by the PIN which consists of the
basic number, associated specification, and a coded number.
specification
designator (see
(see 1.2.1.3
designator
1.2.1.1 Style. The style is identified by the three-letter symbol "RTR" followed by a two-digit number; the letters
identify lead screw actuated, wire wound, variable resistors, and the number identifies the physical size.
1.2.1.1.1 Performance requirements. The performance requirements are identified in accordance with table I
.
1.2.1.2 Resistance value designator. The resistance value designator is a coded value which identifies the
resistance value, maximum resolution, and maximum rated working voltage (see 3.1).
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