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NPFC - MIL-R-27208

RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR

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Organization: NPFC
Publication Date: 24 August 1992
Status: active
Page Count: 28
scope:

This specification covers the general requirements for multiturn, lead-screw actuated and single turn wire-wound, variable resistors with a contact bearing uniformly over the entire surface of the entire resistive element, wound linearly, when positioned by an actuator. These resistors are capable of full load operation (where maximum resistance is engaged) at a maximum ambient temperature of 85°C, and are suitable for continuous operation when properly derated, at a maximum temperature of 150°C (see figure 2). These resistors have a resistance tolerance of ±5 percent (see 3.1).

The PIN shall be in the following form and as specified (see 3.1 and 6.2):

The style is identified by the two-letter symbol "RT" followed by a two-digit number. The letters identify adjustment type, wire-wound, variable resistors and the number identifies the physical size.

The resistance temperature characteristic of the completed resistor is identified by a single letter in accordance with table I. TABLE I. Characteristics.

Symbol Maximum resistance Parts per million temperature characteristic per °C (ppm) 1/ in percent per °C 1/ ------------------------------------------------------------ C 0.005 ±50 1/ Referred to an ambient temperature of 25°C.

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: 2750 LOG/ESP Gentile Station, 1060 Hamilton Street, Dayton, OH 45444-5400 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The temperature characteristic is identified by a single digit number in accordance with table II. TABLE II. Temperature characteristic.

Maximum resistance Parts per million Symbol temperature characteristic per °C (ppm) in percent per °C ----------------------------------------------------------- °C °C 2 85 150

The terminals are identified by a single letter in accordance with table III. TABLE III. Terminals.

Symbol Type of terminal --------------------------------------------------- L Flexible, insulated wire leads P Printed circuit pins W 1/ Printed circuit pins (edge-mounted) X 2/ Printed circuit pins (edge-mounted, alternate configuration) Y 3/ Printed circuit pin (staggered) 1/ Available only in essentially square styles. Pins extend from the edge 180° away from the adjustment head, and are parallel to the longitudinal axis of the adjustment screw. 2/ Available only in essentially square styles. Pins extend from edge, 90° away from the adjustment head, and are perpendicular to the longitudinal axis of the adjustment screw. 3/ Applicable only to style RT12.

The nominal resistance value expressed in ohms is identified by a three-digit number; the first two digits represent significant figures and the last digit specifies the number of zeros to follow. The following are examples of symbols for resistance values:

100 = 10 ohms 101 = 100 ohms 102 = 1,000 ohms

The PIN RT10C2P102 signifies:

RT10 - Adjustment type, wire-wound, variable resistor of the dimensions specified (see 3.1). C - Having a resistance temperature characteristic of 0.005 percent ±50 ppm) per °C. 2 - Having a temperature characteristic capable of operation at 85°C maximum and derated, at 150°C maximum (see 3.5). P - Having printed circuit pins. 102 - Having a nominal total resistance value of 1,000 ohms.

intended Use:

Resistors covered by this specification are intended for use in electronic equipment, and are used for matching, balancing, and adjusting circuit variables in computers, telemetering equipment,... View More

Document History

August 8, 2019
RESISTOR, VARIABLE, WIREWOUND, NONPRECISION GENERAL SPECIFICATION FOR
Scope. This specification covers the general requirements for multiturn, lead-screw actuated and single turn wirewound, variable resistors with a contact bearing uniformly over the entire surface of...
April 24, 2017
RESISTOR, VARIABLE, WIREWOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wirewound, variable resistors with a contact bearing uniformly over the entire surface of the...
September 18, 2013
RESISTOR, VARIABLE, WIREWOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wirewound, variable resistors with a contact bearing uniformly over the entire surface of the...
January 28, 2011
RESISTOR, VARIABLE, WIREWOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wirewound, variable resistors with a contact bearing uniformly over the entire surface of the...
October 11, 2006
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wire wound, variable resistors with a contact bearing uniformly over the entire surface of the...
June 13, 2001
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wire wound, variable resistors with a contact bearing uniformly over the entire surface of the...
March 16, 1998
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 5, 1997
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
March 14, 1997
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
April 21, 1995
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
MIL-R-27208
August 24, 1992
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
This specification covers the general requirements for multiturn, lead-screw actuated and single turn wire-wound, variable resistors with a contact bearing uniformly over the entire surface of the...
February 20, 1987
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
August 6, 1982
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
October 23, 1973
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
October 22, 1970
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 24, 1934
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 13, 1968
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 13, 1968
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
March 14, 1968
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
August 9, 1967
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
June 6, 1966
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 27, 1962
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
April 9, 1962
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
April 9, 1962
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
December 18, 1959
RESISTOR, VARIABLE, WIRE WOUND, NONPRECISION GENERAL SPECIFICATION FOR
A description is not available for this item.
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