MIL-PRF-19 Resistor, Variable, Wirewound \(Low Operating Temperature\), General Specification ForThis specification covers the general requirements for variable resistors having a resistance element of wirewound on an insulating strip shaped in an arc, so that a contract bears uniformly on the resistance element when adjusted by a control shaft. These resistors are capable of full load operation at an ambient temperature of +40 degrees C and are capable of continuous operation when properly derated, at a maximum temperature of +105 degrees C.

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MIL-PRF-19E

1.2.1.7 Example of PIN. The PIN "RA20NASK502A" signifies:

A 2 watt, low temperature, wirewound, variable resistor of the dimensions specified (see 3.1).

RA20

Standard 0.375 inch long bushing.

No switch.

Slotted shaft 2.5 inches long.

502

Nominal total resistance value of 5,000 ohms.

Linear taper with resistance tolerance of �10 percent.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This

section does not include documents cited in other sections of this specification or recommended for additional

information or as examples. While every effort has been made to ensure the completeness of this list, document

users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this

specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a

part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are

those cited in the solicitation (see 6.2).

DEPARTMENT OF DEFENSE SPECIFICATION

Resistor, Variable, Wirewound (Low Operating Temperature), Style RA20

Resistor, Variable, Wirewound (Low Operating Temperature), Style RA30

DEPARTMENT OF DEFENSE STANDARDS

Test Methods Standard Electronics and Electrical Components Parts.

Environmental Engineering Considerations and Laboratory Tests.

DEPARTMENT OF DEFENSE HANDBOOKS

Screw Thread Standards for Federal Services.

or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094).

2.3 Non-Government publications. The following documents form a part of this document to the extent specified

herein. Unless otherwise specified, the issues of the documents cited in the solicitation or contract (see 6.2).

INTERNATIONAL ORGANIZATION for STANDARDS (ISO)

Equipment, Quality Assurance Requirements for Measuring - Part 1:

Meteorological Confirmation System for Measuring Equipment.

(Copies of this document are available online at https://www.iso.org/ or should be addressed to the American

National Standards Institute, 11 West 42nd Street New York, NY 10036.)

NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)

Laboratories, Calibration, and Measuring and Test Equipment.