MIL-R-27208-4 Resistor, Variable, Wirewound, Adjustment Type, Lead Screw Actuated, Style Rt22This specification covers the requirements for style RT22 adjustment type, lead screw actuated, wirewound, variable resistors.

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MIL-R-27208/4J

DEPARTMENT OF DEFENSE SPECIFICATION

MIL-PRF-27208 - Resistor, Variable, Wire wound, Nonprecision, General Specification for.

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2.3 Order of precedence. In the event of a conflict between the text of this document, and the references cited herein (except for associated specifications, specification sheets, or MS sheets); the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 General. The requirements for acquiring the product described herein shall consist of this document and

MIL-PRF-27208 .

3.2 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified in figure 1.

3.3 Power rating. The power rating shall be 0.750 watt, based on full load operation at an ambient temperature of

85oC.

3.4 Nominal resistance value, maximum resolution, and maximum rated ac or dc working voltage. Nominal resistance values, maximum resolutions, and maximum rated ac or dc working voltages are specified in table I.

TABLE I. Nominal resistance value, maximum resolution, and maximum rated ac or dc working voltage.

Nominal resistance value

Maximum resolution 1/

Maximum rated ac or dc working voltage

Ohms

100

200

500

1,000

2,000

5,000

10,000 2/

20,000 3/

Percent

0.65

0.51

0.42

0.36

0.29

0.26

0.17

0.15

Volts

6.1

8.7

12.3

19.4

27.4

38.7

61.3

86.7

122.0

1/ Maximum resolution shown are theoretical.

2/ Value based on the use of wire having no less that a 0.001 inch nominal diameter.

3/ Value based on the use of wire having no less that a 0.0008 inch nominal diameter.

3.5 Actual effective electrical travel. The actual effective electrical travel shall be 20 turns minimum and 45 turns maximum.

3.6 Operating torque. The torque required to effect rotation shall be 5 inch-ounce maximum.

* 3.7 Termination "L". Termination "L" uses 100 percent tin platting on the internal tab (see 6.6).