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MIL-PRF-94 Resistors, Variable, Composition General Specification ForThis specification covers the variable resistors having a composition resistance element shaped in an arc, and a contact bearing uniformly thereon, so that a change in resistance is produced between the terminal of the contact and the terminal of either end of the resistance element when the operating shaft is turned. These resistors are capable of full load operation \(where maximum resistance is engaged\) at a maximum ambient temperature of 70 degrees C and are capable for continuous operation when properly derated, at a maximum temperature of 120 degrees C \(see 6.9\).

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MIL-PRF-94G

6.17 Subject (key word) listing.

Potentiometer

Taper

Resistance element shaped in an arc

Operating shaft

Switch

TABLE XVI. Performance requirements.

Style

RV2

RV4

RV5

RV6

RV7

RV8

Maximum ambient temperature at rated

70 C

wattage (see figure 7)

Maximum ambient temperature at zero

120OC

rated wattage derating (see figure 7)

Power rating in watts

Taper A (see 3.5.4.1)

1.0

2.0

0.5

panel rear

0.5

Tapers C and F (see 3.5.4.2)

0.5

1.0

0.25

0-2.0 1.6-0

0.25

Maximum percent change in resistance

Rotation life (see 3.10)

Load life (see 3.12)

Moisture resistance (see 3.13)

10 max

Low temperature storage (see 3.14)

Low temperature operation (see 3.15)

Thermal shock (see 3.16)

Shock (specified pulse) (see 3.18)

Vibration, high frequency (see 3.19)

Insulation resistance (after moisture

100 megohms

resistance, see 3.13)

Resistance tolerance � percent

10 and 20

(see table V)

TABLE XVII. Styles and characteristics.

Style and characteristics

Supersedes style and

Supersedes styles and

in MIL-R-94

characteristic in MIL-R-94C

characteristics in MIL-R-94B

RV2Y

RV2 characteristic X and Y

RV4Y

RV4 characteristic X and Y

RV5Y

RV5 characteristic X and Y

RV6Y

RV1 and RV6 characteristic X an Y