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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

TABLE VIII. Qualification inspection.

Examination or test

Requirement

Method

Number of failures

allowed 1/

Paragraph

paragraph

Group I

Visual and mechanical examination 2/

3.1, 3.3 to 3.4.4 inclusive, 3.4.5 to

3.4.8 inclusive, 3.20 to 3.22 inclusive

4.7.1

and 3.24 to 3.26 inclusive.

DC resistance

Torque

Dielectric withstanding voltage

Group 1A 3/

Immersion

Resistance to solvents

Group II

Solderability 4/

3.8

4.7.5

Group III

3.9

Resistance to soldering heat

Rotational life

Switch life 5/

Group IV

Load life

3.12

4.7.9

Group V

Moisture resistance

3.13

4.7.10

Group VI

Low temperature storage

3.14

4.7.11

Low temperature operation

Thermal shock

Group VII

Salt spray (corrosion)

3.17

4.7.14

Group VIII

Shock (specified pulse)

3.18

4.7.15

Vibration, high frequency

3.19

4.7.16

Group IX

Fungus

3.20

4.7.17

Failure of a resistor in one or more tests of a group shall be charged as a single defective.

Marking shall be considered defective only if the marking is illegible.

Applicable only to MIL-PRF-94/7 (RV8) (see 3.1).

Sample units subjected to group II shall not have been subjected to group I.

Not applicable to locking bushings type resistors.