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MIL-PRF-27208 Resistor, Variable, Wirewound, Nonprecision General Specification ForThis 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 entire resistive element, wound linearly, when positioned by an actuator. These resistors are capable of full load operation \(where maximum resistance is engaged\) at maximum ambient temperature of 85 Degrees C, and are capable for continuous operation when properly derated, at a maximum temperature of 150 Degrees C \(see figure 2\). These resistors have a resistance tolerance of ┬▒5 percent \(see 3.1\).

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MIL-PRF-27208F
TABLE V. Group A inspection. 1/
Method
Sampling
Inspection
Requirements paragraph
paragraph
plan
Subgroup I
Total resistance
Continuity
Actual effective electrical travel
Absolute minimum resistance
End resistance
Peak noise
Immersion
(applicable to terminal types P, W, X, and Y)
Subgroup 2
Visual and mechanical examination 1/
3.29 to 3.32 incl, and 3.34.
Subgroup 3 2/
Solderability
(applicable to terminal types P, W, X, and Y)
1/ Marking defects shall be charged only for illegible, incorrect, or incomplete marking. Any subsequent electrical
defect shall not be charged as a marking defect.
2/ The manufacture may request the deletion of the subgroup 3 solderability test, providing an in line process
control system for assessing and assuring the solderability of leads can be validated and approved by the
qualifying activity. Deletion of the test does not relieve the manufacturer from meeting this test requirement in
case of dispute. If the design, material, construction, or processing of the part is changed or if there are any
problems, the qualifying activity may require resumption of the test.
4.6.1.2.1 Sampling plan.
4.6.1.2.1.1 Subgroup I. A sample of parts from each inspection lot shall be randomly selected in accordance with
table VI. If one or more defects are found, the lot shall be screened and defectives removed. After screening and
removal of defectives, a new sample of parts shall be randomly selected in accordance with table VI. If one or more
defectives are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
4.6.1.2.1.2 Subgroup 2. A sample of parts from each inspection shall be randomly selected in accordance with
table VI. If one or more defects are found, the lot shall be screened and defectives removed. After screening and
removal of defectives, a new sample of parts shall be randomly selected in accordance with table VI. If one or more
defectives are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
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