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MIL-PRF-22097 Resistors, Variable, Nonwirewound, Adjustment Type, General Specification ForThis specification covers the general requirements for multi-turn lead screw actuated and single turn nonwirewound, variable resistors with a contact bearing uniformly over the entire surface of the entire resistive element, when positioned by the actuator. These resistors are capable of full load operation \(where maximum resistance is engaged\) at a maximum ambient temperature of 70 Degrees C and 85 Degrees C, and are capable for continuous operation when properly derated, at a maximum temperature of 125 Degrees C and 150 Degrees C \(see figure 1\). These resistors have a resistance of ┬▒10 percent \(see 3.1\).

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MIL-PRF-22097J
TABLE VI. Group A inspection.
Inspection
Requirement
Method
Sampling
Paragraph
Paragraph
plan
Subgroup 1 1/
Total resistance
End resistance
Contact resistance variation
Immersion
(terminal types P, W, X, Y)
Subgroup 2
Visual and mechanical
Inspection 2/
Subgroup 3 3/
Solderability
(terminal types P, W, X, Y)
1/  100 percent inspection may be used in lieu of sampling plan.
2/  Marking defects shall be charged only for illegible, incorrect, or incomplete marking. Any subsequent
electrical defect shall not be charged as a marking defect.
3/  The manufacturer may request the deletion of the subgroup 3 solderability test, provided 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 quality problems, the qualifying activity may require resumption
of the test.
TABLE VII. Group A sampling plan.
Subgroup 1
Subgroup 2
Lot size
Sampling plan
Sampling plan
1
to
25
100 percent
3
26
to
50
100 percent
5
51
to
90
100 percent
6
91
to
150
90
7
151
to
280
125
10
281
to
500
192
11
501
to
1,200
192
15
1,201
to
3,200
192
18
3,201
to
10,000
192
22
10,001
to
150,000
294
29
150,001
to
500,000
345
29
500,001
and above
435
29
14



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