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

4.5 Retention of qualification. Every 6 months, the manufacturer shall verify the retention of qualification to the

qualifying activity. In addition, the manufacturer shall immediately notify the qualifying activity whenever the group B

inspection results indicate failures of the qualified product to meet the requirements of this specification. Verification

shall be based on meeting the following requirements:

The manufacturer has not modified the design of the item.

The specification requirements for the item have not been amended so far as to affect the character of the

item.

Lot rejection for group A inspection does not exceed the group A sampling plan.

The requirements for group B inspection are met.

When group B requirements were not met and the manufacturer has taken corrective action satisfactory to the

Government, group B inspection retesting shall be instituted.

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B

inspection.

4.6.1.1 Inspection lot. Inspection lot as far as practicable, shall consist of all resistors of the same style and

characteristic regardless of the resistance value (combining of all terminal types except L is acceptable) produced in

a period not to exceed 30 days, produced under essentially the same conditions, and offered for inspection at one

time.

4.6.2 Group A inspection. Group A inspection shall be as specified in table VI. The tests shall be conducted in the

order shown.

4.6.2.1 Sampling plan.

4.6.2.1.1 Subgroup 1. A sample of parts from each inspection lot shall be randomly selected in accordance with

table VII. If one or more defects are found, the lot shall be reworked or screened and defectives removed. After

reworking or screening and removal of defects, a new sample of parts shall be randomly selected in accordance with

table VII. If one or more defects are found in this second sample, the lot shall be rejected and shall not be supplied to

this specification.

4.6.2.1.2 Subgroup 2. A sample of parts from each inspection lot shall be randomly selected in accordance with

table VII. If one or more defects are found, the lot shall be reworked or screened and defectives removed. After

reworking or screening and removal of defects, a new sample of parts shall be randomly selected in accordance with

table VII. If one or more defects are found in the second sample, the lot shall be rejected and shall not be supplied to

this specification.