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MIL-PRF-39002 Resistors, Variable, Wirewound, Semi-Precision, General Specification ForThis specification covers the general requirements for semi-precision, wirewound, variable, resistors having a resistance element of wire, wound on an arc shaped insulated form, so that a contact bears uniformly on the resistance element, when adjusted by a contact shaft. The electrical output \(in terms of percent of applied voltage\) is linear with respect to the angular position of the contact arm. These resistors are capable of full-load operation \(when the maximum resistance is engaged\) at a maximum ambient temperature of 85 Degrees C, and are suitable for continuous operation, when properly derated, at a maximum temperature of 135 Degrees C. These resistors have a tolerance of ??5 percent.

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MIL-PRF-39002C
4.4.4 Retention of qualification. Every 12 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:
a.
The manufacturer has not modified the design of the item.
b.
The specification requirements for the item have not been amended so far as to affect the character of the
item.
c.
Lot rejection for group A inspection does not exceed the group A sampling plan.
d.
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 retesting shall be instituted.
4.5 Conformance inspection.
4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B
inspection.
4.5.1.1 Inspection lot. Inspection lot, as far as practicable, shall consist of all resistors of the same style and
characteristic regardless of the resistance value produced in a period not to exceed 30 days, produced under
essentially the same conditions, and offered for inspection at one time.
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