MIL-R-93 Resistors, Fixed, Wire-Wound, Accurate, General Specification ForThis specification covers the general requirements for accurate, wire-wound, fixed resistors having a maximum resistance tolerance of 1 percent, with the winding protected against high humidity. The resistors are rated for continuous full load operation at any ambient temperature up to 125 Degrees C, and derated up to 145 Degrees C. They are not capable for application where alternating current ac characteristics are of critical importance. Performance characteristics are in accordance with table I.

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MIL-R-93F

4.6.2  Group A inspection.  Group A inspection shall consist of the examination and test specified in table VIII, and shall be made on the same set of sample units, in the order shown.

TABLE VIII.  Group A inspection.

4.6.2.1  Subgroup 1.

4.6.2.1.1  Sampling plan.  A sample of parts from each inspection lot shall be randomly selected in accordance with table IX.  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 IX.  If one or more defects are found in this second sample, the lot shall be rejected and shall not be supplied to this specification.  Resistance values in the samples shall be representative, and where possible, in proportion to the resistors in the inspection lot.

4.6.2.2  Subgroup 2.

4.6.2.2.1  Sampling plan.  Thirteen samples shall be selected randomly from each inspection lot and subjected to the subgroup 2 solderability test.  The manufacturer may use electrical rejects from subgroup

1 screening tests for all or part of the samples to be used solderability testing.  If there are one or more defects, the lot shall be considered to have failed.

TABLE IX.  Group A sampling plan.

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