MIL-PRF-83530C
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B
inspections.
4.6.1.1 Inspection and production lot.
4.6.1.1.1 Inspection lot. An inspection lot shall consist of all resistors of the same part number, under essentially
the same conditions and offered for inspection during a period of 1 month.
4.6.1.1.2 Production lot. A production lot consists of parts manufactured from the same basic raw materials,
processed under the same specifications and procedures, and produced with the same equipment. Each production
lot of parts should be a group identified by a common manufacturing record through all significant manufacturing
operations, including the final assembly operation. The final assembly operation shall be considered the last major
assembly operation, such as casing, hermetic sealing, or lead attachment, rather than painting or marking, for
example.
4.6.1.2 Group A inspection. Group A inspection shall consist of the inspections specified in table III and shall be
made on the same set of sample units, in the order shown.
4.6.1.2.1 Sampling plan.
4.6.1.2.1.1 Subgroup 1. Subgroup 1 tests shall be performed on 100 percent of the product supplied under this
specification. Resistors which fail to meet the requirements of the tests of this subgroup shall be removed from the
lot. Lots having more than 10 percent total rejects shall not be furnished on contracts.
4.6.1.2.1.2 Subgroup 2. A sample of parts from each inspection lot shall be randomly selected in accordance with
table IV. If one or more defects are found, the lot shall be reworked or screened and defectives removed. After
reworking or screening and removal of defectives, a new sample of parts shall be randomly selected in accordance
with table IV. If one or more defects are found in this second sample, the lot shall be rejected and shall not be
supplied to this specification.
4.6.1.2.1.3 Subgroup 3 (solderability).
4.6.1.2.1.3.1 Sampling plan. A sample of parts from each inspection lot shall be randomly selected in accordance
with table IV and subjected to the subgroup 3 solderability test. If there are one or more defects, the lot shall be
considered to have failed.
4.6.1.2.1.3.2 Rejected lots. In the event of one or more defects, the inspection lot is rejected. The manufacturer
may use one of the following options to rework the lot:
a.
Each production lot that was used to form the failed inspection lot shall be individually submitted to the
solderability test as required in 4.8.9. Five samples shall be selected from each production lot that formed
the failed inspection lot. Production lot samples that pass the solderability test are available for shipment.
Production lots failing the solderability test can be reworked only if submitted to the solder dip procedure in
4.6.1.2.1.3.2b.
b.
The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip process per
the appendix A. Following the solder dip, the electrical measurements required in group A, subgroup 1, tests
shall be repeated on 100 percent of the lot. The PDA for the electrical measurements shall be as for the
subgroup 1 tests. Thirteen additional samples shall then be selected and subjected to the solderability test
with zero defects allowed. If the lot fails this solderability test the lot may be reworked a second time and
retested. If the lot fails the second rework, the lot shall be considered rejected and shall not be furnished
against the requirements of this specification.
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