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MIL-PRF-18546 Resistors, Fixed, Wire-Wound \(Power Type, Chassis Mounted\), General Specification ForThis specification covers the general requirements for power type, wire wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. The resistors have an initial resistance tolerance of ┬▒1 percent and a resistance temperature characteristic range from 30 ppm/Degrees C to 200 ppm/Degrees C depending upon the resistance value. They are not capable for application when the alternating current \(ac\) characteristics are of critical importance; however, provisions have been made to minimize the inductance.

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MIL-PRF-18546G
4.6.2 Group A inspection. Group A inspection shall consist of the inspection specified in table IV, and
shall be made on the same set of sample units, in the order shown.
TABLE IV. Group A inspection.
Inspection
Requirement
Method
Number of samples
paragraph
paragraph
Subgroup 1
DC resistance
See 4.6.2.1
Subgroup 2
Visual and mechanical inspections
Material
Dimensions
Design and construction
See 4.6.2.2
(other than dimensions)
inclusive
Marking
Soldering
Workmanship
Subgroup 3
Solderability 1/
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1/ The manufacturer may request the deletion of the subgroup 3 solderability test, provided an in line
or 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.
4.6.2.1 Subgroup 1. A sample of parts from each inspection lot shall be randomly selected in
accordance with table V. If one or more defects are found, the lot shall be rescreened and defects
removed. After screening and removal of defects, a new sample of parts shall be randomly selected in
accordance with table V. If one or more defects are found in the 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. A sample of parts from each inspection lot shall be randomly selected in
accordance with table V. If one or more defects are found, the lot shall be rescreened and defects
removed. After screening and removal of defects, a new sample of parts shall be randomly selected in
accordance with table V. If one or more defects are found in the second sample, the lot shall be rejected
and shall not be supplied to this specification.
4.6.2.3 Subgroup 3 (solderability).
4.6.2.3.1 Sampling plan. Five samples shall be selected randomly from each inspection lot and
subjected to the subgroup 3 solderability test. If there are one or more defects, the lot shall be
considered to have failed.
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