MIL-PRF-49465 Resistor, Fixed, Metal Element, Power Type, Very Low Resistance Values, General Specification ForThis specification covers the general requirements for power type, low value \(1 ohm and below\), fixed resistors \(2 terminal and 4 terminal\) for use in electrical, electronic, communications, and associated equipment. Included are precision resistors of ??1 percent, ??3 percent, and ??5 percent initial resistance tolerances with power ratings ranging from 3 watts to 5 watts at +25 degrees C derated to 0 power at +275 degrees C.

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MIL-PRF-49465C

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.

4.6.1.1 Inspection lot. An inspection lot, as far as practical, shall include resistors of any style within a given group

shown in table VI without regard to resistance value or resistance tolerance, produced under essentially uniform

conditions and offered for inspection at one time. Resistors that differ in design, construction, materials, and terminal

type shall not be included in one lot.

4.6.1.2 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.

4.6.2 Group A inspection. Group A inspection shall consist of the inspections specified in table VI, and shall be

made on the same set of sample units, in the order shown.

TABLE VI. Group A inspection.

Requirement

Method

Number of

Inspection

paragraph

samples

Subgroup 1

100 percent

DC resistance

inspection

3.8

4.8.2

Subgroup 2

3.1, 3.3 to 3.4.1.1,

Visual and mechanical inspection

3.4.1.3, and 3.24

4.8.1

See table VII

Terminals

Markings

Subgroup 3

Solderability

4.6.2.1 Subgroup 1. Subgroup 1 tests shall be performed on a production lot basis on 100 percent of the products

supplied under this specification. Units that are out of resistance tolerance, or which experience a change in

resistance greater than that permitted for the tests of this subgroup shall be removed from the lot. Lots having more

than 10 percent total rejects, due to exceeding the specified resistance change limit shall not be furnished on

contracts.

4.6.2.2 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 rescreened and defects removed. After 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.

4.6.2.3 Subgroup 3 (solderability).

4.6.2.3.1 Sampling plan. Six 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.