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

4.3 Inspection conditions and precautions.

4.3.1 Conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with the

4.3.2 Precautions. Adequate precautions shall be taken during tests to prevent condensation of moisture on

resistors, except during the moisture resistance tests.

4.4 Qualification. Qualification inspection shall be performed at a laboratory acceptable to the Government

(see 6.3) on sample units produced with equipment and procedures normally used in production.

4.4.1 Sample. The number of sample units comprising a sample of resistors to be submitted for qualification

inspection shall be as specified in the appendix to this specification. The sample shall be taken at random from a

production run and shall be produced with equipment and procedures normally used in production. The sample units

shall have been subjected to and passed the requirements of group A inspection (see 4.6.2). Qualification shall not

be granted if group A inspection requirements are not met. Each resistor style shall be qualified separately (see 3.1).

4.4.2 Test routine. Sample units shall be subjected to the qualification inspection specified in table V in the order

shown. All sample units, with the exception of those for groups II and VIII inspection, shall be subjected to the

inspections and tests of group I. The sample units shall then be divided as specified in table V for group III, group IV,

group VI, and group VII, and subjected to the inspection for their particular group. In addition, four unenclosed

sample units shall be selected and subjected to group V inspection. An additional 14 sample units shall be subjected

to group II tests, with 6 sample units to the solderability test and 8 sample units to the resistance to solvents test. Ten

samples shall be subjected to the tests of group VIII.

4.4.3 Failures. Failures in excess of those allowed in table V shall be cause for refusal to grant qualification

approval.

4.5 Retention of qualification. Every 6 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 failure of the qualified product to meet the requirements of this specification. Verification

shall be based on meeting the following requirements:

The manufacturer has not modified the design of the item.

The specification requirements for the item have not been amended so far as to affect the character of the

item.

Lot rejection for group A inspection does not exceed the group A sampling plan.

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 inspection retesting shall be instituted.