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

FIGURE 2. Mounting straps for moisture - resistance test.

4.8.12 Terminal strength (All terminals on each resistor shall be tested) (see 3.18). Tests shall be in accordance

with method 211 of MIL-STD-202 with the following exceptions:

Test conditions: A and D. (Pull test and twist test, respectively.)

Measurement before test (A): DC resistance as specified in 4.8.2.

Method of holding (A): Resistors shall be clamped by one terminal lead for axial terminal and by the body

for radial lead.

Applied force (A): As specified (see 3.1) to each terminal.

Applied force (D): If the terminal configuration prevents performance of this test, special details will be as

specified (see 3.1).

Measurement after test (D): DC resistance as specified in 4.8.2 and examined for evidence of breaking and

loosening of terminals and chipping of coating.

4.8.13 Shock (specified pulse) (see 3.19). Resistors shall be tested in accordance with method 213 of MIL-STD-202.

The following details and exceptions shall apply:

Special mounting means: Resistors shall be rigidly mounted on appropriate jig fixtures with their bodies

restrained from movement and their leads supported at a distance of .375 �.062 inch from the resistor body.

These fixtures shall be constructed in a manner to insure that the points of the resistor mounting supports

will have the same motion as the shock table. Test leads used during this test shall be no larger than AWG

size 22 stranded wire, so that the influence of the test lead on the resistor will be held to a minimum. The

test lead length shall be no longer than necessary. In all cases, the resistors shall be mounted in relation to

the test equipment in such a manner that the stress applied is in the direction which would be considered

most detrimental.

Measurement before shock: DC resistance shall be measured as specified in 4.8.2.

Test condition: I.

Number and direction of applied shocks: The resistors shall be subjected to a total of 10 shocks in each of

two mutually perpendicular planes, one perpendicular and the other parallel to the longitudinal axis of the

resistor.

Measurement during shock: Each resistor shall be monitored to determine electrical discontinuity by a

method which shall at least be sensitive enough to monitor or register, automatically, any electrical

discontinuity of 0.1 millisecond or greater duration.