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

4.8 Methods of inspections.

4.8.1 Visual and mechanical inspection. Resistors shall be examined to verify that the materials, design,

construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements

(see 3.1, 3.4 to 3.4.1.3 inclusive, and 3.24 to 3.27 inclusive).

4.8.2 DC resistance (see 3.8). Resistors shall be tested in accordance with method 303 of MIL-STD-202. The

following details and exceptions shall apply:

Measuring apparatus: Different types of measuring test equipment (multimeters, bridges, or equivalent) are

permitted to be used on the initial and final readings of this test, provided the equipment is the same style,

model, or it can be shown that the performance of the equipment is equivalent or better.

Limit or error of measuring apparatus: �(0.1 percent + 0.00001 ohm), but not exceeding one-fourth of the

resistor tolerance or the resistance change limit for which the measurement is being made. Manufacturers,

at their option, may use an apparatus of less accuracy, provided the limits are reduced to fully compensate

for accuracy deviation.

Test voltage and currents: The test voltage and current shall be such that sufficient resolution is obtained

(see 4.8.2b) without an excessive amount of heating effect.

Points of measurement:

(1)

Two terminal devices: The point to point voltage measurement shall be made at a distance as

specified in the associated specification.

(2)

Four terminal devices: The associated specification shall identify voltage and current leads. If no

identification is given, a random determination will be made and this combination shall be used for any

one test, but not necessarily for all tests.

4.8.3 Solderability (see 3.9). Resistors shall be tested in accordance with method 208 of MIL-STD-202. The

following details shall apply:

All leads shall be tested.

The leads shall be dipped within .062 inch of the body.

4.8.4 Resistance to solvents (see 3.10). Resistors shall be tested in accordance with method 215 of MIL-STD-202.

The following details shall apply:

The marked portion of the resistor body shall be brushed.

The number of sample units shall be as specified in table V and table VIII.

Resistors shall be examined for mechanical damage and legibility of markings.