MIL-PRF-49462C
4.7.2 Inspection of packaging. The sampling and inspection of the preservation, packing, and
container marking shall be in accordance with the requirements of section 5.
4.8 Methods of inspection.
4.8.1 Visual and mechanical examination. Resistors shall be examined to verify that the materials,
design, construction, physical dimensions, marking, and workmanship are in accordance with the
4.8.2 DC resistance (see 3.7). The dc resistance shall be measured in accordance with method 303 of
MIL-STD-202. The following details and exceptions shall apply:
a. 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.
b. Test voltage: Measurements of resistance shall be made by using the test voltages specified in
table X. The test voltage chosen, whether it be the maximum or a lower voltage which would still
provide the sensitivity required, shall be applied across the terminals of the resistor. This same
voltage shall be used whenever a subsequent resistance measurement is made.
TABLE X. DC resistance test voltages.
Resistance, nominal
Maximum
(ohms)
test voltage
(volts)
100 to
976 inclusive
3
1,000 to 9,760 inclusive
10
10,000 to 97,600 inclusive
30
100,000 or higher
100
c. Temperature: The dc resistance test specified in group I of table V shall be performed at +25°C
±2°C. For all other tests, unless otherwise specified herein, the temperature at which subsequent
and final resistance measurements are made in each test shall be within ±2°C of the temperature
at which the initial resistance measurement was made.
d. Humidity: Humidity shall be 50 percent.
4.8.3 Power conditioning (see 3.8).
4.8.3.1 Mounting. Resistors may be mounted in any position and allotted as much space as
necessary. Forced air cooling may be used to maintain a test ambient temperature of +20°C to +45°C.
The velocity of the forced air shall not exceed 500 feet per minute and there shall be no direct
impingement of the forced air upon the resistors.
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