MIL-PRF-49462C
4.8.9 Dielectric withstanding voltage (see 3.14).
4.8.9.1 Atmospheric pressure. Resistors shall be tested in accordance with method 301 of
MIL-STD-202. The following details and exceptions shall apply:
a. Mounting: Resistors shall be clamped in the trough of a 90° Metallic V-block of such size that the
body of the resistor does not extend beyond the extremities of the block. The resistor leads shall
be so positioned that the distance between the resistor lead and any point of the V-block is not
less than the radius of the resistor minus the radius of the lead wire.
b. Initial measurement: DC resistance shall be measured as specified in 4.8.2.
c. Nature of potential: Alternating current (ac) supply at commercial line frequency (not more than
100 hertz and waveform).
d. Magnitude of test potential: Sine wave test potential of 900 volts rms.
e. Duration of application of test voltages: 1 minute.
f. Rate of application of test voltage: 100 volts per second.
g. Points of application of test voltage: Between the resistor terminals connected together and the
V-block.
h. Measurement after test: DC resistance shall be measured as specified in 4.8.2.
i. Examination after test: Resistors shall be examined for evidence of flashover, mechanical
damage, arcing, and insulation breakdown.
4.8.9.2 Barometric pressure (reduced). Resistors shall be tested in accordance with method 105 of
MIL-STD-202. The following details and exceptions shall apply:
a. Method of mounting: As specified in 4.8.9.1a.
b. Initial measurement: Dc resistance shall be measured as specified in 4.8.2.
c. Test voltage during subjection to reduced pressure: 450 volts rms.
d. Test condition letter: B.
e. Nature of potential: As specified in 4.8.9.1c.
f. Duration of test: 1 minute.
g. Points of application of test voltage: As specified in 4.8.9.1g.
h. Measurements after test: DC resistance shall be measured as specified in 4.8.2.
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