MIL-PRF-39009E
4.8.5 Dielectric withstanding voltage (3.11).
4.8.5.1 Atmospheric pressure. Resistors shall be tested in accordance with method 301 of
MIL-STD-202. The following details and exceptions shall apply:
a. Special preparations: Resistors shall be mounted firmly on a metal plate by means of the normal
mounting hardware. The plate shall be of sufficient size to extend beyond the resistor extremities.
b. Magnitude of test voltage: As specified (see 3.1).
c.
Nature of potential: An ac supply at commercial line frequency and waveform.
d. Points of application of test voltage: Between the resistor terminals tied together and mounting
plate, making certain that there is good electrical contact between the metal of the mounting tab, if
any, and mounting
e. Measurement and examination: DC resistance shall be measured before the test as specified in
4.8.3. At the conclusion of the test, resistors shall be examined for evidence of flashover,
mechanical damage, arcing, and insulation breakdown.
4.8.5.2 Barometric pressure. Following the test specified in 4.8.5.1, resistors shall be tested in
a. Method of mounting: As specified in 4.8.5.1a.
b. Test condition: C.
c.
Magnitude of test voltage: As specified in 3.1.
d. Nature of potential: As specified in 4.8.5.1c.
e. Points of application of test voltage: As specified in 4.8.5.1d.
f.
Measurement and examination: DC resistance shall be measured before the test as specified in
4.8.3. At the conclusion of the test, resistors shall be examined for evidence of flashover,
mechanical damage, arcing, and insulation breakdown.
MIL-STD-202. The following details shall apply:
a. Test condition A.
b. Special preparation: As specified in 4.8.5.1a.
c.
Points of measurement: As specified in 4.8.5.1e.
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