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|  MIL-C-18312F
4.7.6 Insulation resistance (see 3.9). Capacitors shall be tested in accordance with method 302 of MIL-STD-202.
The following details and exceptions shall apply:
a. Test potential: A potential equal to the rated dc voltage or 500 vdc, whichever is less.
b. Points of measurement:
Terminal to terminal: When the case is a terminal, insulation resistance shall be measured between
terminals at high ambient temperature, and at 25 3C or corrected thereto (see
3.9.1). For quality conformance inspection, measurement at high ambient
temperature is required only for those items to be subjected to life test.
Terminal to case: When the case is not a terminal, the measurement shall be made between each
terminal and the case at 25 3C (see 3.9.2).
c. Electrification time: Not to exceed 2 minutes.
4.7.7 Barometric pressure (reduced) (qualification only) (see 3.10). Capacitors shall be tested in accordance with
method 105 of MIL-STD-202. The following details shall apply:
a. Method of mounting: Not applicable.
b. Test condition letter: As specified (see 3.1).
c. Test during subjection to reduced pressure: A test potential equal to 125 percent of the DC rated voltage
(see 3.1) shall be applied between each terminal and the case of the capacitor (except where a terminal
and case are electrically identical) for at least 1 minute. However, for tubular styles the potential need not
exceed the appropriate value as specified in figure 1.
FIGURE I. Breakdown voltage.
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