MIL-C-18312G
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° ±3°C 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° ±3°C (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 1. Breakdown voltage.
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