MIL-PRF-39001E
4.7.15 Moisture resistance (see 3.19). Capacitors shall be tested in accordance with
method 106 of MIL-STD-202. The following details and exceptions shall apply.
a. Number of cycles: Capacitors shall be subjected to twenty continuous temperature cycles.
b. Mounting: Capacitors shall be mounted by the leads in a manner that will keep the capacitor body from
touching the test fixture during test or measurement.
c. Conditioning prior to test: Capacitors shall be tested as specified in 4.7.11.1.
d. Polarization: A dc potential of 100 volts or rated volts, whichever is less, shall be applied across the
capacitor terminals of 50 percent of the units under test and no voltage applied to the other 50 percent.
e. Vibration: The vibration requirement of steps 7a and 7b shall not apply.
f. Final measurements: After completion of step 6 of the final cycle, capacitors shall be maintained at 25C
±5C, and 50 ±5 percent relative humidity for a period of 4 to 24 hours. Insulation resistance, DWV,
capacitance, and DF shall then be measured as specified in 4.7.5.1, 4.7.2, 4.7.6, and 4.7.7, respectively.
Capacitors shall then be examined for evidence of deterioration, permanent damage to the leads or case,
and corrosion on the leads.
4.7.16 Life (see 3.20). Capacitors shall be preconditioned for life test by subjecting them to a temperature of
-55C +0C, -2C for a minimum period of 48 hours. Capacitors shall then be subjected to the tests specified in
4.7.16.1 For qualification inspection (2,000 hours) (see 3.20).
4.7.16.1.1 Rated conditions. Capacitors shall be subjected to 100 percent of rated dc voltage at 125C ±3C or
150C ±3C, as applicable, for 2,000 hours +72 hours, -0 hour. During the test, the surge current shall be limited to
50 mA. At the conclusion of the test, capacitors shall be returned to the inspection conditions specified in 4.3.1, and
shall be visually examined for evidence of mechanical damage; the DWV, insulation resistance, capacitance, and DF
4.7.16.1.2 Accelerated conditions. Capacitors shall be tested as specified in 4.7.16 and 4.7.16.1.1, except that
the capacitors shall be subjected to 150 percent of rated dc voltage.
4.7.16.2 For quality conformance inspection (see 3.20).
4.7.16.2.1 For FRL M, P, R, and S. Capacitors shall be tested as specified in 4.7.16.1.2.
4.7.16.3 Extended life (see 3.20).
4.7.16.3.1 Following 2,000 hour qualification test. Capacitors shall be continued on test for an additional 8,000
hours +96 hours, -0 hour; measurements during and after exposure shall be accomplished after 2,000 hours +96
hours, -0 hour and every 2,000 hours +96 hours, -0 hour thereafter until a combined total of 10,000 hours +96 hours,
-0 hour have elapsed. The measurements are the same as those specified in 4.7.16.1.1.
4.7.17 Fungus (see 3.21). Capacitors shall be tested in accordance with method 508 of MIL-STD-810. Pretest
and post-test measurements are not required.
4.7.18 Resistance to solvents (see 3.22). Capacitors shall be tested in accordance with
method 215 of MIL-STD-202. The following details shall apply:
a. Portion of specimen to be brushed: That portion on which marking is present.
b. Number of specimens to be tested: As specified in table VIII.
c. Permissible extent of damage: As specified in 3.22.
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