MIL-C-25F
4.6.13.1 Liquid-impregnated capacitors and solid-impregnated capacitors. Liquid-impregnated and solid-
impregnated capacitors shall be tested in accordance with method 112 of MIL-STD-202, test condition A, except that
bath temperature shall be as follows:
For characteristics E and F: +85°C +3°C, -0°C.
For characteristic K: +125°C +3°C, -0°C.
4.6.13.2 Liquid-filled capacitors. Liquid-filled capacitors shall be tested in accordance with method 112 of MIL-
STD-202, test condition A, for 10 minutes on each of two opposite sides at test temperature as follows:
For characteristic E and F: +85°C +3°C, -0°C.
For characteristic K: +125°C +3°C, -0°C.
4.6.14 Low ambient temperature and capacitance change with temperature (see 3.16).
4.6.14.1 Low ambient temperature. Capacitors shall be placed in a chamber maintained at -55°C ± 3°C, and a
rated dc voltage shall be applied at this condition for 48 ± 4 hours. The air within the conditioning chamber shall be
circulated.
4.6.14.2 Capacitance change with temperature. At the conclusion of the test specified in 4.6.14.1, capacitance
measurements shall be made as specified in 4.6.4, except that the measurement shall be made at -55°C ± 3°C,
+25°C ± 5°C, the applicable high-test temperature, and +25°C ± 5°C. The -55°C measurement shall be made before
the capacitors are removed from the conditioning chamber. The measurement at each temperature shall be recorded
when two successive readings taken at 5 minute intervals indicate no change in capacitance. Initial +25°C
measurement shall be used as the reference measurement to determine the percent of capacitance change at the
low and high-test temperatures. Capacitors shall then be visually examined for evidence of breakdown, arcing, and
other visible mechanical damage.
4.6.15 Life (see 3.17). Capacitors shall be tested in accordance with method 108 of MIL-STD-202, test condition B
(250 hours +8 hours, -0 hours). The following details shall apply:
a. Electrical load: 120 percent of rated dc voltage.
b. Final measurements (at +25°C):
(1) Insulation resistance:
(a)
Terminal to terminal: Not less than 30 percent of the value specified in table IV.
(2) Capacitance:
(a)
Characteristic E and F: Within 10 percent of initial value.
(b)
Characteristic K: Within 5 percent of initial value.
(3) Dissipation factor:
(a)
Characteristics E and K: Change not more than 1 percent from initial value.
(b)
Characteristic F: Change not more than 1.5 percent from initial value.
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