MIL-PRF-14409J
4.5.13 Shock (specified pulse) (see 3.16). Capacitors shall be tested in accordance with method 213 of MIL-
STD-202. The following details and exceptions shall apply:
a. Mounting: Capacitors shall be mounted by their normal mounting means.
b. Number and direction of applied shocks: Twenty; ten in each of two mutually perpendicular directions (five
blows in each of two directions). One of the test planes shall be parallel and the other perpendicular to the
cylindrical axis of the rotor.
c. Test condition: I.
d. Electrical load during shock: A potential of 125 percent of the specified dc rated voltage (see 3.1) shall be
applied between rotor and stator with the capacitor set at approximately 75 percent of maximum rated
capacitance.
e. Examination during and after shock: During the test, observation shall be made for momentary arcing or
intermittent contacts of 0.5 ms or greater duration. After test capacitors shall be visually examined for
evidence of breakdown, arcing, fractures, loosening of parts, or other visible mechanical damage.
4.5.14 Vibration, high frequency (see 3.17). Capacitors shall be tested in accordance with method 204 of MIL-
STD-202. The following details and exceptions shall apply:
a. Mounting: Capacitors shall be mounted by their normal mounting means. Lead-mounted capacitors
designed for printed-circuit mounting shall be seated firmly against a printed-wiring board or comparable
support to withstand forces encountered in service. Leads shall pass through mounting holes in the board
and shall be soldered on the opposite side of the printed-wiring board.
b. Measurements prior to vibration: Capacitors shall be set at approximately 75 percent of maximum rated
capacitance and capacitance shall then be measured as specified in 4.5.4.
c. Electrical-load conditions: During the test while capacitors are set as specified in (b) above, a potential of
125 percent of the dc rated voltage shall be applied between rotor and stator. Observation shall be made
for intermittent contacts of 0.5 ms or greater duration, momentary arcing, open-circuiting or short circuiting.
d. Test condition: B.
e. Direction of motion: In two directions; one perpendicular and one parallel to the axis of the rotor shaft.
f. Final measurements: After vibration, capacitance shall again be measured as specified in 4.5.4.
After completion of test, capacitors shall be examined for evidence of fracture, loosening of parts, or other mechanical
damage visible under 10 power magnification.
4.5.15 Barometric pressure (reduced, qualification only) (see 3.18). Unless otherwise specified (see 3.1),
capacitors shall be tested in accordance with method 105 of MIL-STD-202. The following details shall apply:
a. Method of mounting: Capacitors shall be mounted by their normal mounting means.
b. Test condition: D.
c. Test during subjection to reduced pressure: A dc potential equal to 50 percent of the dc rated voltage or 500
volts, whichever is less, shall be applied, for not less than 1 second nor more than 5 seconds, between the
terminals.
Capacitors shall be visually examined for evidence of damage, arcing, or breakdown.
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