MIL-PRF-20M
4.7.10 Vibration, high frequency (see 3.14). Capacitors shall be tested in accordance with method 204 of
MIL-STD-202. The following details and exception shall apply:
a. Mounting of specimens: Capacitors shall be rigidly mounted by the body. The mounting fixture shall be so
constructed as to preclude any resonances within the test range. An examination of the mounting fixture
shall be made on a vibrator. If any resonant frequencies are observed, adequate steps must be taken to
dampen the structure.
b. Electrical load conditions: During the test, a dc potential equal to 125 percent of the dc rated voltage (see
3.1) shall be applied between the terminals of the capacitor-element under test.
c. Test condition D: (20 g's).
d. Duration and direction of motion: 4 hours in each of two mutually perpendicular planes (total of 8 hours), one
parallel to and the other perpendicular to the major axis.
e. Measurements during vibration: As specified in 4.7.9c.
f. Examination and measurements after vibration: Capacitors shall be visually examined for evidence of
mechanical damage, and the capacitance, dissipation factor, dielectric withstanding voltage, and insulation
4.7.11 Thermal shock and immersion (see 3.15).
4.7.11.1 Thermal shock. Capacitors shall be tested in accordance with method 107 of MIL-STD-202. The
following details shall apply:
a. Test condition: A, except the maximum temperature shall be +85°C +3°C, -0°C, or +125°C +3°C, -0°C, as
applicable (see 3.1).
b. Measurement after cycling: Not applicable.
4.7.11.2 Immersion. Following thermal shock, capacitors shall be tested in accordance with method 104 of
MIL-STD-202. The following details shall apply:
a. Test condition: B.
b. Examinations and measurements after final cycle: Capacitors shall be visually examined for evidence of
corrosion and mechanical damage; the capacitance, dissipation factor, dielectric withstanding voltage, and
insulation resistance shall be measured as specified in 4.7.3, 4.7.4, 4.7.5, and 4.7.7.1, respectively.
4.7.12 Terminal strength (see 3.16). Capacitors shall be tested in accordance with method 211 of MIL-STD-202.
The following details and exceptions shall apply:
a. Test condition: A, applicable to all styles. Applied force: Unless otherwise specified (see 3.1), 5 pounds.
b. Test condition: C, applicable to radial-lead units only. Applied force: 1.0 pound +0.1 pound, -0 pound.
c. Test condition: D, applicable to axial-lead units only.
d. Examination after test: Capacitors shall be visually examined for evidence of loosening or rupturing of
terminals.
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