MIL-DTL-3965H
4.7.8 Shock (specified pulse) (see 3.12). Capacitors and brackets shall be tested in accordance with method 213
of MIL-STD-202. The following details shall apply:
a.
Special mounting means: Capacitors shall be rigidly mounted on a mounting fixture by normal mounting
means. 1/ Capacitors with axial wire-lead terminals shall be rigidly mounted on a mounting fixture by the
body with their terminals secured to rigidly supported stud-terminals so spaced that the length of each
terminal from the capacitor is approximately .375 inch (9.53 mm) when measured from the edge of the
supporting stud-terminal. Capacitor terminals shall be within 30 degrees of being parallel. When securing
capacitor terminals, care shall be taken to avoid pinching the capacitor terminals.
b.
Test condition: I (100 g's).
c.
Measurement and electrical loading during shock: DC rated voltage (see 3.1) shall be applied to the
capacitor during test. Observation shall be made to determine intermittent contact or arcing or open or
short-circuiting. Detecting equipment shall be sufficiently sensitive to detect any interruption of 0.5 ms or
greater duration.
d.
Examinations after test: Capacitors shall be visually examined for arcing, break down, mechanical damage,
and leakage of electrolyte. Brackets shall be visually examined for mechanical damage.
4.7.8.1 Bracket. When brackets alone are being tested, each bracket shall support a capacitor in a case with
which it is normally used (see 3.1).
4.7.9 Vibration, high frequency (see 3.13). Capacitors and brackets shall be tested in accordance with method
204 of MIL-STD-202. The following details and exceptions shall apply:
a.
Mounting of specimens: The body of the capacitor shall be rigidly mounted to the vibration-test apparatus.
NOTE: The CL50 series capacitors shall be mounted with the appropriate bracket (see 3.1).
b.
Test condition: D (20 g's), with the following exception: For capacitors with axial wirelead terminals, the
motion shall be applied for a total of 8 hours (4 hours in each of two mutually perpendicular directions, one
parallel and the other perpendicular to the cylindrical axis).
c.
Measurements: During the last 30 minutes of vibration in each direction, an electrical measurement shall be
made on the capacitors to determine intermittent contacts or, open or, short-circuiting. Detecting equipment
shall be sufficiently sensitive to detect any interruption of 0.5 ms or greater duration.
d.
Examinations after test: Capacitors shall be visually examined for mechanical damage and leakage of
electrolyte. Brackets shall be visually examined for mechanical damage.
4.7.9.1 Bracket. When brackets alone are being tested, each bracket shall support a capacitor in a case with
which it is normally used (see 3.1).
4.7.10 Thermal shock (see 3.14). Capacitors and brackets shall be tested in accordance with method 107 of MIL-
STD-202. The following details and exceptions shall apply:
a.
Conditioning prior to first cycle: 15 minutes at room ambient conditions (see 4.3.1).
Test condition: A, except step 3 shall be +125°C, +7°C, -0°C.
b.
c.
Number of cycles: Capacitors: 30 (see 6.4.2.1).
Brackets:
5
d.
Measurements before cycling: Not applicable.
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