MIL-C-62F
4.5.11 Moisture resistance (see 3.14). Capacitors shall be tested in accordance with method 106 of MIL-STD-202.
The following details and exceptions shall apply:
a.
Mounting: Except during examination and measurements, rigidly mounted by normal mounting means (see
3.1).
b.
Conditioning prior to first cycle: Not applicable.
c.
Initial measurements: Not applicable.
Polarization and load: During step 7 of the ninth cycle, the dc rated voltage (see 3.1), shall be applied to
d.
the capacitor for 30 minutes. If the subcycle is performed during the ninth cycle, the voltage shall be
applied after step 7b.
e.
Final measurements:
(1)
For capacitors with insulating sleeves: Within 10 minutes after removal from the controlled
atmosphere, the insulation resistance shall be measured as specified in 4.5.11.1. Within 5 minutes
after measurement of insulation resistance, capacitors shall be subjected to dielectric withstanding
voltage as specified in 4.5.11.2.
(2)
For all capacitors: After the final cycle and within 2 to 6 hours after removal of capacitors from the
humidity chamber, dc leakage, capacitance, and dissipation factor shall be measured as specified in
4.5.3, 4.5.4, and 4.5.5, respectively.
f.
Examinations after test: Capacitors shall be visually examined for corrosion, leakage of the electrolyte,
deformation of the case, and obliteration of marking.
4.5.11.1 Insulation resistance (insulating sleeves). Capacitor insulating sleeves shall be tested in accordance with
method 302 of MIL-STD-202. The following details and exceptions shall apply:
a. Test condition: B, 500 10 percent volts dc.
b. Points of measurement: Between a strip of metallic foil .5 .06 inch (12.7 mm 1.5 mm)-wide and the
capacitor case. The foil shall be wrapped smoothly for approximately two complete turns around the
capacitor sleeve and shall be held in place by at least two turns of AWG size 20 bare copper wire.
c.
Electrification time: Not more than 1 minute.
4.5.11.2 Dielectric withstanding voltage (insulating sleeves). Capacitor insulating sleeves shall be tested in
accordance with method 301 of MIL-STD-202. The following details and exceptions shall apply:
a.
Magnitude and nature of test voltage: 4,000 volts dc; the test potential shall be increased from 0 to 4,000
volts at a rate of not more than 500 volts per second.
b.
Points of application: Between the strip of metallic foil and the capacitor case (see 4.5.11.1(b)).
c.
Examination after test: The foil wrap shall be removed from insulating sleeves shall be examined for
burning, charring, and arcing.
4.5.12 Impedance (see 3.15). Impedance shall be determined at -40 +0 -3C at a frequency of 120 +10 5 Hz.
The capacitors shall be brought to thermal stability at the test temperature. Thermal stability will have been reached
when no further change in impedance is observed between two successive measurements taken at 15-minute
intervals. Measurement accuracy shall be within 5 percent (see 4.2.2).
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