MIL-PRF-49137E
4.8.3 Construction analysis (metal cased units only) (see 3.6). Six pieces from each inspection lot shall be
dissected in such a way that the plastic end-fill can be inspected to determine the extent of the filling.
4.8.4 DC leakage (see 3.7). DC leakage shall be measured using the dc rated voltage ±2 percent at the
applicable test temperature (see 3.1), after a maximum electrification period of 5 minutes. A 1,000 ohm resistor shall
be placed in series with the capacitor to limit the charging current. A steady source of power, such as a regulated
power supply, shall be used. Unless otherwise specified (see 3.1), measurement accuracy shall be within ±2
percent or 0.02 microamp (µA), whichever is greater (see 4.3.4).
4.8.5 Capacitance (see 3.8). Capacitors shall be tested in accordance with method 305 of MIL-STD-202. Unless
otherwise specified (see 3.1), the following details shall apply.
a. Test frequency: 120 Hz ±5 Hz.
b. Limit of accuracy: Measurement accuracy shall be within ±2 percent of the reading.
c. Magnitude of polarizing voltage: Maximum dc bias shall be 2.2 volts for all ac measurements. The magnitude
of the ac voltage shall be limited to 1.0 volt rms.
4.8.6 Dissipation factor (see 3.9). The dissipation factor shall be measured by means of a polarized capacitance
bridge. The bridge shall provide a dial reading accuracy of 0.1 percent dissipation factor and measuring accuracy of
± (2 percent of the measured dissipation factor plus 0.1 percent). Unless otherwise specified (see 3.1), the test
frequency and the magnitude of the polarizing voltage shall be as specified in 4.8.5.
4.8.7 Shock (specified pulse) (see 3.10). Capacitors shall be tested in accordance with method 213 of MIL-STD-
202. The following details and exceptions shall apply:
a. Special mounting means: Capacitors shall be rigidly mounted on a mounting fixture by the body. Potting
compounds may be used to secure the capacitor body as long as the compound does not support the leads.
Leads shall be secured to rigidly supported terminals, spaced so that the length of each lead from the
capacitor is approximately .375 inch (9.53 mm) when measured from the edge of the supporting terminal.
Leads shall be within 30 degrees of being parallel. When securing leads, care shall be taken to avoid
pinching the leads.
b. Test condition letter I (100 g's peak).
c. Measurements and electrical loading during shock: During the test, observations shall be made to determine
intermittent contact or arcing or open-circuiting or short-circuiting. Detecting equipment shall be sufficiently
sensitive to detect any interruption with a duration of 0.5 ms. The dc rated voltage (see 3.1) shall be applied
to the capacitors during the test.
d. Examinations after test: Capacitors shall be visually examined for evidence of arcing, breakdown, and
mechanical damage.
4.8.8 Vibration, high frequency (see 3.11). Capacitors shall be tested in accordance with method 204 of MIL-STD-
202. The following details and exceptions shall apply:
a. Mounting of specimens: Capacitors shall be mounted on a fixture by the body. Leads shall be supported by
rigidly supported terminals.
b. Electrical load conditions: During the test, the specified dc rated voltage (see 3.1) shall be applied to the
capacitors.
c. Test condition letter D (20 g's).
d. Duration and direction of motion: Four hours in each of two mutually perpendicular directions (total of 8
hours), one parallel and the other perpendicular to the axis.
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