MIL-PRF-83421E
f. Measurements after life test: Capacitors shall be returned to the inspection conditions specified in 4.3. The
insulating sleeves shall be removed and the insulation resistance, capacitance, and dissipation factor shall be
After the test, capacitors shall be visually inspected for evidence of corrosion, leakage of impregnant, and mechanical
damage.
4.7.24.2 Conformance inspection.
4.7.24.2.1 Accelerated condition. Capacitors shall be tested as specified in 4.7.24.1, except at the accelerated
condition only, measurements shall be accomplished after 1,000 hours +48 hours, -0 hours; and 2,000 hours +72
hours, -0 hours.
4.7.24.2.2 Rated condition. Upon completion of the 2,000-hour test and related inspections, those capacitors
which were tested under the rated condition shall be tested for an additional 8,000 hours; measurements shall be
accomplished after 2,000 hours +72 hours, -0 hours; and every 2,000 hours +72 hours, -0 hours thereafter, until
10,000 hours +96 hours, -0 hours have elapsed.
4.7.25 AC conditioning (when specified, see 3.1 and 3.29). Capacitors shall be exposed to the voltages and
frequencies specified at +100°C for 240 hours +48 hours, -0 hours.
4.7.26 Flash point of impregnant (see 3.30). The flash point of impregnant shall be measured as specified in
ASTM-D92, except that fire point and precision do not apply. The word "impregnant" shall be substituted for the word
"oil" throughout the test method.
5. PACKAGING.
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Capacitors covered by this specification are primarily intended for use in power supply filter
circuits, by-pass applications, and other applications where the ac component of voltage is known or a significant
factor. Styles covered by this specification may be used for applications requiring a tight capacitance tolerance,
excellent capacitance stability, very high-insulation resistance, and low-loss factors where the ac component of
voltage is large with respect to the applied dc voltage. These devices also must be able to operate satisfactorily in
high reliability military systems under demanding conditions such as 50 Gs of high frequency vibration and 100 Gs of
shock (specified pulse). Commercial components are not designed to withstand these military environmental
conditions. These capacitors can exhibit momentary breakdowns. If sufficient energy is available from the circuit and
stored in the capacitor, clearing will occur. Minimum stored energy in the range 100 to 500 microjoules is
recommended to insure clearing. Applications for these capacitors should be limited to circuits that will provide
sufficient energy to insure clearing and are insensitive to momentary breakdown/clearing actions.
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