MIL-PRF-55365H
4.7.2 Radiographic inspection (T level only) (see 3.5). Capacitors shall be tested in accordance with method
209 of MIL-STD-202. 100 percent X-ray required with one side view of the cathode attachment.
4.7.3 Destructive physical analysis (T level only) (see 3.6). Parts shall be examined in accordance with
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MIL-STD-1580 with the following exceptions:
1) The DPA will be performed by the manufacturer of the part unless otherwise requested by the procuring
agency.
2) The manufacturer will retain the DPA residues/samples for a period of 10 years and will supply a DPA
summary report to the customer.
3) The DPA summary report will reflect MIL-PRF-55365 criteria (see 3.6) and will not match the example reports
in MIL-STD-1580. Examine using 30X magnification.
4.7.4 Visual and mechanical inspection. Capacitors shall be examined to verify that the materials, design,
construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements
4.7.5 Voltage aging (exponential only) (see 3.8). Capacitors shall be subjected to a minimum of 100 percent of dc
rated voltage for 40 hours, minimum, at a temperature of +85°C ±5°C. The voltage aging circuit shall have a series
resistance of 3.0 ohms, maximum. Capacitors shall then be stabilized at room temperature and the dc leakage,
capacitance, dissipation factor, and ESR (when specified, see 3.1) shall then be measured as specified in 4.7.6,
4.7.6 DC leakage (see 3.9). DC leakage shall be measured using the applicable voltage (see Table I) 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 microampere (µA), whichever is greater (see 4.3.3).
If while taking a DC leakage measurement the limit as specified in the individual slash sheet is exceeded, an
automatic verification re-read is allowed and should be taken as the official measurement. This reading should be
taken immediately following the first reading after a shorting of the capacitor and re-electrification of the part for the
time required by the specification. Both readings must be reported on the test report.
If this second reading still shows the unit exceeding the limit allowed by the specification, the part is considered a
failure. If this second reading shows the part as being within the allowed limit the part is considered as a non-failure
and the part will be continued on test.
"T" level only: Following Weibull grading as specified in group A and after measuring the DC leakage, a mean and
standard deviation shall be calculated for the lot from those that pass the dc leakage test. Those capacitors not
passing +3 standard deviations shall be removed and not delivered to an order.
4.7.7 Capacitance (see 3.10) 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.
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