MIL-PRF-87217 Capacitors, Fixed, Supermetallized Plastic Film Dielectric, Direct Current For Low Energy, High Impedance Applications, Hermetically Sealed In Metal Cases, High Reliability, General Specification ForThis specification covers the general requirements for high reliability, supermetallized plastic film dielectric, fixed capacitors, hermetically sealed in metal cases. Capacitors covered by this specification have a failure rate \(FR\) level established in accordance with MIL-STD-690. This FR level is established at a 90-percent confidence level and maintaned at a 10-percent producer\'s risk and, unless otherwise specified \(see 3.1\), is based on MIL-PRF-83421 life tests performed at maximum rated voltage at maximum rated temperature.

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MIL-PRF-87217A

4.7.6 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: 1,000 100 hertz (Hz).

b. Limit of accuracy:

0.05 percent.

4.7.7 Dissipation factor (see 3.11). The dissipation factor shall be measured at 1,000 100 Hz (for capacitors

having a nominal capacitance of 1 microfarad or less) or 100 10 Hz (for capacitors having a nominal capacitance

greater than 1 microfarad).

4.7.8 Seal (see 3.12). Capacitors shall be tested in accordance with method 112 of MIL-STD-202. The following

details shall apply:

a. Test condition letters: As specified (see 3.1).

b. Measurements after test: Not applicable.

4.7.8.1 Alternate test for liquid-impregnated capacitors only. Capacitors shall be placed with the terminals facing

sideways (not upward) on a clean sheet of absorbent paper and exposed to a case temperature within +3 C, -0 C of

the applicable maximum rated temperature (see 3.1) for a period of 4 hours minimum. After the test, capacitors and

absorbent paper shall be visually inspected for evidence of leakage of impregnant.

4.7.9 Radiographic inspection (see 3.13). The capacitors shall be radiographed in accordance with the appendix.

The following details shall apply:

a. Number of views: See appendix, figure 3. Axial lead style capacitors: Two views perpendicular to the

plane of the leads, with the second view made after rotation of the capacitors 90 around its own axis.

b. Inspection of films: The films shall be inspected on a back-lighted illuminator using a minimum of 10X

magnification.

c. Defects: Capacitors containing any defects as specified in 3.13 and appendix, figure 2 shall be rejected.

d. Summary data of inspection results: A summary of the results of radiographic inspection (number of parts

inspected, number accepted, number rejected) shall be included on the report of group A inspection

furnished with each shipment of capacitors.

e. Retention of films: Radiograph films and test reports shall be retained by the manufacturer for a minimum

period of 12 years.

4.7.10 High impedance dc life (see 3.14). The capacitors shall be tested 250 hours at 100 C with 1.5 0.5 volts

dc and 1 through 10 megohms resistor in series with each capacitor so that the energy from source or across the

capacitor is 500 microjoules, maximum.

a. Insulation resistance: Terminal to terminal: Shall meet the initial requirements (see 3.1).

b. Capacitance: Shall meet the initial requirements (see 3.1).

c. Dissipation factor: Shall meet the initial requirements (see 3.1).

4.7.11 Solderability (see 3.15). Capacitors shall be tested in accordance with method 208 of MIL-STD-202. The

following details shall apply:

a. Number of terminations to be tested: Both leads of the capacitor shall be subjected to the solderability test.