MIL-PRF-11693 Capacitors, Feed Through, Radio-Interference Reduction, Dc \(Hermetically Sealed In Metal Cases\), Established And Non-Established Reliability General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-ER capacitors designed for operation with direct current \(dc\), paper, paper plastic, and plastic \(extended foil\) dielectric, radio-interference-reduction, feed-through capacitors, hermetically sealed in metal cases \(see 6.6.2\), for use primarily in broadband, radio-interference suppression application. Capacitors meeting the established reliability requirements specified herein have a maximum failure rate of 1.0 percent per 1,000 hours. This failure rate is established with a 90-percent confidence limit based on the life test parameters specified and are maintained at a 10-percent producer?╞s risk. An acceleration factor of 5:1 has been used to relate the life test data obtained at 140 percent of rated dc voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature.

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MIL-PRF-11693E

4.7.12 Thermal shock and immersion (see 3.16).

4.7.12.1 Thermal shock. Capacitors shall be tested in accordance with method 107 of MIL-STD-202. The

following details shall apply:

a. Test condition letter: A, except that in step 3, capacitors shall be tested at the applicable high ambient test

temperature (see table II).

b. Measurements before and after cycling: Not applicable.

4.7.12.2 Immersion. Within 4 to 24 hours after completion of thermal shock, capacitors shall be tested in

accordance with method 104 of MIL-STD-202. The following details shall apply:

a. Test condition letter: B.

b. Measurements after final cycle: Dielectric withstanding voltage, insulation resistance at +25�C, capacitance,

dissipation factor, and insertion loss shall be measured as specified in 4.7.4, 4.7.5, 4.7.6, 4.7.7 and 4.7.8,

respectively. These measurements shall be made within 2 hours after capacitors are removed from the

immersion tank, except that no time limit is specified for the insertion-loss measurement. If the capacitors fail

the insulation-resistance test, they may be retested for insulation resistance after a total maximum drying

period of 24 hours.

c. Visual examination: Capacitors shall be examined for corrosion and obliteration of marking.

4.7.13 Shock (specified pulse) (see 3.17). Capacitors shall be tested in accordance with method 213 of MIL-STD-

202. The following details shall apply:

a. Mounting: securely fastened by normal mounting means. When applicable, leads and connecting wires must

be supported to prevent damage to the capacitor.

b. Test condition: Non ER: G (50g, peak);

ER:

I (100g, peak).

c. Electrical loading during shock: During the test, a potential of 125 percent of dc rated voltage (see 3.1) shall

be applied to the capacitor.

d. Measurements 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 duration or greater.

e. Examination after test: Capacitors shall be visually examined for evidence of mechanical damage.

4.7.14 Vibration, high frequency (ER only) (see 3.18). Capacitors shall be tested in accordance with method 204

of MIL-STD-202. The following details shall apply:

a. Mounting: securely fastened by normal mounting means. When applicable, leads and connecting wires must

be so supported to exclude spurious resonance.

b. Electrical load conditions: during the test, a potential of 125 percent of rated voltage (see 3.1) shall be

applied between the terminal and case of the capacitor.

c. Test condition letter: B (15g).

d. Direction and duration of motion: 4 hours in each of two mutually perpendicular directions (total of 8 hours),

one parallel and the other perpendicular to the cylindrical axis.