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

e. Measurement during and after dielectric withstanding voltage: after the test, capacitors shall be visually

examined for external evidence of damage, arcing, or breakdown.

4.7.4.2 For acceptance inspection. Capacitors shall be tested as specified in 4.7.4.1, except that, at the option of

the manufacturer, a test voltage of 250 percent of the rated dc voltage may be applied for a period of not less than 1

second.

4.7.5 Insulation resistance (see 3.9). Capacitors shall be tested in accordance with method 302 of MIL-STD-202.

The following details and exceptions shall apply:

a. Test potential: A potential equal to the rated voltage (see 3.1) or 500 volts dc, whichever is less.

b. Special conditions: Capacitors shall be tested at the applicable high ambient test temperature (see table II),

and at +25�C or corrected thereto.

c. Points of measurement: Between either terminal and the case.

4.7.6 Capacitance (see 3.10). Capacitors shall be tested in accordance with method 305 of MIL-STD-202. The

following details shall apply:

a. Test frequency: 1 kHz �100 Hz for capacitors whose nominal capacitance is 1 �F or less, and 60 �6 Hz for

capacitors whose nominal capacitance is more than 1 �F.

b. Limit of accuracy: Within �2 percent.

4.7.7 Dissipation factor (see 3.11). The dissipation factor of each capacitor shall be measured at a root-mean-

square (rms) voltage not greater than 20 percent of the rated dc voltage. Measurement shall be made at a frequency

of 1 kHz �100 Hz for capacitors whose nominal capacitance is more than 1 �F. Measurement accuracy shall be

within �0.1 percent absolute.

4.7.8 Insertion loss (see 3.12). Capacitors shall be tested in accordance with MIL-STD-220. Measurements shall

be taken at the frequencies specified (see 3.1).

4.7.9 DC resistance (see 3.13). The dc resistance shall be measured directly using a Kelvin bridge or indirectly

using the voltmeter-ammeter method, ammeter-potentiometer method, or other suitable means. The point of contact

shall be along the lead, where the lead is normally connected in an actual circuit, except that for axial-wire leads, the

contact shall be made 5/8 �1/8 inch from the insulator. The maximum allowable measurement error shall be 5

percent.

4.7.10 Resistance to soldering heat (see 3.14).

a. Depth of immersion in molten solder: Within .062 �.031 inch of the seal or case.

b. Test condition: B.

c. Cooling time prior to measurement after test: 1 hour.

d. Measurement after test: capacitance to ground and coil continuity.

4.7.11 Salt atmosphere (corrosion) (see 3.15). Capacitors shall be tested in accordance with method 101

of MIL-STD-202, test condition B. The salt solution concentration shall be 5 percent. After this test, capacitors shall

be visually examined for corrosion and obliteration of marking.