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Capacitors manufactured to the Military performance specifications can be purchased to Established Reliability (ER) levels, identified by a product level designator as shown in Table 1. The statistical confidence levels are established at a 60% with a 10% consumer risk factor. The failure rate and statistical confidence level of capacitors purchased to commercial standards will vary. Quality assurance requirements are dependent on the quality level of the capacitor. Capacitors conforming to the ER requirements of Military performance specifications are required to undergo Group A, B, and C testing on a periodic basis. Conformance tests for the MIL-PRF capacitor standards are given in Table 2 for Group A Inspection test requirements.

Table 1. Failure Rate Designators
for Military Capacitor Styles

 

Table 2. Sample of A Group Inspection-Test Requirements for Capacitors

Table 3shows the conformance tests for Group B tests, and Table 4shows the conformance tests for Group C. As the tables show, tests are not the same across all capacitor styles, and some capacitor specifications no longer contain Group B or C tests.

Table 3. Sample of Group B Inspection-Test Requirements for Capacitors

 

Table 4. Sample of Group C Inspection-Test Requirements for Capacitors