MIL-STD-981 Design, Manufacturing And Quality Standards For Custom Electromagnetic Devices For Space Applications

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MIL-STD-981C

5.6.7.3.9 Radio frequency fixed coils (family 52). These devices shall be subjected to the group A

screening tests, in TABLE x.

TABLE x. Group A screening tests for family 52 (See 5.6.7.3.9)

Examination/Test

Class

Applicable Military

Specification

Inspection

Subgroup I Thermal shock

Temperature rise 1/

No-load Burn-in

Dielectric withstanding voltage Insulation resistance Inductance

Self resonant frequency DC resistance Radiographic inspection

x x x x x x x x x x

x x x x x x x x x

See 5.6.7.3.9.1

MIL-PRF-39010

See 5.6.7.3.9.2

MIL-PRF-39010

See appendix B

100 percent

Subgroup II Visual and dimensional

examination

MIL-PRF-39010

100 percent

1/ Test 2 units for temperature rise per applicable specification if temperature rise in not known.

2/ When specified.

5.6.7.3.9.1 Thermal shock. Thermal shock screening shall be in accordance with MIL-PRF-39010, and as follows:

a. Number of cycles: 25

b. Continually monitor continuity during the entire final cycle to verify no intermittent conditions.

Continuity monitoring current shall not exceed 100 microamperes. Equipment shall be capable of detecting intermittent opens exceeding 100 microseconds.

c. Class S parts using magnet wire smaller than AWG 38 shall have DC resistance measured before and after the thermal shock screen. The change in resistance shall not exceed ±3 percent.

5.6.7.3.9.2 No-load burn-in.

a. Test duration: 96 hours minimum.

b. Test temperature: Maximum rated operating temperature. (See applicable specification)

c. Test voltage: Not applicable.