MIL-STD-981C
5.6.7.3.6.1 Thermal shock. Thermal shock screening shall be in accordance with MIL-PRF-15305, and as follows: (Note: End point measurements per MIL-PRF-15305 shall not apply).
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.
5.6.7.3.6.2 No load burn-in. Devices shall be tested as follows:
a. Test duration: 96 hours minimum
b. Test temperature: Maximum rated operating temperature. (See applicable specification)
c. Test voltage: Not applicable
5.6.7.3.7 Low power pulse transformers (family 31). These devices shall be subjected to the group A
screening tests in TABLE VIII.
TABLE VIII. Group A screening tests for family 31 (see 5.6.7.3.7).
Examination/Test |
Class |
Applicable Military Specification |
Inspection |
|
S |
B |
|||
Subgroup I Thermal shock Temperature rise 1/ No-load Burn-in Dielectric withstanding voltage Insulation resistance Inductance Q 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 2/ |
See 5.6.7.3.6.1 MIL-PRF-21038 See 5.6.7.3.6.2 MIL-PRF-21038 MIL-PRF-21038 MIL-PRF-21038 MIL-PRF-21038 MIL-PRF-21038 MIL-PRF-21038 See appendix B |
100 percent |
Subgroup II Visual and dimensional examination (external) |
x |
x |
MIL-PRF-21038 |
100 percent |
1/ Test 2 units for temperature rise per applicable specification if temperature rise is not known.
2/ When specified.
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