MIL-PRF-28750F
4.7.2.7 Burn-in test (see 3.8.7) (continued).Test conditions shall be measured on one randomly selected socket
prior to start of the test. The values, the test temperature, and start time shall be recorded on a burn-in log. At the
completion of the test prior to removal of bias, the test conditions shall be measured on one randomly selected
socket. The values, the temperature, and the finish time shall be recorded on the burn-in log.
Any SSR's that fail during the burn-in shall be removed from the lot at the completion of burn-in. If the test conditions
are interrupted for more than 10 minutes during the test (for example, due to equipment malfunction or power
outages), the test duration shall be extended to ensure that actual exposure time is 160 +8 hours/-0 hours. Any such
interruptions in the final eight hours of test shall require an extension of the test duration for eight hours following the
last interruption.
4.7.3 Solderability (applicable to solder terminals) (see 3.9). SSR's shall be tested in accordance with method 208
of MIL-STD-202. All terminations of each SSR shall be tested.
4.7.4 Seal (see 3.10). SSR's shall be tested in accordance with 4.7.4.1 as applicable. In case of dispute,
MIL-STD-883, method 1014, test condition A shall govern.
4.7.4.1 Relays sealed with or without a tracer gas. Relays shall be tested for fine leak and gross leak using one of
the fine leak procedures and one of the gross leak procedures in the following table. Fine leak shall be performed
prior to gross leak, unless MIL-STD-883 (method 1014) Test Condition B2/B1 is used. The standard leak rate (L value
Fine Leak
MIL-STD-883 (method 1014) Test Condition B1
MIL-STD-883 (method 1014) Test Condition A2
Gross Leak
MIL-STD-883 (method 1014) Test Condition B2
MIL-STD-202 (method 112) Test Condition D
MIL-STD-883 (method 1014) Test Condition C
Fine Leak and Gross Leak Combination
MIL-STD-883 (method 1014) Test Condition B2/B1
When using the radioisotope tests, it is recommended practice to use B2 first to remove gross leakers prior to the fine leak
test B1, which minimizes the Kr85 entrapped in rejected devices.
4.7.4.2 Radioisotope dry gross leak test (optional). This test shall be used only to test SSR's that internally contain
some krypton-85 absorbing medium, such as electrical insulation, organic sieve material, or molecular sieve material.
This test shall be permitted only if the following requirements are met:
a.
A 5 to 10 mil diameter hole shall be made in a representative unit of the SSR to be tested. (This is a one
time test that remains in effect until a design change is made in the SSR internal technology.)
b.
The SSR shall be subjected to this test condition. If the SSR exhibits a hard failure, this test condition may
be used for those SSR's represented by the test unit. If the SSR does not fail, this test shall not be used
and instead a +125C fluorocarbon gross leak shall be performed in accordance with MIL-STD-202, method
112, test condition D, except the specimen shall be observed from the instant of immersion for 1 minute
minimum to 3 minutes maximum.
19
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business