MIL-DTL-87104C
4.6.2.9.2 Procedural steps. The thermal stability test shall be conducted in accordance with the following steps:
Step 1: When applicable, subject the test samples to VSWR, procedure II (see 4.6.2.1.2); RF insertion
a.
loss, procedure I (see 4.6.2.3.2); and altitude compliance (see 4.6.2.5).
b.
Step 2: Unless otherwise specified in the detail specification, measure the phase angle of samples.
Step 3: Place the test samples, coiled or straight, in a preheated oven at 150°C ± 2°C for one hour.
c.
d.
Step 4: After this exposure, remove the test samples and place them directly into a pre-chilled cold
chamber for one hour at -50°C ± 2°C.
e.
Step 5: Repeat steps 3 and 4, two times.
f.
Step 6: Repeat step 3.
g.
Step 7: Repeat step 2 while the test sample is still in the chamber.
h.
Step 8: Remove the test samples from the chamber and repeat step 1.
i.
Step 9: Unless otherwise specified in the applicable detail specification, measure each end of the
applicable test sample for inner conductor positioning relative to all other elements of the cable sample
(see 3.5.1.11).
j.
Step 10: Repeat steps 3 and 4, three times.
k.
Step 11: Repeat steps 7, 8, and 9.
l.
Step 12: Repeat steps 5 through 11, seven times.
4.6.2.9.3 Accept-reject criteria (see 3.5.1.11). The coaxial assembly shall be considered to have passed the
thermal stability test if:
a.
Cable sample. The cable measurements in step 9 shall not exceed the specification value.
b.
Assembly samples. After every completion of step 1, the assembly shall pass the accept-reject criteria of
4.6.2.1.2.5, 4.6.2.3.2.1, 4.6.2.5.3. After every completion of step 2, the assembly shall meet the phase
angle requirements.
4.6.3 Mechanical tests. The equipment shall be subjected to the mechanical tests specified herein to determine
compliance with mechanical requirements of this document. When the test are performed in a sequence, it shall not
be required to duplicate VSWR and examination of product tests at the beginning of a mechanical test if the identical
VSWR and examination of product was conducted at the end of the preceding test and less than 24 hours have
elapsed.
4.6.3.1 Interface-gauging tests (see 3.5.2.1). Gauging of the primary interfaces of the coaxial assembly shall be
performed to determine compliance of the interface dimensions with the applicable detail specification.
4.6.3.1.1 Test setup.
4.6.3.1.1.1 Test apparatus. A series of gauge pins or ring gauges, as applicable, as defined in the applicable
detail specification, shall be required.
4.6.3.1.1.2 Test conditions. Unless otherwise specified in the detail specification, all gauge tests shall be
conducted under room ambient conditions (see 4.3.1.1).
4.6.3.1.2 Procedure. The gauge tests shall be conducted as specified in the applicable detail specification.
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