MIL-DTL-87104C
4.6.4.9.3 Accept-reject criteria. The assembly shall be considered to have passed the heat aging and cold bend
test if:
a.
There is no evidence or signs of cracks or flaws in the cable.
b.
4.6.4.10 Flow test (see 3.5.3.12). The flow test shall determine the ability of the coaxial cable to maintain its
coaxial characteristics when exposed to extreme environmental conditions.
4.6.4.10.1 Test setup.
4.6.4.10.1.1 Test equipment. A temperature chamber and related equipment, and an X-ray photographing
apparatus and related equipment, or approved equivalent apparatus, shall be required.
4.6.4.10.1.2 Test conditions. The test conditions shall be as specified herein.
4.6.4.10.2 Procedure.
a.
The coaxial cable shall be squarely and cleanly cut to allow access to the inner conductor for the purpose
of attaching weights.
b.
The test sample shall be draped symetrically with the weights hanging freely, over a horizontal test
mandrel, whose diameter is 10 times the outside diameter of the cable, and placed in an oven maintained
at 95°C ± 2°C for 7.5 hours.
c.
The weights shall then be removed and the cable, preferably supported by the mandrel, shall be removed
from the oven and allowed to cool to room temperature (see 4.3.1.1).
d.
The test sample shall not be straightened.
e.
The dielectric shall be X-ray photographed, or examined by an approved equivalent method, which will not
result in physical distortion of the test sample.
4.6.4.10.3 Accept-reject criteria (see 3.5.3.12). If the inner conductor is displaced from the center of the cable by
more than 10 percent of the diameter of the dielectric measured along the direction of flow, the cable shall be
considered as having failed the flow test.
4.6.4.11 Abrasion resistance test (see 3.5.3.13). The abrasion resistance test shall determine the abrasion
resistance of the assembly.
4.6.4.11.1 Test setup.
4.6.4.11.1.1 Test equipment. A squirrel cage abrasion tester and related apparatus shall be required as specified
in figure 2 of SAE-AS5756. The abrasion test apparatus shall be checked for its finish and unbroken and unrounded
edges prior to each test. The finish shall be recorded. The radius of any portion of the abrasion bars shall not
exceed .002 inch (0.05 mm).
4.6.4.11.1.2 Test conditions. Tests shall be conducted under room ambient conditions (see 4.3.1.1) and as
specified herein.
4.6.4.11.2 Procedure.
4.6.4.11.2.1 Flexible coaxial assembly. The test sample shall be mounted securely at one end and a three-pound
weight freely suspended to the other end with the cable placed over the squirrel cage abrasion tester. A suitable
tripping circuit shall be arranged to denote failure by stopping the machine when any bar of the squirrel cage comes
in contact with the bare conductor of the cable. The test sample shall be subjected to 20 ± 2 oscillations per minute
(an oscillation shall consist of 5 bars travel forward and backward from a given point.)
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