MIL-PRF-24623C
transmittance shall be measured during and after the test (see 4.7.3.2). Change in
optical transmittance measurements shall be made after the 10th, 25th, and 50th cycle.
At the completion of the test, the splice shall be visually examined in accordance
with 4.7.2.
4.7.2.7 Axial compressive loading (for cable splice only). Axial compressive
loading shall be tested as specified herein. If the two ends of the splice assembly
are essentially identical, only one end of each splice assembly need be tested (see
3.5.7).
a. The test cable forming a part of the assembled splice shall be gripped over a
length equal to at least three cable diameters, starting one cable diameter
from the splice enclosure or the strain relief if it is external to the
enclosure. The splice enclosure shall be gripped so as not to alter any of its
mechanical properties.
The gripped cable and splice enclosure shall be forced together along the
b.
direction of the cable axis where the cable enters the splice assembly. The
force magnitude is a function of the cable diameter as listed in table VI.
Loading and unloading rates are such that the splice is compressively loaded
and unloaded linearly in time, with the loading and unloading times each less
than 10 seconds. The time spent under full compressive load shall be at least
1 minute. No tensile load shall be applied.
c. Any suitable test fixture may be used provided it properly grips the splice
enclosure and cable, allows control and measurement of the applied compressive
axial force, and allows visual observation of the region where the cable meets
the splice assembly. The test fixture must also allow for the performance of
any optical tests called for while the splice assembly is subject to the
compressive axial load.
d. With load applied, measure the distance between the fixture clamp and the
enclosure or strain relief and measure the insertion loss.
e. Remove the load.
f. Visual observations and examinations shall be made with 3X magnification.
Force magnitude.
TABLE VI.
Nominal cable diameter (millimeters)
Compressive axial force (newtons)
10
0 to 2.9
20
3 to 5.9
50
6 to 9.9
100
10 to 19.9
200
20 and larger
4.7.2.8 Crush. Cable splices shall be tested in accordance with TIA/EIA-455-26,
with the exception that the test sample shall be a splice (see 3.5.8). The test load
shall be 1250 newtons, and the number of loads shall be one. Rubber pads shall not be
used on the two bearing surfaces. The change in optical transmittance shall be
measured during and after the test (see 4.7.3.2). At the completion of the test, the
splice shall be visually examined in accordance with 4.7.2.
4.7.2.9 Impact, cable splice. Cable splices shall be tested in accordance with
method A of EIA/TIA-455-2, moderate service class (see 3.5.9).
4.7.2.9.1 Impact, fiber splice. Fiber splices shall be tested in accordance with
method C of TIA/EIA-455-2. The change in optical transmittance shall be monitored
after the test in accordance with 4.7.3.2 (see 3.5.9).
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