MIL-DTL-13777K
4.8.2.5.1.3 Water absorption test. Samples shall be removed from the finished cable and shall be thoroughly
cleaned by scrubbing with water and a small brush or lintless cloth. The specimens shall be rinsed and dried
by exposure to circulating air at a temperature of 120º±3ºF for a period of 24 hours. Test specimens of the
insulated conductor shall be made up into a coil with an inside diameter of not less than 2 inches (50.80 mm).
The specimens shall be supported by fitting the ends snugly through the cover of a vessel containing tap water.
The specimens shall be of such length and so supported that not less than 5 feet of conductor is exposed
below the plate and that the ends do not project more than 6 inches (152.40 mm) above the plate. The
insulation shall be removed from the ends of a distance of 0.5 inch (12.70 mm). The water shall be maintained
at a temperature 120º±3ºF. The conductors shall fit tightly to the cover, and the cover shall fit tightly to the
vessel to prevent excessive evaporation. The level of the water shall be maintained flush with the side of the
cover. The length of the conductor below the under side of the cover shall be taken as the length immersed. If
the vessel is made of metal it shall be considered the electrical ground. If it is not of metal, a ground plate of
suitable area shall be immersed in the water. All metal parts other than the conductor under tests shall be
grounded. The capacitance shall be measured between the conductor and the ground, at 1000Hz, with a
suitable alternating current bridge, with an accuracy of 1 pF of capacity and 0.001 power factor. All
measurements shall be made at a temperature of 120º±3ºF without disturbing the test specimen in any manner.
The capacitance shall be recorded in microfarads per 1000 feet of conductor immersed. The first measurement
shall be made after 24 hours immersion at 120ºF and shall be considered the original capacity. Subsequent
measurements shall be made 7 days after the original measurements (see 3.5.3.3).
4.8.2.5.2 Capacitance. Capacitance tests shall be made, on coaxial conductors, in accordance with
4.8.2.5.3 Attenuation. Attenuation shall be measured, on coaxial conductors, in accordance with MIL-DTL-17.
4.8.2.5.4 Impedance. The characteristic impedance shall be determined on coaxial conductors with
4.8.3 Sheath. In order to determine the compliance of the sheath compound with the requirements of 3.7 the
following test shall be made.
4.8.3.1 Physical tests.
4.8.3.1.1 Tension set. Except for the following, the maximum tension set shall be determined in accordance
with method 4411 of FED-STD-601. The minimum set shall be determined by elongating specimens until the 2
inch (50.80 mm) gage marks are 6 inches (152.40 mm) apart, releasing within 5 seconds and determining the
distance between gage marks 1 minute after release. The set is the difference between this length and the
original 2 inches (50.80 mm) gage length.
4.8.3.1.2 Ultimate elongation. Ultimate elongation tests shall be made in accordance with method 3031 of
4.8.3.1.3 Tensile strength. Tensile strength tests shall be making in accordance with method 3021 of
4.8.3.1.4 Tear strength. Tear strength tests shall be made in accordance with method 3111 of FED-STD-228.
4.8.3.1.5 Accelerated aging tests. The accelerated aging tests shall be made in accordance with method 4011
of FED-STD-228.
4.8.3.1.6 Oil resistance tests. Oil resistance tests shall be made in accordance with method 4221 of
4.8.4 Finished cable tests.
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