MIL-DTL-87104C
4.6.3.4.1.1 Test equipment. A flexing endurance test fixture shall be required that is capable of flexing a 30-inch
(762 mm) section of the cable assembly through ± 75° (over-all travel of 150°) at a continuous rate of approximately
40 cycles per minute.
4.6.3.4.1.2 Test conditions. Tests shall be conducted under room ambient conditions (see 4.3.1.1) and as
specified herein.
4.6.3.4.2 Procedure.
a. The cable assembly shall be subjected to the examination of product, procedure II (see 4.6.1.2), and the
VSWR test, procedure II (see 4.6.2.1.2).
The cable assembly shall be subjected to repeated flexures of ± 30 degrees per foot for 400 cycles at
b.
15 cycles per minute and ± 10 degrees per foot for 100,000 cycles at 40 cycles per minute.
c.
The cable assembly shall be subjected to examination of product, procedure II and the VSWR test,
procedure II.
4.6.3.4.3 Accept-reject criteria (see 3.5.2.4). If the cable assembly passes the accept-reject criteria established by
4.6.1.2.2 and 4.6.2.1.2.5, the cable assembly shall be considered to have passed the test.
4.6.4 Environmental tests. The equipment shall be subjected to the environmental tests specified herein to
determine compliance with the environmental requirements of this document. When tests are performed in a
sequence, it shall not be required to duplicate VSWR and examination of product tests at the beginning of an
environmental 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.
4.6.4.1 Temperature-altitude test (see 3.5.3.3). The temperature-altitude test shall determine satisfactory
operation of the equipment under the temperature-altitude conditions specified herein.
4.6.4.1.1 Test setup.
4.6.4.1.1.1 Test equipment. A temperature-altitude chamber, RF power source, high power terminations, and
associated instrumentation shall be required.
4.6.4.1.1.2 Test conditions.
a. The test sample shall be placed in the test chamber in a manner simulating installed conditions, making
such connections and instrumentation as necessary. The sample being tested shall not occupy more than
50 percent of the chamber volume.
b.
Temperature sensing devices (see 4.3.2) shall be used to measure chamber and test sample conditions,
and chamber and test sample conditions shall be stabilized (see 4.3.1.3) prior to each step in the test
program.
c.
Unless otherwise specified, the test shall be conducted in accordance with test condition A for a specified
altitude of 70,000 feet, test condition B for a specified altitude of 60,000 feet, or test condition C for a
specified altitude of 50,000 feet (see table V).
d.
When changing chamber conditions from those of one step to those required for any other step in the
sequence given in table V, the rate of temperature and pressure changes shall not exceed 1°C per second
and 0.5 inch of mercury per second. The minimum VSWR of the load shall be 1.75:1.
e.
The assembly shall be energized at full rated power (see 3.5.1.8) at three frequencies: The lower
frequency shall be within 0.10 GHz of the low end of the frequency band; the second frequency shall be
within 10 percent of the center of the band; and the third frequency shall be within 10 percent of the high
end of the frequency band. Full rated power shall be applied to the assembly for a minimum of 10 minutes
for each frequency tested.
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