MIL-DTL-55041F
4.7.16 RF power handling capability (see 3.18). The RF power sources shall be capable of furnishing the
specified average and peak power to the input of the switch. The output of the switch shall be terminated into a
matched dummy load. When specified (see 3.1), the RF section shall be pressurized; otherwise, the RF section shall
be vented to atmospheric pressure (30 ± 2 inches mercury) during the test. The power source shall be adjusted to
the lowest specified frequency and the specified average power. Apply this power to the input of the switch for at
least 1 hour. At the end of this time, remove the average power and apply the specified peak power (at the same
frequency) to the input of the switch for at least 5 minutes. Repeat these procedures at the middle frequency and at
the highest specified frequency. The above procedure shall be repeated for each position of the switch. If required to
switch under power and if the switch design includes interlock circuits used to interrupt the RF power source during
switching (see 3.1), the circuits shall be used to do so during this test. During and following the test, the switches
shall be examined for evidence of breakdown, charring, arcing or overheating.
4.7.17 Cycle life (see 3.19). The switch shall be securely mounted on a block weighing not less than 5 times the
weight of the switch; the switch temperature shall be allowed to stabilize at room ambient temperature for not less
than 1 hour before the beginning of the test. Unless specified, RF power need not be applied to the switch. The
switch shall then be operated, at a rate not to exceed one position per second, for the specified number of cycles
(see 3.1). One cycle shall consist of switching from the initial position into each other position and returning to the
initial position. The operating voltage shall be nominal (+10, -0 percent). When indicator or interlock circuits are
included in the design, they shall be energized with the specified current and voltage (see 3.1) during this test. The
contact resistance of these circuits shall be measured at the switch connector terminals before and after this test.
Following this test, switching time, VSWR, insertion loss and isolation shall be measured as specified in 4.7.14,
4.7.18 Thermal shock (see 3.20). The switch shall be tested in accordance with test method 107 of MIL-STD-202.
Unless otherwise specified (see 3.1), test condition B applies. The waveguide ports shall be covered during this test.
4.7.19 Altitude and cold (see 3.21). Switches shall be placed in a pressure chamber maintained at a temperature
of -55°C +0°C, -5°C for 24 hours. After temperature stabilization, the switching time shall be measured as specified
in 4.7.14 (except the temperature shall be maintained at -55°C). The pressure shall then be reduced from standard
barometric pressure to 1.3 inches of mercury (approximately 70,000 feet elevation) and then allowed to stabilize. At
this reduced pressure and during the last 4 hours of the 24 hour holding period, the switches shall be tested for
dielectric withstanding voltage and switching time as specified in 4.7.9 and 4.7.14, respectively (the reduced pressure
and temperature of -55°C shall be maintained). Only one half the voltage specified in 4.7.9 need be applied for the
dielectric withstanding voltage test.
4.7.20 Moisture resistance (see 3.22). The switch, with the waveguide ports sealed, shall be tested in accordance
with test method 106 of MIL-STD-202 except that steps 7a and 7b may be omitted. The following details apply:
a.
Initial measurements: Not applicable.
b.
Polarization voltage: Not applicable.
c.
Loading voltage: Not applicable.
4.7.21 Pressure (see 3.23). With the switch at room ambient temperature, the RF portion shall be capped and
then pressurized at the pressure specified (see 3.1). The applied pressure shall be measured at the switch, not at
the pressure source. The switch shall then be submerged for one minute in fresh tap water that is at 25 ± 5°C.
Repeat the test with the switch at the lower temperature extreme.
4.7.22 Vibration (see 3.24). The switch shall be tested in accordance with method 201 of MIL-STD-202 except
that the motion shall be applied for a period of 10 minutes in each of the 3 mutually perpendicular directions (a total of
30 minutes). The switch shall be firmly secured to the vibration platform without the use of shock isolators. Unless
otherwise specified, the switch need not be energized for this test.
4.7.23 Shock (specified pulse) (see 3.25). The switch shall be securely mounted, without isolators, and subjected
to the shock test in accordance with condition K of method 213, MIL-STD-202.
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