MIL-DTL-55041F
TABLE V. Group B inspection.
Test
Inspection
Requirement
method
paragraph
paragraph
Cycle life - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Post electrical tests - - - - - - - - - - - - - - - - - - - - - -
4.7 Methods of inspections and tests.
4.7.1 Visual and mechanical inspection. Waveguide switches shall be inspected to verify that the materials,
design, construction, physical dimensions, finish, marking and workmanship are in accordance with applicable
4.7.2.1 Thermal shock. Switches shall be tested as specified in 4.7.18, except the run-in test of 4.7.3 shall be
performed after the thermal shock rather than the electrical post tests.
4.7.2.2 Run-in. Switches shall be tested as specified in 4.7.3.
4.7.2.3 Visual and mechanical inspection. Switches shall be inspected as specified in 4.7.1.
4.7.3 Run-in (see 3.5). Using the test set-up of figure 1, the switch shall be operated at a rate not to exceed one
position per second for 4,800 cycles. One cycle shall consist of switching from the initial position into each other
position and returning to the initial position. Switches with externally accessible contacts (such as indicating or
interlock circuit contacts) shall have the contact resistance of these contacts measured and recorded both before and
after run-in. Any increase in contact resistance greater than 10 percent shall be cause for rejecting these switches.
4.7.4 Pull-in voltage (see 3.6). With the switch at room ambient temperature, connect a voltmeter directly across
the input terminals of the selected position. Slowly increase actuator voltage and note the actual voltage at which the
actual switching action occurs. Repeat this test for each position requiring the application of actuator power. Repeat
the above procedure with the switch at the lowest and at the highest specified temperatures (see 3.1).
4.7.5 Dropout voltage (see 3.7) (fail-safe type). With the switch at room ambient temperature, connect a voltmeter
across the terminals of the selected switch position and apply nominal operating voltage (see 3.1). Gradually reduce
the actuator voltage until the switch returns to the deenergized position. The above test shall be repeated for each
switch position requiring actuator power.
4.7.6 Operating current (see 3.8). With the switch at room ambient temperature, apply nominal operating voltage
(see 3.1) and measure the operating current for each RF position, using the test setup of figure 2. Repeat the above
procedure with the switch at the lowest and at the highest operating temperatures specified (see 3.1).
4.7.7 Holding current (fail-safe and selective type switches (see 3.9). The holding current for each RF position
shall be measured using the same procedures and equipment as 4.7.6. The holding current shall be measured at
room ambient temperature, at minimum operating temperature and at maximum operating temperature.
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