MIL-DTL-3950J
MIL-STD-202. The following details and exceptions shall apply:
a. Contact chatter shall be monitored in accordance with method 310 of MIL-STD-202.
b. Test condition letter - A.
c.
Tests and measurements prior to vibration - Not applicable.
d. Mounting - Switches shall be rigidly mounted by their normal mounting means on a rigid metal
panel. The mounting fixture shall be free from resonances over the test frequency range. Half of
the switches shall be tested in one lever position and the other half of the switches shall be tested
in the alternate lever position.
e. Electrical load conditions - The electrical load shall consist of the monitor circuit only.
f.
Measurements during vibration - Switch contact stability shall be continuously monitored during
vibration. If more than one contact pair is being monitored simultaneously by one chatter
indicator, open contact pairs shall be connected in parallel and closed contact pairs shall be
connected in series during this test. In the event of indication of a contact opening greater than
specified, the test shall be modified so that switches may be individually tested to determine if a
switch is defective.
g. Measurements after vibration - Switching characteristics (see 4.8.4).
h. Examination after vibration test - Switches shall be examined for change in actuated position, and
broken, deformed, displaced, or loose parts.
test condition B. The following details and exceptions shall apply:
a. Contact chatter shall be monitored in accordance with method 310, MIL-STD-202, test condition A.
b. Mounting - Switches shall be mounted by their normal mounting means. Half of the switches
shall be tested in one lever position and the other half of the switches shall be tested in the
alternate lever position.
c.
Electrical load conditions - The electrical load shall consist of the monitor circuit only.
d. Measurements during shock - Switch stability shall be continuously monitored during shock. If
more than one contact pair is being monitored simultaneously by one chatter indicator, open
contact pairs shall be connected in parallel and closed contact pairs shall be connected in series
during this test. In the event of indication of a contact opening greater than specified, the test
shall be modified by applying successive identical blows in the same plane to monitor contacts,
switch by switch, to determine if a switch is defective.
e. Measurements after shock - Switches shall be inspected for switching characteristics (see 4.8.4).
f.
Examination after test - Switches shall be examined for broken, deformed, displaced, or loose
parts.
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