MIL-PRF-22885H
4.7.15 Vibration (see 3.20). Switches shall be tested in accordance with MIL-STD-202. The following details and
exceptions shall apply:
a.
Test condition:
For vibration grade 1: Method 201 (10 Hz-55 Hz).
(1)
For vibration grade 2: Method 204, test condition A (10 Hz-500 Hz).
(2)
For vibration grade 3: Method 204, test condition B (10 Hz-2,000 Hz).
(3)
b.
Tests and measurements prior to vibration: Not applicable.
c.
Mounting: Switches with lamps shall be rigidly mounted by their normal means on a rigid metal panel. The
mounting fixture shall be free from resonance over the test frequency range. Switches that are designed to
mate with connectors shall be tested using the complete connector assembly. If switches incorporate an
edge-lit panel mounting spacer, one-half of the sample units shall be mounted with the spacer in front of the
panel. The remaining half shall be mounted with the spacer behind the panel or without the spacer, as
applicable.
d.
Electrical load conditions: The electrical load shall consist of the monitor circuit only. In addition,
magnetically held units shall be tested with 80 percent rated dc voltage applied to coils.
e.
Measurements during vibration: All open and closed contact circuits shall be monitored for contact chatter in
accordance with method 310 of MIL-STD-202, test condition A. The lamp circuits shall be monitored by a
similar circuit capable of detecting discontinuities of 10 ms or greater. Half of the units shall be tested with
the actuating means in one position and the other half of the units shall be tested with the actuating means
in an alternate position. Open circuits may be connected in parallel and monitored for closing, and closed
circuits may be connected in series and monitored for opening. In the event of indication of contact
instability, the test shall be modified by successive testing in the same plane to monitor contacts, switch by
switch, to determine if a switch is defective.
f.
Test and measurements after vibration: Switches shall be examined for evidence of broken, deformed,
displaced or loose parts.
4.7.16 Shock (see 3.21). Switches shall be tested as specified in 4.7.16.1, and in addition, when specified
(see 3.1), switches shall also be tested as specified in 4.7.16.2. The following details and exceptions shall apply to
method I and method II.
a.
Electrical load conditions: The electrical load shall consist of the monitor circuit only.
b.
Half of the units shall be tested with the actuating means in one position and the other half of the units shall
be tested with the actuating means in an alternate position. Open circuits may be connected in parallel and
monitored for closing and closed circuits may be connected in series and monitored for opening. In the
event of indication of opening or closing of contacts greater than that allowed, 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. Magnetically held units shall be tested with 80 percent rated dc voltage applied to
coils. When testing momentary action switches all shall remain in the relaxed position.
c.
Measurements before the test: Not applicable.
d.
Mounting: Switches shall be mounted by their normal mounting means. If switches incorporate an edge-lit
panel mounting spacer, one-half of the sample units shall be mounted with the spacer in front of the panel.
The remaining half shall be mounted with the spacer behind the panel or without the spacer, as applicable.
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