MIL-PRF-24236D
4.6.12 Terminal strength (see 3.17). Switches shall be tested in accordance with method 211 of MIL-STD-202.
The following details and exceptions shall apply:
(a)
Test condition - A.
(b)
Applied force - 4-1/2 pounds. For wire lead terminals, the applied force shall be 15 pounds.
(c)
Direction of force - Force shall be applied along three mutually perpendicular axes of the terminal,
one direction of which shall be the one most likely to cause failure.
(d)
Time duration - One minute.
(e)
Examinations after test - Switches shall be examined for evidence of breaking, loosening,
cracking, and other damage affecting the operation of the switch. (Bending of terminals shall not
be considered as damage to the switch.)
4.6.13 Moisture resistance (see 3.18). Switches shall be tested in accordance with method 106 of MIL-STD-202.
The following details and exceptions shall apply:
(a)
Mounting - Switches shall be mounted on a corrosion-resistant metal panel with the
terminal-header side and sensing element exposed to chamber ambient conditions.
(b)
Polarization voltage - During steps 1 to 6 inclusive, a polarizing voltage of 100 volts dc shall be
applied between all terminals tied together and the metal panel. The negative polarity shall be
applied to the metal panel.
(c)
Steps 7a and 7b - Not applicable.
(d)
Loading voltage - Not applicable.
(e)
Final measurements - Within 5 minutes after removal from the chamber, and while the switches
are still wet, insulation resistance shall be measured as specified in 4.6.9. At the end of the drying
period, insulation resistance shall again be measured as specified in 4.6.9.
(f)
Examinations during final measurement and after test - Switches shall be examined for evidence
of corrosion, breaking, cracking, and spalling.
4.6.14 Flame response (when specified, see 3.1 and 6.2.2) (see 3.19). The switches shall be subjected to a flame
of 2,000 degrees F +50 degrees F that envelops the sensing element of the switch for 1 minute. This cycle shall be
repeated 3 times and shall meet the requirements of 3.19 each time.
4.6.15 Short circuit (see 3.20). Switches shall be inserted in a circuit which has been calibrated using a dummy
switch, and which will supply a current equal to 15 times the rated resistive load at the lowest dc voltage specified
(see 3.1), when monitored through the switch contacts. Each switch shall be connected in series, by 1-foot lengths of
wire, to a thermal-type circuit breaker or a fuse in accordance with figure 1 and table V. A circuit breaker shall be used
for switches having a rated resistive load of 5 amperes or greater, and a fuse for switches having a rated resistive
load less than 5 amperes. The wire shall be of a size for use in free air as listed in table V, determined by the rated
resistive load of the switch (see 3.1). If the rated load of the switch does not coincide with a wire size, the next larger
wire size shall be used. The terminals shall be in accordance with SAE-AS7928. The circuit breaker shall be in
accordance with SAE-AS58091 and table V, and fuses shall be in accordance with MIL-PRF-15160 and table V, and
of the same current rating as the resistive current rating of the switch. Calibration shall be made without the circuit
breaker (or fuse), test switch, or switch leads in the circuit. With both the switch under test and the circuit breaker in a
closed position, and with switch S2 in the position shown on figure 1, the circuit breaker shall be closed manually by
switch S1. A minimum of 2 minutes shall elapse between the successive closings of the switch. The test shall be
conducted five times.
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