MIL-DTL-12285F
4.7.8 Fungus. To determine conformance to 3.5.6, the switch shall be subjected to the fungus
resistance test for class 1, method B, components specified in ASTM-G21. After 90 days of continuous
incubation the switch shall be tested as specified in 4.7.3. Resultant change in calibration (see 3.5.1)
shall be no more than ± 3ºC (5.4ºF).
4.7.9 Shock. To determine conformance to 3.5.7, the switch shall be mounted to simulate actual
mounting in use. The unit shall be subjected to the shock test as specified in MIL-STD-202, method 202,
in such a manner that an impact of 100g will be obtained. The test shall be repeated 10 times and
applied in the vertical axis while the test unit is in its normal mounting orientation. Subsequently the
switch shall be subjected to the test specified in 4.8.3. Resultant change in calibration (see 3.5.1) shall
be no more than ± 3ºC (5.4ºF).
4.7.10 Vibration. To determine conformance to 3.5.8, the switch shall be mounted in a test fixture
simulating actual mounting in use and shall be connected in a series circuit with a 24 vdc (nominal) power
source and applicable indicator. Care shall be taken to see that the mounting is free from resonances
over the frequency range. While energized, the switch shall be subjected to a simple harmonic motion
having an amplitude of 0.03 inches or 50g peak, whichever is less. Tolerance of ± 10 percent is
permissible for the amplitude. The vibrational frequency shall be varied over the range from 10 to 3500
cps. Rate of frequency change shall be logarithmic. When there is no provision for logarithmic cycling,
other automatic cycling rates of frequency change may be used. The vibrational cycle from 10 to 3500
and back to 10 cps shall be accomplished in 20 ± 2 minutes. This scanning cycle shall be repeated three
times in order that critical (see 6.4.2) frequencies may be identified, recorded and checked. After the
scanning cycles, the switch shall be vibrated at the critical frequency for two hours. If there is more than
one critical frequency, the two hour period shall be divided equally between the critical frequencies. If
there are more than three critical frequencies, the three more critical shall be selected and the switch
vibrated for 40 minutes at each of the frequencies selected. If no critical frequency is identified, the
specimen shall be vibrated at 50g acceleration, with frequency cycled from 10 to 3500 and back to 10
cps. Rate of change of frequency shall be logarithmic or where there is no provision for logarithmic
cycling, other automatic cycling rates of frequency change may be used. Time for each cycle shall be 20
± 2 minutes. Duration of the test shall be two hours (six complete cycles). At the end of the two hour
vibrational period, the switch shall be subjected to the test specified in 4.7.3. This test procedure shall be
accomplished along each of three mutually perpendicular axes. Total vibrating time shall be nine hours
(three hours along each side).
4.7.11 Endurance. To determine conformance to 3.5.9, the sample shall be mounted as specified in
4.3 and positioned so that it is covered by the circulating oil bath to the smaller end of the tapered thread.
Connect the switch in series to the lamp and the voltage supply. The switch shall be subjected to 2500
measured calibration shall remain the same as the recorded calibration (see 4.7.3) within ± 3ºC (5.4ºF).
5 PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military service's system commands.
Packaging data retrieval is available from the managing Military Department's or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
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