MIL-PRF-22885H
3.20 Vibration. When switches are tested as specified in 4.7.15, there shall be no opening of closed contacts or
closing of open contacts in excess of 10 microseconds (µs). During the test, the lamp circuit shall have no electrical
discontinuity in excess of 10 milliseconds (ms). At the conclusion of the test, there shall be no broken, loose,
deformed, or displaced parts.
3.21 Shock (see 4.7.16).
3.21.1 Method I. When switches are tested as specified in 4.7.16.1, there shall be no opening of closed contacts
or closing of open contacts in excess of 10 µs. At the conclusion of the test, there shall be no broken, loose,
deformed, or displaced parts. No part of the switch shall become displaced from its normal (ready to operate)
position during shock testing.
3.21.2 Method II (when specified) (see 3.1 and 6.2). When switches are tested as specified in 4.7.16.2, there shall
be no opening of closed contacts or closing of open contacts in excess of 20 ms and the switch shall be retained in
the panel by its mounting means. No part of the switch shall become displaced from its normal (ready to operate)
position during shock testing. At the conclusion of test, the switch shall be electrically and mechanically operable.
3.22 Acceleration (when specified) (see 3.1 and 6.2). When switches are tested as specified in 4.7.17, there shall
be no opening of closed contacts or closing of open contacts, and there shall be no mechanical or electrical damage
3.23 Moisture resistance. When switches are tested in the wet condition as specified in 4.7.18, the insulation
resistance shall be not less than 10 megohms. At the end of the drying period, the insulation resistance shall not be
less than 1,000 megohms. At the conclusion of the test, there shall be no excessive corrosion, breaking, cracking,
spalling, or loosening of terminals, and mounting hardware shall be readily removable. Excessive corrosion is
defined as that which interferes with the electrical or mechanical performance and has penetrated the plating and has
attacked the base material.
3.24 Dielectric withstanding voltage. When switches are tested as specified in 4.7.19, there shall be no flashover,
arcing, breakdown, or current flow in excess of 500 microamperes.
3.25 Seal (applicable to enclosure requirements 2, 3 and 4) (see 3.1 and 6.2). When switches are tested as
specified in 4.7.20, there shall be no leakage of water through the panel seal into the lamp module or into the switch,
as determined by visual examination and the dielectric test of 4.7.19.1. Under group A visual inspection, there shall
be no pinholes or other surface defects.
3.26 Marking visibility. When switches are examined as specified in 4.7.21, all required markings shall be legible
(see 3.45).
3.27 Salt spray (corrosion). When switches are tested as specified in 4.7.22, there shall be no evidence of
excessive corrosion. Excessive corrosion is defined as that which interferes with the electrical or mechanical
performance and has penetrated the plating and has attacked the base material.
3.28 Insulation resistance. When switches are tested as specified in 4.7.23, the insulation resistance shall be not
less than 1,000 megohms.
3.29 Short circuit. When switches are tested as specified in 4.7.24, there shall be no welding or sticking of
contacts, or damage. Switches shall be mechanically and electrically operative at the end of the test.
3.30 Explosion. When switches are tested as specified in 4.7.25, the explosive mixture in the test chamber
surrounding and external to the switch shall not explode, whether or not explosion occurs within the switch. The
switch shall be electrically and mechanically operable at the conclusion of the test.
3.31 Sand and dust. When specified (see 3.1), switches shall be tested as specified in 4.7.26. There shall be no
operating characteristics degradation and the switches shall be mechanically and electrically operative at the
conclusion of the tests.
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