MIL-DTL-11193E
3.3 Switch. The switch shall be capable of operation for a minimum of 500,000 cycles in accordance with 4.7.4
and exhibit a contact pressure of not less than 25 grams in accordance with 4.7.6 when the switch is closed.
3.4 Cleaning. Metal parts, after fabrication, shall be cleaned in accordance with good commercial practice.
Cleaning processes shall have no detrimental, damaging or destructive effect on the equipment. Corrosive material
shall be removed completely before parts are assembled into the microphone. After assembly, units shall be cleaned
thoroughly and shall be free from foreign material.
3.5 Dielectric strength and insulation resistance. The microphone, with Microphone, Carbon M-51( )/UR removed
and the switch in the non-operate position, shall withstand without breakdown, a DC potential of 500 volts and shall
show an insulation resistance of not less than 50 megohms. (see 4.6).
3.6 Operation. When tested in accordance with 4.7.3, operation of the microphone and switch shall be indicated
by the reproduction of audible speech through the test amplifier and loudspeaker. Proper activation of the switch
circuit shall be indicated by the continuity check specified in 4.7.3.
3.7 Service conditions. The microphones shall, meet the requirements of this specification after subjection to the
following conditions.
3.7.1 Temperature.
(a) Operating: Ambient temperature in the range of +150°F (65.5°C) to 40°F (40°C). (See 4.7.1)
(b) Non-operating: Exposure in the range of +160°F (71.1°C) to 80°F (26.6°C). (See 4.7.1)
3.7.2 Relative humidity, non-operating. 90 to 98 percent. (See 4.7.2).
3.7.3 Immersion non-operating. Three feet of water for 2 hours. (See 4.7.5).
3.7.4 Elevation: Up to 10,000 feet above sea level (see MIL-DTL-5794).
3.8 First article samples. The contractor shall furnish six (6) first article samples for approval if required by the
invitation for bids and contract. After approval, one sample will be used exclusively for the interchangeability test in
4.2. This sample shall be kept latest for this purpose.
3.9 Interchangeability. Like units and replaceable parts shall be physically and functionally interchangeable,
without modification of such items for fit or performance or of the microphone. Individual items shall not be hand-
picked for fit or performance (see 4.8).
3.10 Workmanship. All electrical connections shall be tight, taper pins shall be thoroughly seated. Terminal
screws shall be tight. Studs on the switch handle and on the connector shall be properly seated and tight. The
switch shall operate freely and positively. The switch cover shall be properly clamped to insure a moisture proof seal.
There shall be no abrasions or cuts on the cover. Microphone, Carbon M-51( )/UR shall be firmly seated in the
mounting clip. All screws, nuts and other fasteners shall be free of burrs. The mounting hook shall be solidly
mounted In the microphone body. Nomenclature marking shall be clear and distinct. Wiring Identification shall be in
accordance with the drawings. Microphone cover CW-292( )/U shall fit the microphone unit and the window portion
firmly when mounted shall be limp.
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