MIL-DTL-5794C
3.6.1.1.2 Pressure extremes (see 4.6.8.1). The response of the microphone unit shall not vary by
more than 4 dB from its initial response at any frequency between 300 and 4,000 Hz. The signal-to-noise
ratio shall not be reduced by more than 2 dB as a result of subjection to pressures ranging from 30 to 3.4
inches of mercury (ground level to approximately an altitude of 50,000 feet).
3.6.1.1.3 Response during rapid pressure changes (see 4.6.8.2). The response of the microphone unit
shall not vary by more than 5 dB from its initial response at any frequency in the range of 300 to 4,000
Hz, during rapid pressure changes corresponding to a rate of 5,000 feet per minute in the range of 30 to
16.7 inches of mercury (ground level to approximately 15,000 feet).
3.6.1.2 Carbon microphone M-51/UR (see 4.6.8.3). The response of the microphone unit at any
frequency in the range of 300 to 4,000 Hz shall not decrease by more than 5 dB from the response at
ground level, when operated at a pressure of 20.4 inches of mercury (corresponding to an altitude of
10,000 feet).
3.6.2 Salt atmosphere. The response of the microphone unit shall not vary by more than 4 dB from its
initial response between 300 and 4,000 Hz, after having been subjected to the salt spray test specified in
4.6.11. There shall be no evidence of destructive corrosion.
3.6.3 Temperature cycling (see 4.6.9). The response of the microphone unit shall not vary by more
than 3 dB from its initial response at any frequency between 300 and 4,000 Hz, after being subjected to
the temperature cycling test specified herein. The resultant signal-to-noise ratio shall not be reduced by
more than 2 dB.
3.6.4 Temperature extremes. The response of the microphone unit shall not vary by more than 4 dB
from its initial response at any frequency between 300 and 4,000 Hz, after being subjected to the
temperature extremes test specified in 4.6.10.
3.6.5 Moisture resistance. The response of the microphone unit shall not vary by more than 3 dB from
its initial response at any frequency between 300 and 4,000 Hz, immediately after being subjected to the
humidity cycling test specified in 4.6.7.
3.6.6 Impact (see 4.6.15). The microphone unit shall withstand the impact test specified herein, with
no resultant structural failure or other defects. In order to meet this requirement, it will be necessary to
fasten the grill to the microphone case by means other than cementing alone. The frequency response
shall not show a change greater than 3 dB from its original response at any frequency between 300 and
4,000 Hz. The resultant signal-to-noise ratio shall not decrease by more than 2 dB.
3.6.7 Vibration. The microphone unit shall have no structural failure or defects and its frequency
response shall be within 3 dB of its initial response at any frequency between 300 and 4,000 Hz, after
being subjected to the vibration test of 4.6.13.
3.7 Marking. The microphone unit shall be marked for identification in accordance with MIL-STD-130
and tested in accordance with MIL-STD-13231. The identification shall include the type designation and
the manufacturer's Part or Identifying Number (PIN) and shall be located as specified on figure 1 and
figure 2.
3.8 Interchangeability. All parts having the same manufacturer's PIN shall be functionally and
dimensionally interchangeable. The total data package requirements of MIL-DTL-31000, in the elements
for product drawings and associated lists, shall govern changes in the manufacturer's PIN.
3.9 Workmanship. Workmanship shall be such that the finished product shall meet all the
requirements of this specification.
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