MIL-DTL-5794C
TABLE I. Frequency response.
Frequency in Hz
Allowable variation in response from
1,000 Hz values in dB
-5
+1
300
-4
+1
400
-3
+1
500
-2
+1
600
-1
+1
800
0
0
1,000
-1
+1
1,250
-1
+1
1,500
-2
+1
1,750
-3
+1
2,000
+1
-4
2,250
+1
-5
2,500
+1
-6
2,750
+1
-6
3,000
+1
3,250
-6
+1
3,500
-6
+1
3,750
-7
+1
4,000
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TABLE II. Smoothness of frequency response.
Frequency band
Band width
Rate of change
Hz
Hz
dB
300 1,000
400
+3
-1
1,000 2,000
500
+1
-3
2,000 3,000
1,000
+1
-4
3,000 4,000
1,000
+3
-5
3.5.2 Positional characteristics.
3.5.2.1 Microphone unit M-6A/UR. The frequency response shall be not less than 4 dB at any
frequency between 300 and 4,000 Hz, when a sound pressure of 115 dB relative to 20 µPa is established
at the face of the microphone unit with the microphone unit mounted in positions of ± 90 degrees with
reference to the vertical. In each position, the response at any frequency within the range of 300 to 3,000
Hz shall be within ± 5 dB of the response at 1,000 Hz. The difference between any two successive
readings, taken at 200 Hz apart, shall not exceed 3 dB. From 3,000 to 4,000 Hz the change shall be no
more than ± 8 dB from the response at 1,000 Hz.
3.5.2.2 Microphone, carbon M-51/UR. The response of the microphone, when mounted at an angle of
+ 90 degrees (face up) or 90 degrees (face down), shall not be more than 5 dB below the response of
the microphone in the vertical position, at any of the test frequencies. The shape of the curve shall be
similar to the shape of the curve obtained in the vertical position.
3.5.3 Microphone unit resistance (see 4.6.3). The direct current (dc) resistance of the microphone unit
shall be between 40 and 100 ohms.
3.5.4 Noise cancellation (see 4.6.4). The signal-to-noise ratio of the microphone unit shall be at least
13 dB in favor of the signal, for noises of the types encountered in aircraft, boats, tanks, and other
vehicles.
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