MIL-DTL-11134G
3.5.3.3 Impedance. Thu output impedance of the microphone shall be 40 ohms +20% (see 4.6.2.3.2).
3.5.3.4 Unagitated current. With a bias voltage of 6 volts (dc) and a load resistance of 30 ohms, the bias current
through the microphone prior to agitation shall not exceed 125 milliamperes (dc) (see 4.6.2.3.3).
3.5.3.5 Carbon noise. Carbon noise shall not exceed 2.25 millivolts (mV) (see 4.6.2.3.4).
3.5.3.6 Aging. The frequency response of the microphone following vibration shall be within 2 dB of the response
prior to aging. In addition, carbon noise shall not exceed 12.7 mV and the impedance shall not have increased by
more than twice the value prior to aging (see 4.6.2.3.5).
FREQUENCY - Hz
Frequency
points Hz
300
1,000
2,000
3,000
4,000
Upper
limits (dB)
+36.0
+43.0
+49.0
+52.0
+52.0
Lower
limits (dB)
+29.0
+36.0
+38.0
+38.0
+36.0
FIGURE 1. Microphone response limit curves.
3.5.4 Earphone.
3.5.4.1 Earphone receiver element. Earphone receiver element dimensions shall be in accordance with earphone
drawing SC-C-105379 and insert drawing SC-B-105380 with finish E300 (see 3.3).
3.5.4.2 Response. The acoustic output of the earphone shall be within the limits shown on figure 2, when 2
milliwatts (mW), 1.1 volts at frequencies in the range of 300 to 4,000 Hz is applied to the test circuit (see 4.6.2.4.1).
3.5.4.3 Overload. The earphone shall show no more than 3 dB change from its original response curve, after
being subjected to the test specified in 4.6.2.4.2.
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