3M MT73H7F4D10NA-50 Manual - Página 17
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14 Interfaces
14.1 External interface pin out:
Pin 1
x
EXTERNAL PTT
x
Activated when shorted to Pin 2 (ground)
Pin 2
x
GROUND
Pin 3
x
INPUT
x
The input signal is mixed with the WS™ LiteCom Pro II audio output level
(speaker output).
o
94 mV = Input signal level for which the mean
plus one standard deviation equals 82 dB(A) in cup.
Pin 4
x
BOOM MICROPHONE OUTPUT
x
Applied signal at the boom microphone input comes out on pin 4
o
2, 25 mV Microphone input = 10 mV output
External audio input levels EN 352-6:
Input signal level pin 3 U (mV, RMS)
28,1
49,9
88,8
157,9
Mean sound pressure level in cup(dB(A))
70,8
75,8
80,8
85,7
© 3M Svenska AB
Värnamo, Sweden
Standard Deviation
Sound Pressure (dB)
0,7
0,7
0,7
0,7