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8.5 NVT-181 Microphone Unit
Performance
a)
Mounting
b)
Device
c)
Directivity
d)
Range of receive
e)
Power supply
f)
Microphone test
g)
Compass safety distance
1)
Standard
2)
Steering
Environmental condition
a)
Operating temperature
b)
Temperature and humidity
c)
Vibration
d)
Protection class
General specification
a)
Size
b)
Mass
c)
Color
Ceiling mount type
Electret condenser microphone
Hemisphere indirectivity
Radius of 3.5m
Supply from the RCU
Built-in speaker for self-diagnosis test
0.1m
0.1m
-15°C to +55°C (IEC60945 protected type)
+40°C, 93% (without dew condensation)
2Hz to 13.2Hz ±1.0mm
13.2Hz to 100Hz 0.7G
IP22
110(w) x 51(d) x 110(h) mm
0.2kg
N2.5
Chapter 8 Specifications
127
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