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