The M-87 dynamic microphone is a moving voice coil type microphone designed for use on a headband type headset. The microphone is intended to provide audio communications under high noise conditions found in military, civilian and general aviation aircraft.
It is designed and constructed from quality durable high strength PC plastic as well as corrosion resistant metals meeting or exceeding the environmental.
Baseline Performance Characteristics:
Color
Black
Frequency response
200Hz to 6000Hz
Sound pressure level
127 ± 3db SPL /1Mw/1cm at 1KHz, Input 0.273Vrms
Impedance
5 ohms ,75 ohms or 150 ohms ±15 ohms At 1KHz 1Vrms
Temperature range
-20℃ to +60℃
-20℃ Duration: 96 hours
+60℃ Duration: 96 hours
Distortion
Less than 5％ at 1KHz 1mW/1cm
Load test
Input power 10Mw pink noise 48 hours
Humidity test
Temperature : +40℃±3℃
Relative Humidity
90% ~ 95%
Duration
48 hours (recovery 6 hours)
Drop test
Drop it no to concrete surface in 3 directions
Height: 1M
Cycle: 10 cycles
Vibration test
Frequency: 1800 cycles/min.
Amplitude: 1.5mm
Duration: 1 hour in each of 3axes
Terminal strength test
Load 1.5 Kg
Duration: 15sec(shall be normal)