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:
200Hz to 6000Hz
Sound pressure level
127 ± 3db SPL /1Mw/1cm at 1KHz, Input 0.273Vrms
5 ohms ,75 ohms or 150 ohms ±15 ohms At 1KHz 1Vrms
-20℃ to +60℃
-20℃ Duration: 96 hours
+60℃ Duration: 96 hours
Less than 5％ at 1KHz 1mW/1cm
Input power 10Mw pink noise 48 hours
Temperature : +40℃±3℃
90% ~ 95%
48 hours (recovery 6 hours)
Drop it no to concrete surface in 3 directions
Cycle: 10 cycles
Frequency: 1800 cycles/min.
Duration: 1 hour in each of 3axes
Terminal strength test
Load 1.5 Kg
Duration: 15sec(shall be normal)