Product Description
The H-143 type, Dynamic Earphone is a moving coil type earphone designed for use in a headband type headset or specific flight helmets, it also has ground crew support applications. The intended use is to provide audio communications under high noise conditions found in military, civilian and general aviation environments.
It is designed and constructed from quality durable high strength Polycarbonate plastic as well as corrosion resistant metals meeting or exceeding the environmental.
Baseline Performance Characteristics:
Color
Black
Frequency response range
100 to 5000Hz
Sound pressure level
91± 3db SPL /0.1W/10cm at 1KHz,Input 1.378Vrms
Impedance
19 ohms or 300 ohms ±15％ohms @1KHz 1Vrms
Temperature range
-20℃ to + 60℃
-20℃ Duration: 96 hours
+60℃ Duration: 96 hours
Distortion
Less than 5％ at 1KHz 0.1W/10cm
Load test
Input power 0.8W 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)