Helmet

Description

1. General Description Model TMTï&frac*4;5 armored compound helmet is composed by helmet and communication cap, which is mainly composed by cap sheath, air-conducted anti-noise transmitter, electromagnetic receiver, sound-proof earmuff, adapter cable and plug. It is the necessary device for the tank and other armored vehicles for inter-com communication and out communication with the broadcasting station. It also can reduce the noise and protect crewmen’s’ listening. The helmet has penetration-proof performance; the communication cap has the advantages of sound-proof, high reliability performance; the earmuff has high sound-proof performance, which has great noise reduction and clear voice communication transmitter; the electromagnetic receiver has the wide band and low distortion features. This product can attenuate the noise under the high noise environment and relieve fatigue causing by environment noise, so, it can improve the understandability of the voice communication. 2. Environment Conditions Operation temperature: ï&frac*4;*0℃ï&frac*2;ž*5℃ Storage temperature: ï&frac*4;*0℃ï&frac*2;ž*0℃ Relative humidity: ≤*8ï&frac*4;… Atmosphere pressure: *6kPaï&frac*2;ž**6kPa Environment noise: ≤**0dB 3. Technical Parameter 3.1 Transmitting a Impedance: **0Ω ± *2.5% (***0Hz) b Sensitivity: ï&frac*4;*7 ± 3dB/Pa (**0ï&frac*2;ž***0Hz) (1V, when the value is 0dB ) c S/N: ≥*0dB 3.2 Receiving a Impedance : **0 ± **0Ω (**0ï&frac*2;ž***0Hz) b Sensitivity: *9± 3dB/mW (***0Hz) (*0Î&frac*4;Pa, when the value is 0dB) c Sound insulation mass of the ear muff: ≥ *0dB