User manual SENNHEISER HMEC 45-CA

[. . . ] GEBRAUCHSANLEITUNG INSTRUCTIONS FOR USE NOTICE D`EMPLOI ISTRUZIONI PER L`USO INSTRUCCIONES PARA EL USO GEBRUIKSAANWIJZING HMEC 45-CA P/N 045-230-125 HMEC 45-KA P/N 045-230-115 The problem of noise The negative effects of noise pollution have been proven by studies, and everybody will have experienced them: Nervousness Lack of concentration Irritability And these are only the most obvious effects on the human body. Noise also affects the autonomic nervous system and can lead to permanent hearing damage. There are a multitude of noise sources, and the individual very often has no influence over them. [. . . ] The headphone is a Sennheiser NoiseGard® system. This is a dynamic headphone system which, in addition to reproducing the original audio signal, electronically cancels the low frequencies of the ambient noise. This active noise compensation operates on the principle that sound and , , anti-sound" (in phase opposition) cancel each other out. The NoiseGard® compensation circuitry in the headphone requires an extra power supply, so a battery compartment has been integrated into the headset cable (see illustration on the right). Clearly intelligible communication is ensured, and the pilot no longer has to turn the volume up to overcome ambient noise. NoiseGard® increases your comfort, but it is no medical hearing protection! Active noise compensation with NoiseGard® Warning Signal Attenuation in dB 0 Human speech Reduction of the subjectively perceived noise level with Noisgard 10 20 100 200 500 1000 2000 5000 Frequency / Hz Switching the Active noise compensation on and off Inserting the batteries The ON/OFF switch for the power supply of the NoiseGard® circuitry is located on the battery compartment. When power is switched on, a green LED lights up. When the power supply is switched off or when the batteries go flat the headphone works like an ordinary headphone without noise compensation. As the microphone is connected to the aircraft´s internal power supply, it does not depend on the batteries and will remain in operation should the batteries fail. on/off LED Hygiene pads (Accessories, not included in the scope of delivery) Cat. 03553 Adjusting the headband Cable (worn on left or right side) 350° Cable on the left Cable on the right N. B. : NoiseGard® reduces noise and increases comfort. NoiseGard® is not a medical noise protection system! NoiseGard® cannot replace an industrial ear defender system for use in noisy environments! volume up?When people use headphones, they tend to choose a higher volume than with loudspeakers. Listening with high volume levels for a longer time can lead to permanent hearing defects. Because the NoiseGard® circuitry is reducing the ambient noise the headphones can be set at a correspondingly lower level leading to more comfortable hearing conditions so protecting your hearing. Circuit diagram and pin connections HMEC 45-KA headphone capsule left headphone capsule right microphone rd bl screen sensor microphone left sensor microphone right bl rd screen screen bl rd or wh br gn ye cable splice rd bl screen bl rd ye bl bk DC-box Tip PJ­068 microphone Tip PJ­055 headphone Circuit diagram and pin connections HMEC 45-CA headphone capsule left headphone capsule right microphone rd bl screen sensor microphone left bl rd screen sensor microphone right screen bl rd or wh br gn ye cable splice rd bl screen bl rd ye bk DC-box XLR 5 Technical data NoiseGard® HMec 45-KA / -CA Headphone Transducer principle Frequency response Impedance active passive THD Active compensation dynamic, open 20 Hz - 18 kHz 600 (mono) 1. 2 k per side (stereo) 160 (mono) 320 per side (stereo) same volume for active and passive <1% 10 dB ± 3 dB between 400 Hz and 1 kHz Mikrophone incl. preamplifier Transducer principle Noise-cancelling back-electret condenser microphone capsule Frequency response (2 cm distance between mic and corner of mouth) 300 Hz - 5 kHz Max. [. . . ] informaciones actuales sobre los productos Sennheiser. Actuele informatie met betrekking tot Sennheiser producten vindt u ook op Internet onder "http://www. sennheiser. com". Sennheiser electronic GmbH & Co. KG D-30900 Wedemark Printed in Germany Telefon: 05130/600-0 Telefax: 05130/600-300 Publ. [. . . ]