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ÖNORM EN ISO 4869-4:2000-09

Действует
Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs (ISO/TR 4869-4:1998)
This Technical Report specifies a physical test method for level-dependent sound-restoration ear-muffs. The physical measurements are made with the acoustic test fixture (ATF) according to ISO/TR 4869-3 or with a suitable head and torso simulator (HATS) with a suitable acoustic isolation (see clause 7). The results of these tests in
combination with the results from the ISO 4869-1 tests can be used to estimate the effective A-weighted sound pressure level when sound restoration ear-muffs are worn.
The method described is not suitable for measurement of the effective sound pressure level under ear-muffs in the case of impulsive noise nor for active noise reduction ear-muffs.
Diese ÖNORM legt ein physikalisches Messverfahren für Kapselgehörschützer mit pegelabhängiger elektroakustischer Übertragungseinrichtung fest. Die physikalischen Messungen werden mit der akustischen Prüfvorrichtung oder mit einem geeigneten Kopf- und Rumpf-Simulator mit ausreichender Schalldämmung durchgeführt.
ICS
13.340.20 Head. Including helmets, eye-protectors, hearing protectors, ear muffs, teeth protectors and hoods. / Защитные средства для головы. Включая шлемы, защитные приспособления для глаз, ушные противошумные вкладыши и т.д.