DS DS/EN ISO 4869-4
DS DSEN SO 4869-4 2000-AUG-25 Acoustcs - Hearng protectors - Part 4 Measurement of effectve sound pressure levels for level-dependent sound-restoraton ear-muffs
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This standard specifies a physical test method for determining the sound attenuation of 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.