
Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
出版:Netherlands Standards

專家解讀視頻
NEN-EN-ISO 4869-1 specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing.
EN-ISO 4869-1: 2018 - Identical
ISO 4869-1:2018 - Identical
ISO 4869-1:2018 - Identical