ISO 4869-2:2018 PDF

Scope: This document specifies three methods (the octave-band, HML and SNR methods) of estimating the A-weighted sound pressure levels effective when hearing protectors are worn. The methods are applicable to either the sound pressure level or the equivalent continuous sound pressure level of the noise. Although primarily intended for steady noise exposures, the methods are also applicable to noises containing impulsive components. It is possible that these methods could not be suitable for use with peak sound pressure level measurements. The octave-band, H, M, L or SNR values are suitable for establishing sound attenuation criteria for selecting or comparing hearing protectors, and/or setting minimum acceptable sound attenuation requirements.

ISO 4869-2:2018 Referenced Document

IEC 61672-1:2013 Electroacoustics - Sound level meters - Part 1: Specifications
ISO 4869-1:2018 Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
ISO 9612:2009 Acoustics - Determination of occupational noise exposure - Engineering method

2018 ISO 4869-2:2018 Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn
2006 ISO 4869-2:1994/cor 1:2006 Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn; Technical Corrigendum 1
1994 ISO 4869-2:1994 Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn