ISO 4869-2:2018 pdf free
ISO 4869-2:2018 pdf free.Acoustics一Hearing protectors
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4869-1, Acoustics一Hearing protectors一Part 1: Subjective method for the measurement of sound attenuation
ISO 9612:2009, Acoustics一Determination of occupational noise exposure一Engineering method
IEC 61672-1, Electroacoustics一Sound level meters一Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4869-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
– ISO Online browsing platform: available at https://www.iso.org/obp
– IEC Electropedia: available at http://www.electropedia.org/
This value is rounded to the nearest integer. It can then be stated that the effective A-weighted sound pressure level will be less than or equal to 82 dB for 84 % of the individuals when the hearing protector is properly worn by various people in this noise environment.
The calculation example shown here is provided via an Excel-sheet at standardsiso.org/iso/4869/-2/ed:2/en as well, by which the user may carry out own calculations.ISO 4869-2 pdf download.
