THE ISO STANDARD ON HEARING PROTECTORS
The International Organization for Standardization (ISO) has the “ISO 4869 Acoustic – Hearing Protectors” standard that deals with everything regarding hearing protectors. It is an omnibus document divided in six parts as follows:
Part 1: Subjective method for the measurement of sound attenuation
Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn.
Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs
Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects
Part 6: Determination of sound attenuation of active noise reduction ear-muffs.
Standards are required to be reviewed and updated periodically, usually within 5 years. Parts 1, 2 and 6 have been examined at the last meeting of the Working Group 17, Hearing Protectors.
In our presentation we will focus on some of the above documents that are of special interest to Canada.
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