DS DS/EN 24869-1
DS DSEN 24869-1 1993-MAR-01 Acoustcs - Hearng protectors - Part 1 Subjectve method for the measurement of sound attenuaton
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The standard specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. The method and procedures are designed to yield values close to the maximum attenuation which are not normally attained under field conditions.