BS EN 13819-2:2020 pdf free.Hearing protectors – Testing,Acoustic test methods.
BS EN 13819-2 This document specifies acoustic test methods for hearing protectors. The purpose of these tests is to enable assessment of the performance of the hearing protector as specified in the appropriate product standard.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.EN ISO 4869-1:2018, Acoustics一Hearing protectors一Part 1: Subjective method for the measurement of sound attenuation (ISO 4869-1:2018) EN IS0 4869-2:2018, Acoustics一Hearing protectors一Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn (ISO 4869-2:2018) EN ISO 4869-3:2007, Acoustics一Hearing protectors一Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture (ISO 4869-3:2007)device that approximates certain dimensions of an average adult human head and is used for measuring
the insertion loss of earmuffs [SOURCE: EN ISO 4869-3:2007, 3.4, modified – The words “and is used for measuring the insertion loss of earmuffs” have been added. The note has been deleted.]mean algebraic difference in decibels between the one-third-octave band sound pressure level,measured by the microphone of the acoustic test fixture in a specified sound field under specified conditions, with the hearing protector absent, and the sound pressure level with the hearing protector on, with other conditions identical [SOURCE: EN ISO 4869-3:2007, 3.5, modified一The words “mean”, “in a specified sound field under specified conditions” and “with other conditions identical” have been added. “with the hearing protector present” has been replaced by“with the hearing protector on”]either the random incidence sound field or the plane progressive wave sound field shall be used.When using the plane progressive wave sound field, if the requirement for insertion loss is not satisfied, the test shall be repeated using the random incidence sound field. If the requirement for insertion loss is then satisfied, this shall be deemed to be the definitive result;the insertion loss shall be measured at all one-third-octave bands from 250 Hz to 8 000 Hz; in the case of universal earmuffs the insertion loss shall be measured in only one mode of wearing,preferably over- the-head;if means to adjust the headband force is incorporated, the force shall be adjusted to its maximum setting.BS EN 13819-2 pdf downlaod.