BS EN ISO 4869-2:2018规定了三种方法（倍频带、HML和SNR方法）来估计佩戴听力保护器时有效的A加权声压级。这些方法适用于噪声的声压级或等效连续声压级。虽然这些方法主要用于稳定的噪声暴露，但也适用于含有脉冲成分的噪声。这些方法可能不适用于峰值声压级测量。交叉引用:ISO 9612:2009IEC 61672-1ISO 4869-1购买时可用的所有现行修订版均包含在本文件的购买中。

BS EN ISO 4869-2:2018 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.Cross References:ISO 9612:2009IEC 61672-1ISO 4869-1All current amendments available at time of purchase are included with the purchase of this document.