BS ISO 4869-6:2019涉及主动降噪（ANR）耳罩。它规定了确定有源插入损耗的试验方法和推导总衰减的计算程序。为此，被动模式下的声衰减值也必须已知，并根据ISO 4869-1确定。这些方法适用于稳定的噪声暴露，不适用于含有脉冲成分的噪声。交叉引用:IEC 61094-4ISO 4869-2ISO 11904-1ISO 4869-1ISO 7240-24:2016ISO/IEC指南98-3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 ISO 4869-6:2019 is concerned with active noise reduction (ANR) earmuffs. It specifies the test methods for the determination of the active insertion loss and calculation procedures for deriving the total attenuation. For this aim, the values of sound attenuation in the passive mode also have to be known and are determined according to ISO 4869-1. These methods are intended for steady noise exposures and are not applicable to noises containing impulsive components.Cross References:IEC 61094-4ISO 4869-2ISO 11904-1ISO 4869-1ISO 7240-24:2016ISO/IEC Guide 98-3All current amendments available at time of purchase are included with the purchase of this document.