ISO 4869-3:2007规定了使用声学测试夹具测量耳罩式听力保护器的插入损耗的方法。该方法适用于作为型式认可或认证程序一部分的性能生产差异调查，以及对年龄变化表现的调查。旨在确保根据ISO 4869-1进行主观衰减测试的耳罩听力保护器样品具有典型的性能。 ISO 4869-3:2007中规定的方法不适用于型式认可的基本测试。通过该方法获得的性能数据不是引用为表示耳罩的真实耳朵衰减，也不是由耳罩提供的保护

ISO 4869-3:2007 specifies a method for measuring the insertion loss of ear-muff type hearing protectors using an acoustic test fixture. The method is applicable to the investigation of production spreads of performance as part of type approval or certification procedures, and to the investigation of the change of performance with age. It is intended to ensure that ear-muff hearing protector samples submitted for subjective testing of attenuation according to ISO 4869-1 have performances typical of the type. The method specified in ISO 4869-3:2007 is not applicable as the basic test for type approval. Performance data obtained by this method are not intended to be quoted as representing the real-ear sound attenuation of an ear-muff, nor the protection provided by the ear-muff.