标准摘要
[中文适用范围]： ISO 4869 的本部分规定了使用声学测试夹具测量耳罩式听力保护器插入损耗的方法。 该方法适用于作为型式批准或认证程序一部分的性能生产差异的调查，以及性能随使用年限变化的调查。 其目的是确保根据 ISO 4869-1 提交进行主观衰减测试的耳罩听力保护器样品具有该类型的典型性能。 ISO 4869本部分规定的方法不适用于作为型式认可的基本测试。 通过这种方法获得的性能数据并不旨在被引用为代表耳罩的真耳声音衰减，也不旨在代表耳罩提供的保护。 对于某些耳罩（例如附在安全头盔上的耳罩，或带有轮廓耳罩或耳垫的耳罩，或贴耳式耳罩）的测试，ISO 4869 本部分中描述的程序可能需要修改。 [外文原描述]： 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.
英文名称Acoustics — Hearing protectors — Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture