BS EN ISO 4869-3-2007 声学.听力保护器.用声学试验器具测量耳罩式保护器的插入损耗

标准号：BS EN ISO 4869-3-2007
中文标准名称：声学.听力保护器.用声学试验器具测量耳罩式保护器的插入损耗
英文标准名称：Acoustics - Hearing protectors - Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
标准类型：L31
发布日期：2007/8/31 12:00:00
实施日期：2007/8/31 12:00:00
中国标准分类号：L31
国际标准分类号：13.340.20
适用范围：This part of ISO 4869 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 this part of ISO 4869 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. For the testing of certain ear-muffs (such as those attached to safety helmets, or those with contoured earcups or ear-cushions, or supra-aural ear-muffs), the procedure described in this part of ISO 4869 might need to be modified.