標準號：BS EN ISO 4869-3-2007
中文標準名稱：聲學.聽力保護器.用聲學試驗器具測量耳罩式保護器的插入損耗
英文標準名稱：Acoustics - Hearing protectors - Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
標準類型：L31
發布日期：2007/8/31 12:00:00
實施日期：2007/8/31 12:00:00
中國標準分類號：L31
國際標準分類號：13.340.20
適用范圍：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.