標準號：ISO/TR 4869-4-1998
中文標準名稱：聲學 護聽器 第4部分:與電平有關聲音恢復耳罩的有效聲壓級的測量
英文標準名稱：Acoustics - Hearing protectors - Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs
標準類型：C73
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：C73
國際標準分類號：13.340.20
適用范圍：This Technical Report specifies a physical test method for level-dependent sound-restoration ear-muffs. The physical measurements are made with the acoustic test fixture (ATF) according to ISO/TR 4869-3 or with a suitable head and torso simulator (HATS) with a suitable acoustic isolation (see clause 7). The results of these tests in combination with the results from the ISO 4869-1 tests can be used to estimate the effective A-weighted sound pressure level when sound restoration ear-muffs are worn. The method described is not suitable for measurement of the effective sound pressure level under ear-muffs in the case of impulsive noise nor for active noise reduction ear-muffs.