Standard No.:	GB/T 4854.1-1999
English Name:	Acoustics--Reference zero for the calibration of audiometric equipment--Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
Chinese Name:	声学 校准测听设备的基准零级 第1部分:压耳式耳机纯音基准等效阈声压级
Chinese Classification:	A42    Physics and Mechanics
Professional Classification:	GB    National Standard
ICS Classification:	17.140.99 17.140.99    Other standards related to acoustics 17.140.99
Issued on:	1999-03-08
Implemented on:	1999-9-1
Status:	superseded
Superseded by:	GB/T 4854.1-2004 Acoustics?Reference zero for the calibration of audiometric equipment?Part 1:Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
Superseded on:	2004-12-1
Abolished on:	2004-12-01
Superseding:	GB/T 4854-1984
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	150.00
Delivery:	via email in 1~3 business day

为推动全世界在听阈级测量的表示中的统一性与一致性，本标准为听力计用的听阈级的分度规定了基准零级。本标准阐述的资料可直接用于听力计的校准，即表示为在GB/T 7342中示例腔测量的两种不同标准耳机的响应，以及在GB/T 7614中仿真耳上测量的其他压耳式耳机的响应。本标准基于若干负责测听标准的标准实验室和科学出版式物所提供的评价。所推荐的基准级的导出及应用见附录A。