Standard No.:	GB/T 25498.3-2010
English Name:	Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
Chinese Name:	电声学 人头模拟器和耳模拟器 第3部分：校准压耳式测听耳机用声耦合器
Chinese Classification:	A59    Acoustic Measurement
Professional Classification:	GB    National Standard
ICS Classification:	17.140.50 17.140.50    Electroacoustics 17.140.50
Issued by:	AQSIQ, SAC
Issued on:	2010-12-1
Implemented on:	2011-5-1
Status:	valid
Superseding:	GB 7342-1987 测听耳机校准用IEC临时参考耦合腔
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	160.0
Delivery:	via email in 1~3 business day

GB/T25498的本部分规定了听力计校准中,以压耳式测听耳机为负载的具有一定声阻抗的声耦合器结构和特性,频率范围为125Hz~8000Hz,该测听耳机在GB/T4854.1中规定。
耳机在耦合器中产生的声压级一般不等于在人耳内产生的声压级。然而,为了听力计指标具有互换性以及测听耳机的校准,本部分规定的装置适用于简单快速方法。