EN ISO 389-2-1996 声学.校正听力设备的基准零级.第2部分:纯音和插入式耳机用的基准等效阈声压级 ISO 389-2-1994
Acoustics - Reference Zero for the Calibration of Audiometric Equipment - Part 2: Reference Equivalent Threshold Sound Pressure Levels for Pure Tones and Insert Earphones ISO 389-2 : 1994