Acoustics - Reference zero for the calibration of audiometric equipment, Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
声学.测听设备校准用参考零点 第1部分:纯音和超听觉耳机的参考等效阈值声压级
The objective of this Standard is to specify a standard reference zero for the scale of hearing threshold level applicable to pure-tone air conduction audiometers, to promote agreement and uniformity in the expression of hearing threshold level measurements throughout the world.