IEC 60318-3:20 14规定了一种声学耦合器，用于在125 Hz至8 000 Hz的频率范围内测量耳上测听耳机。通常，由耳机产生的声压在耦合器中与在人的耳朵中不同。然而，声学耦合器可以用作测量耳上耳机的输出的客观且可再现的手段。它可用于指定用于校准听力计的参考等效阈值声压级。第二版取消并取代1998年出版的第一版，构成技术修订版，包括与上一版相关的以下重大技术变更: -根据IEC 60318的其他部分调整术语和措辞； -引入最大允许不确定性； -以及对静压均衡的修订要求。 关键词:电声、耳聋、助听器

IEC 60318-3:2014 specifies an acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels for the calibration of audiometers. This second edition cancels and replaces the first edition published in 1998 and constitutes a technical revision which includes the following significant technical changes with respect to the previous edition:
- adjustment of terms and wording to the other parts of IEC 60318;
- introduction of maximum permitted uncertainties;
- and revised requirements for static pressure equalization. Keywords: electroacoustics, deafness, hearing aids