描述了一种声学耦合器，用于在125 Hz至8 kHz的频率范围内，在确定耳机或助听器的物理性能特性时，以指定的声阻抗加载耳机或助听器。它适用于空气传导助听器和耳机，通过耳模或类似设备等耳嵌件连接到耳朵上。 耳机产生的声压在耦合器中通常与人耳中的声压不同。然而，它可以用作交换助听器规格和物理数据以及校准测听中使用的特定插入式耳机的简单而现成的方法。 IEC 60318-5第一版取消并取代了IEC 60126:1973。

Describes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear moulds or similar devices. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used in audiometry. This first edition of IEC 60318-5 cancels and replaces IEC 60126:1973.