适用于主要用于使用规定的探头音调测量人体外耳道声阻抗/导纳的仪器。可以认识到，也可以使用其他探头信号。本标准定义了制造商规定的特性，规定了三种类型仪器的性能规范，并规定了在这些类型仪器上提供的设施。本标准描述了用于认证测试的测试方法，以及进行常规校准的方法指南。 本标准旨在确保在可比试验条件下，使用符合本标准的不同仪器进行的测量结果保持一致。该标准无意限制新功能的开发或合并，也无意阻止创新方法。 IEC 60645-5第一版取消并取代了1991年发布的IEC 61027第一版，并构成技术修订版。

Applies to instruments designed primarily for the measurement of acoustic impedance/admittance in the human external acoustic meatus using a stated probe tone. It is recognized that other probe signals may also be used. The standard defines the characteristics to be specified by the manufacturer, lays down performance specifications for three types of instruments and specifies the facilities to be provided on these types. This standard describes methods of test to be used for approval testing and guidance on methods for undertaking routine calibration. The purpose of this standard is to ensure that measurements made under comparable test conditions with different instruments complying with the standard will be consistent. The standard is not intended to restrict development or incorporation of new features, nor to discourage innovative approaches. This first edition of IEC 60645-5 cancels and replaces the first edition of IEC 61027, published in 1991, and constitutes a technical revision.