描述模拟成人佩戴者对助听器性能的声学影响的测试方法。 为助听器的模拟原位测量制定了某些指南；它描述了一种模拟现场测量助听器的简化方法，以及在水平面上确定助听器中定向麦克风的方向性指数（DI）的描述。 此外，第二版现在规定了公差。只有当测量结果（由测试实验室实际扩展的测量不确定度扩展）完全在本国际标准规定的公差范围内（由Umax值扩展），才能证明符合本国际标准中的规范

Describes methods for a test which simulates the acoustical effects of a median adult wearer on the performance of a hearing aid. Establishes certain guidelines for simulated in situ measurements of hearing aids; it describes a simplified method for simulated in situ measurements of hearing aids and a description for determination of the directivity index (DI) of directional microphones in hearing aids in the horizontal plane. In addition this second edition now specifies tolerances. Conformance to the specifications in this International Standard is demonstrated only when the result of a measurement, extended by the actual expanded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this International Standard extended by the values for Umax