ISO 389-1:2016规定了适用于纯音骨传导测听用骨振动器校准的以下数据: a） 参考等效阈振动力水平（RETVFL），对应于通过骨传导测听法测定的年轻耳科正常人的听力阈值； b） 骨振子的基本特征以及与受试者和机械耦合器的耦合方法； c） 掩蔽噪声的基本特征和应用于未测试耳朵的基线掩蔽噪声水平。 附录B给出了ISO 389本部分在听力计校准中的实际应用指南。 RETVFL是指在规定的试验条件下，当振动棒施加在机械耦合器上时，以及在与乳突突出部位的正常听力阈值对应的电压水平下通电时，振动棒传递给具有规定特性的机械耦合器的振动力水平。 注1:前额和乳突位置之间的参考等效阈值振动力水平差异值包含在附录C中，以供参考。 注2:ISO 8253-1规定了骨传导测听的推荐程序。

ISO 389-1:2016 specifies the following data applicable to the calibration of bone vibrators for pure-tone bone-conduction audiometry: a) reference equivalent threshold vibratory force levels (RETVFL), corresponding to the threshold of hearing of young otologically normal persons by bone-conduction audiometry; b) essential characteristics of the bone vibrator and the method of coupling to the test subject, and to the mechanical coupler; c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test. Guidance on the practical application of this part of ISO 389 in the calibration of audiometers is given in Annex B. RETVFL is the vibratory force level transmitted to a mechanical coupler of specified characteristics by a vibrator when applied to the mechanical coupler under stated conditions of test and when energized at the voltage level corresponding to the normal threshold of hearing for location on the mastoid prominence. NOTE 1 Values for the differences in reference equivalent threshold vibratory force levels between location on the forehead and mastoid are included for information in Annex C. NOTE 2 Recommended procedures for carrying out bone-conduction audiometry are specified in ISO 8253？1.