DIN EN ISO 389-7-2017 声学.测听设备校准用的参考零点.第7部分:自由场和扩散场听力条件下的参考听觉阈(ISO 389-7-2005+Amd 1-2016);德文版本EN ISO 389-7-2005+A1-2016
Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions (ISO 389-7:2005 + Amd 1:2016); German version EN ISO 389-7:2005 + A1:2016