DIN EN ISO 389-9-2009 声学.听力测定设备校正基准点.第9部分:参考听觉阈等级测定用首选测试条件(ISO 389-9:2009);德文版EN ISO 389-9:2009
Acoustics - Reference zero for the calibration of audiometric equipment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels (ISO 389-9:2009); German version EN ISO 389-9:2009
This part of ISO 389 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.