DIN EN ISO 389-2-1996 声学.校正听力设备基准零级.第2部分:纯音和插入式耳机基准等效阈声压级
Acoustics - Reference zero for the calibration of audiometric equipment - Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones (ISO 389-2:1994); German version EN ISO 389-2:1996