EN ISO 389-3:1998
聲學.校正聽力設備的基準零級.第3部分:純音和骨傳導振動器的參考等效極限力水平[代替:CEN EN 27566]
Acoustics - Reference Zero for the Calibration of Audiometric Equipment - Part 3: Reference Equivalent Threshold Force Levels for Pure Tones and Bone Vibrators [Superseded: CEN EN 27566]