BS EN 62489-2-2014 电声学.助听用音频感应环系统.用于评估人体照射限值指南符合性的,环发射低频磁场的计算和测量方法
Electroacoustics. Audio-frequency induction loop systems for assisted hearing. Methods of calculating and measuring the low-frequency magnetic field emissions from the loop for assessing conformity with guidelines on limits for human exposure