DIN EN 61094-3:2017 电声学.测量传声器.第3部分:用互易技术校准实验室标准传声器自由场的基本方法(IEC 61094-3-2016+COR1-2016);德文版本EN 61094-3-2016+AC-2017-01
Electroacoustics - Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-3:2016 + COR1:2016); German version EN 61094-3:2016 + AC:2017-01