DIN EN 61094-2-2009 电声学.扩音器测量.第2部分:根据互惠技术,试验室标准扩音器压力校准主要方法(IEC 61094-2-2009).德文版本EN 61094-2-2009
Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique (IEC 61094-2:2009); German version EN 61094-2:2009