DS/EN 61094-2:1994 Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
2009DS/EN 61094-2:2009 Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
1994DS/EN 61094-2:1994 Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique