NEN 11094-2-1994 Measurement microphones. Part 2: Primary methods for pressure calibration of laboratory standard microphones by the reciprocity technique (IEC 1094-2:1992)
1994NEN 11094-2-1994 Measurement microphones. Part 2: Primary methods for pressure calibration of laboratory standard microphones by the reciprocity technique (IEC 1094-2:1992)