NF C97-332*NF EN 61094-2:2009 Electroacoustics - Measurement microphones - Part 2 : primary method for the pressure calibration of laboratory standard microphones by the reciprocity technique
2009NF C97-332*NF EN 61094-2:2009 Electroacoustics - Measurement microphones - Part 2 : primary method for the pressure calibration of laboratory standard microphones by the reciprocity technique