EN 61094-3:1995 Measurement Microphones Part 3: Primary Method for Free-Field Calibration of Laboratory Standard Microphones by the Reciprocity Technique
2016EN 61094-3:2016 Electroacoustics - Measurement microphones - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
1995EN 61094-3:1995 Measurement Microphones Part 3: Primary Method for Free-Field Calibration of Laboratory Standard Microphones by the Reciprocity Technique