Electroacoustics. Measurement microphones - Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique1 Scope This part of IEC 61094 specifies a primary method of determining the complex free field sensitivity of laboratory standard microphones so as to establish a reproducible and accurate basis for the measurement of sound pressure under free field conditions, is applicable to laboratory standard microphones meeting the requirements of IEC 610941, is intended for use by laboratories with highly experienced staff and specialized equipment. NOTE The

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Who is ISO 21222 for