scope:

This recommendation describes a simplified technique for calibration of condenser microphone cartridges, commonly known as one-inch microphones, based upon reciprocity pressur calibration by the coupler method. The object of this recommendation is to specify a method of absolute pressure calibration of one-inch condenser microphones used in laboratories for conventional measuring purposes, without requirering the highest obtainable accuracy. The frequency range of the calibration is restricted to 50 Hz-10 kHz. The calibration method described is based on the reciprocity technique using air in a closed cavity as the coupling medium between the microphones. The calibration procedure is simplified - at the expense of the total accuracy of the calibration - in order that the calibration can be carried out without using the most advanced instrumentation and techniques. The error introduced by using this simplified method is estimated to be less than 0.3 dB.