ARRANGEMENT FOR PRECISION RECIPROCITY CALIBRATION OF CONDENSER MICROPHONES

This paper describes a precision ac null-detecting arrangement that has a resolution of better than 0.001 dB for reciprocity calibration of condenser microphones. Systematic errors are analyzed in depth. The uncertainty of the absolute open-circuit sensitivity is predicted to be less than 0.005 dB, which is approximately an order of magnitude improvement over conventional calibration arrangements. With international standardization, a comparison accuracy of a few thousandths of a decibel can be achieved. © 1979, Acoustical Society of America. All rights reserved.