Precision method for pressure calibration of one-inch standard condenser microphones by the reciprocity technique

This document outlines a precise methodology for calibrating 1-inch condenser microphones using the reciprocity technique under pressure conditions. Reciprocity stands as a fundamental primary standard method for acoustic calibration, relying on the physical principle that the microphone's receiving and transmitting characteristics are identical under specific operational conditions. The procedure involves a specialized setup where three microphones are interchanged in various pairs within a coupling volume to determine the free-field response without requiring reference to an external standard of known sensitivity. This approach ensures traceability to fundamental electrical and mechanical parameters, thereby establishing high accuracy for pressure measurements in confined spaces. The described protocol defines the necessary environmental controls, electrical connection configurations, and mathematical algorithms required to compute the calibration factors. It serves as a reference for achieving consistent and reliable measurement results in acoustic testing laboratories worldwide, ensuring uniformity in microphone performance assessment for a wide range of applications involving sound pressure levels.