规定了电容话筒的机械尺寸和某些电声特性，电容话筒用作实验室标准，用于实现声压单位和可达到的最高精度的声压测量。本规范旨在确保通过互易法进行初步校准。 建立一个系统，根据实验室标准电容话筒的尺寸和性能，将其分为多种类型。

Specifies mechanical dimensions and certain electroacoustic characteristics for condenser microphones used as laboratory standards for the realization of the unit of sound pressure and for sound pressure measurements of the highest attainable accuracy. The specifications are intended to ensure that primary calibration by the reciprocity method can be readily carried out. Establishes a system for classifying laboratory standard condenser microphones into a number of types according to their dimensions and properties.