用于校准仪表的所有校准仪体积应通过校准而非理论计算确定。容量校准仪有一个精确的参考体积，该体积由公认的校准方法确定。测定该参考体积的技术包括水尺法、标准仪表法和重量校准法。本标准仅描述了校准的吸水方法，该方法用于准确确定排水和储罐校准器的校准体积。

All prover volumes used to calibrate meters shall be determined by calibration and not by theoretical calculation. Volumetric provers have an exact reference volume, which has been determined by a recognized method of calibration. Techniques for the determination of this reference volume include the waterdraw, master meter and gravimetric methods of calibration. This standard describes only the waterdraw method of calibration, which is used to accurately determine the calibrated volume of both displacement and tank provers.