本推荐实施规程定义了校准不确定度评估的一般观点及其在互感器（its）测试程序中的应用。定义如何考虑测量系统的不确定度来源，以及如何组合它们的影响，以评估测量结果的不确定度。推荐规程还提出了测试期间用于评估ITs精度的通用要求。

This recommended practice defines a common viewpoint of the evaluation of uncertainty in calibration and its application in testing procedures for Instrument Transformers (ITs). Definition of how to take into account the sources of uncertainty of the measurement system and how to combine their effects in order to evaluate the uncertainty on the measurement results. The recommended practice also presents the common requirements to be used during tests for assessing the accuracy of ITs.