In this instrument the current comparer is set to zero magnetic flux, then the instrument transformer calibrator with the theory of measurement can measure the error of the current transformer.
仪器使电流比较仪处于零磁通工作状态，再利用互感器校验仪的测差原理测试被检电流互感器的误差，从而使互感器校验仪具有比较仪检定功能。
Theorem 1 constructs a set of universal measure zero using continuous extension;
定理1 主要运用了连续延拓构造了一个泛测度零集；
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