A criterion of zero magnetic field point, which is related with the symmetry of current-carrying system, is derived from a simple problem.
从一个简单问题出发，引出关于磁场零值点的一个判据，该判据与载流系统的几何对称性有关。
This method can test phase sequence of phase switcher while rectifying the zero point of phase switcher. This method is simple and value in practice.
该方法可以在对移相器零点校正同时进行移相器相序检验，方法简单，具有实用价值。
Said method is simple, no need for correcting zero point, easy automatization and improves measuring precision.
测量方法简便，不需校对零点，有利于自动化，提高了测量精度。
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