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在用霍尔元件测磁场时，一般采用对称测量法以消除各种附加电压的影响，当出现某种附加电压大于霍尔电压这种特殊情况时，该测量方法更为必要．
In the Hall element magnetic field measurement, the general symmetrical measurement method to eliminate the impact of a variety of additional voltage, when the additional voltage is greater than the Hall voltage of a special case, the measurement method is more necessary.