磁电系电表内阻的温度误差及其补偿

The Temperature Error and its Compensation of Internal Resistance of Magnetoelectric Ammeter

磁电系电表的扩程实验,通常采用串联分压电阻或并联分流电阻的方法。在实验中发现,表头的内阻在不同环境温度下,其值有很大的偏差,这种偏差引起改装表测量结果的误差,称为温度误差。文章给出了电表的温度误差原因,并给出了扩展较大量限,准确度等级要求不高(如1.5级)的电表温度补偿方法,进一步提高和完善磁电系电表扩程实验,为修理和制作大量程电表提供参考技术。

The range-enlarging experiment of magnetoelectric ammeter is always realized by means of the split-pressure of resistance in the series connection and the split-flow of resistance in the parallel connection. In the experiment, the temperature error is often found. This paper analyses the causes of this error and offers some ways of temperature compensation, which could improve and such experiments and provides some reference technology of making and repairing the large-range ammeter.