Surveying the internal resistance of a sensitive electric current meter is a rather difficult and complicated electromagnetic experiment which is hard to get a high precision.

灵敏检流计内阻测量实验是电磁学实验中一个比较复杂有相当难度的实验，难就难在如何提高测量精度。

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Theinstrument is designed based on electromagnetic theory and principle of equilibrium in mechanics and composed of a timer, a current regulator and meter, control circuits and two-arm pinchers.

该仪器是根据电磁理论和力学平衡原理设计的，由定时器、电流调节器和电流表、控制电路及电磁夹具所组成。

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