研究了一种新型直流电流比较仪，它包括两个环节：双向自饱和磁放大器和双铁芯自饱和磁放大器。

A new type of DC current comparator is researched which includes two parts: a bidirectional self saturating magnetic amplifier and a two care self saturating magnetic amplifier.

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相对于修正反正切函数模型，能更为合理地预测铁芯深度饱和后的特性。

Compared with modified arc tangent function model, it is more reasonable for predicting the slope of the characteristic of the core at deep saturation.

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要求变压器铁芯具有低的高频损耗，高动态磁导率，高饱和磁感应强度和低的剩磁比。

So the transformer core material is required to be the one with properties of low losses at high frequency, high dynamic permeability, high saturation induction and low remanence.

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