该仪器电路设计精巧，思路独特，使得其性能优越，功能强大，体积小，重量轻，现场使用极其方便。

The instrument circuit design is exquisite, unique ideas, making its performance is superior, powerful, small size, light weight, extremely easy to use site.

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本文介绍了PT CR过电流动作时间测量原理，仪器的电路设计和基本性能。

This paper presents the theory of PTCR actuation time measurement, the design of circuits, and performance of the instrument.

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文中介绍了该仪器的硬件组成、本质安全性电路设计及整机低功耗的实现。

Furthermore, this paper introduces the hardware constitute, the design of the intrinsically safe circuit and the realization of the low energy consumption of the whole instrument.

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