限流用PTCR过电流动作时间测试仪的研制

The Study and Design of an Overcurrent Actuation Time Tester for PTCRs Used as Current Limiters

本文介绍了PTCR过电流动作时间测量原理,仪器的电路设计和基本性能。利用AC-DC变换技术和数字显示技术研制出了操作简便、读数直观、性能价格比较高的动作时间测试仪,在PTCR动作时间测量时,可以代替价格较贵的记忆示波器。

This paper presents the theory of PTCR actuation time measurement, the design of circuits, and performance of the instrument. By using the techniques of AC-DC conversion and digital display, an actuation time tester was realized and is of such advantages as easiness of operation and reading results and high ratio of performance/cost. It can replace expensive storage oscilloscopes in the measurement of actuation time of PTCRs.