The principles of an apparatus for Hall effect measurement by using double AC method are presented.
介绍双交流法霍耳效应测量的原理，并说明制作的仪器的结构和样品架制作技术。
After comparing and analyzing several conventional insulating resistance measuring method such as AC method, DC creepage method and so on, their shortcomings in use are pointed out.
对直流系统常用的几种接地电阻测试方法如交流法、直流漏电流法等进行了比较分析，指出了它们在使用中的缺点。
After comparing and analyzing several conventional insulating resistance measuring method such as AC method, DC creepage method and so on, their shortcomings in use are pointed out.
对直流系统常用的几种接地电阻测试方法如交流法、直流漏电流法等进行了比较分析，指出了它们在使用中的缺点。
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