介绍了钳形接地电阻测试仪的测试原理，即在测量时必须要有一个供电流流过的有效的闭合回路。
It describes the measure principle of the clamp grounded resister tester, that is, a effective close loop for current flow is necessary when doing the test.
与传统的测试方法相比高压断路器回路电阻测试仪的特点是：测试精度高、试验速度快。
Comparing to the traditional method this device has high testing accuracy and high testing speed to fit the testing requirement.
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