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.

youdao

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.

youdao