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.
本文以测量回路中的接触电阻为例，讨论微小电阻的测量方法。
We regard the contact electric resistance of measuring in the circuit as an example in the text, and discuss method of measurement of small electric resistance.
本文以测量回路中的接触电阻为例，讨论微小电阻的测量方法。
We regard the contact electric resistance of measuring in the circuit as an example in the text, and discuss method of measurement of small electric resistance.
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