common-ground-point

基本解释

In comparision with common visual ray trace, ground line-three angle and intersecting point methods, the new method has three advantages as follows: (1)Perspective drawing is accurate and applicable;
它与通常采用的视线迹点法、基线三角形法、量点法、交点法等相比较，有三个特点：1。理论简单、概念清晰、容易理解；
As with the four-point collinear probe method, a differential measurement may be required if the sample resistance is of the same magnitude as the isolation (meter common to ground) of the voltmeter.
与四点同线探针法一样，如果样品电阻和电压表的绝缘电阻（电压表的公共端到地）是同一数量级的，就可能需要使用差分测量。