如果信号源或测量装置的回路侧被连接到相同点，干扰将最小。
If the return side of the signal source or the measuring device is connected to this same point, there will be a minimum of interference.
测量的灵敏度是可以探测出的被测信号的最小变化量。
The sensitivity of a measurement is the smallest change of the measured signal that can be detected.
首先利用圆柱度仪和角尺对被测件进行测量，同时采集原始测量数据，然后利用最小二乘法实现平面度误差的评定。
While the plane is measured by using the cylindricity measuring instrument and square, the data acquisition should be done at the same time.
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