While the plane is measured by using the cylindricity measuring instrument and square, the data acquisition should be done at the same time.

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。

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We suggest "error of closure" asa criterion of measuring accuracy and use transient root-mean-square error to ex-press repeatability and reliability of measurement of the instrument.

我们提出了闭合误差的概念，作为仪器测量精度的判据，测量仪器的瞬时均方差，以表征测量的重复性和可靠性。

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The method of least square circle is adopted to measure tool, head radius when a tool checking instrument measuring too, parameter.

对刀仪在测量刀具时，采用最小二乘圆法来测量刀尖半径；

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