1. The measurement section should be a representative section on a surface plate, such as two diagonal lines, four side lines, two center lines.

 

2. The measuring points should be representative points on the plate, such as the four corner points, the center point of the plate, the midpoint of the four sides.　　

 

3. The measuring section and measuring points shall be uniformly distributed, so as to reflect the condition of the entire plate and facilitate the transformation of the base surface.

 　　

4. The distance between two measuring points on the same cross-section should be able to divide the length of the measuring cross-section, and the cross-section should be divided into even-numbered segments as much as possible, so that the measurement of the midpoint of the surface plate and the end of the midline can be better overlapped, which is convenient for data processing.

 

5. The number of measuring points should be appropriate, too few can not reflect the actual situation of the entire working face, too much measurement is complicated, then measurement error increases. The number of measuring points is generally determined according to the size of the tested plate and the level of processing accuracy. According to statistical experiments, the number of measuring points is preferably 10-50.

 

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