Laser beam shifting, power stability and intensity distribution symmetry of laser spots are the main parameters affecting collimation accuracy.

激光光束的漂移，功率稳定性和激光光斑的强度分布对称性是影响准直精度的主要参数。

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Experimental results show that this collimation measurement method has high accuracy and good repetition, and can be used in the stripe precise inspection of code-bar invar grade rod.

实验结果表明，该瞄准检测方法的准确度高、重复性好，可用于条码型铟瓦水准尺的分划精度检测。

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In this paper, errors of digital levels are introduced. Calibration methods of the collimation error and the system accuracy are presented.

分析了数字水准仪系统的误差源，阐述了仪器i角误差和综合精度的检定方法。

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