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工程测量中 ,水准仪如果精度不高 ,需要进行校正。校正的目的是使水准仪视准面(视准轴水平旋转面)平行于仪器的水准面 ,也就是视准面与水准面同时垂直于仪器的立轴。校正的方法是 ,先测出两点间的两次观测误差 ,计算出误差中间点的塔尺读数(图1) ,调整仪器望远镜上的微倾螺旋 ,使物镜的视平线与误差中线(中间点)相重合。然后松动水准泡的可调端的支承螺丝 ,使气泡
Engineering survey, the level if the accuracy is not high, need to be corrected. The purpose of the calibration is to align the level of the collimation plane (horizontal axis of rotation of the collimation axis) parallel to the level of the instrument, that is, the plane of sight and the plane of elevation are perpendicular to the vertical axis of the instrument. The method of calibration is to first measure the two observation errors between two points, calculate the error of the midpoint of the tower ruler reading (Figure 1), adjust the instrument on the tilt of the telescope telescope, so that the objective lens and the error of the horizon line Intermediate point) coincide. Then loosen the leveling screw on the adjustable end of the leveling screw to make the bubble