What instrument errors can be eliminated by using the method of "left disk, right disk" and "average observation"?
Through the observation of multiple measurement, and transform the dial position in the measurement, so the reading is evenly distributed in each dial position, can reduce the disk partition error. The influence of collimation and transverse error, can be through the left and right wheel disc observations are averaged to eliminate error, and the vertical axis is not with positive and reverse mirror observation eliminated, therefore, in addition should be examined carefully before observation and correction of alidade level tube, should also be carefully leveled.
Effect of horizontal disc and alidade eccentric error by disk observations are averaged to eliminate left right;
Can eliminate theodolite error.
Can eliminate the eccentric error and error of sighting alidade;Can eliminate the collimation axis perpendicular to the horizontal axis, horizontal axis is not perpendicular to the vertical axis and the horizontal eccentric error reading effect.
