It is inevitable that total station needs to be calibrated in the long-term using. How to verify that the horizontal axis of a circular bubble is parallel to the instrument rotation and how to correct it? Today let’s share it with you. 1. PrincipleAs shown in the graphics, “V” is the rotation axis of total station, and “l” is the horizontal axis of the circular bubble. It is assumed that there is a crossing angle α when “V” axis and “l” axis are not parallel to each other. When the bubble is centered, the mentioned horizontal axis “l” is vertical, and there is an angle “a”, the deviation between the instrument rotation axis and the vertical position. Rotate the instrument in Figure(a) by 180°to be what shown in Figure(b). The instrument is rotated around rotation axis “V”, so...

Coordinate orientation of total station is a necessary work for coordinate staking out and point position measurement in construction survey. Accidental errors can be reduced during coordinate staking out and point measurement through multiple alignment measurements, and fixed errors can be reduced through left and right disk observation, to improve measurement accuracy. However, due to the special properties of the total station, the orientation of the total station can only be determined once. If the view orientation error is 5 ", there is a high probability that you will also have an error of 5 "at all measuring points at this station. Ensuring the accuracy of orientation is the basic premise to ensure the accuracy of staking out point and measuring point. According to our years of measurement experience, attention to details and measures for the directional accuracy of total st...