Error Calibration Methods and Analysis for Digital Level i Angle

This paper analyzed systemically calibration methods and error analysis on i angle with Trimble DiNi03 digital level that was used in coal mine measurement, and got that the Forstner method was a comparative practical calibration method, at the same time, error analysis of i angle error would be carried on. It provided the guarantee for ensuring the accuracy of the instrument and promoting the safe efficient production of coal mine.