New approach to vertical angle calibration

Abstract

Testing and calibrating geodetic instruments is an important metrological procedure in precise instrumentation used in industry and geodesy. Electronic geodetic measuring instruments consist, among the other elements, of the circular scales and angular encoders for angle determination in two perpendicular planes - horizontal and vertical. Accuracy of the instrument mostly depends on the accuracy of the angle standards used for angle measurement. Many methods are developed for angle calibration but most of them are available for calibration of flat angles. The method described in International Standard validates the field testing of geodetic instruments by taking precise angle readings between the calibrated points placed at long distance and height. It is difficult to create such calibration basis and inconvenient to proceed this in the field at long distances. There is not traceability of length and angle measurements ensured. The new method of calibration of vertical angles of geodetic instruments was developed which principle of indoor testing and calibration of vertical angle measuring system of total station here is described.