INVESTIGATION OF OVERRUN TOLERANCE CURVES OF NOMOGRAM THEODOLITE-TACHEOMETER
At present, the requirements to the accuracy of the results of geodetic measurements in the creation of cartographic materials and in solving engineering and geodetic tasks in various fields of activity are increasing. To perform tacheometric survey, optical and electronic total stations are used. Optical theodolites are easy to use and have a low price compared to electronic devices. The design features of the optical nomogram theodolite-tacheometer ТHЕО-010A Dalta (Zeiss - Germany) are considered in the work. The presence of nomogram curves in the field of view of the theodolite allows to determine the excess when performing tacheometric survey without carrying out additional measurements of the vertical angles of inclination. The standard set of theodolite tests, according to the requirements of the instruction for the technological verification of geodetic instruments, is the determination of the zero point of the MO, the collimation error C, and the verification of the correctness of the installation of the filament grid. At the same time, when working with nomogram theodolite-tacheometer these tests are not enough. To increase the accuracy of determining elevations and elevations of points, it is necessary to determine the true (actual) coefficients of the nomogram curves. In the paper, a technique is proposed for investigating the curves of overrun tolerances of the nomogram theodolite-total station TONE-010A Dalta. The actual values of the coefficients of the nomogram curves and the errors in determining the overrun tolerances in laboratory conditions are determined.