Abstract:Electronic theodolites have the advantages of providing quick and high-precision objective readings, and thus can reduce work intensity. In addition, the measurement results are easily entered onto a computer. This type of equipment is widely used in basic map surveying, such as in construction, the military, aviation, water conservancy, transportation, and earthquakes, and plays an extremely important role in measurement of deformation. To ensure measurement accuracy of electronic theodolites, metrological verification of the measurement accuracy indexes is crucial. One of the main indicators of theodolite measurement accuracy is the value of one measuring-process standard deviation in the horizontal direction. Using the requirements of the verification regulation and beginning with the measurement principle, method, and uncertainty analysis, a comparison of two verification methods was carried out for one measuring-process standard deviation in the horizontal direction for an electronic theodolite. The results indicated that the multi-tooth indexing table method and multi-objective method are performed in the same way, and the results of the uncertainty in measurement are consistent. This may be because during the actual process of metrological verification, changes in the metrological verification personnel, environmental conditions, or other factors caused the measured results to be slightly different.
