Abstract
CHECKING MANUFACTURER’S HEIGHT ACCURACY OF A TOTAL STATION
Prof. Ismat M. Elhassan*
ABSTRACT
It is always expected to test the accuracy of surveying instrument as soon as it is purchased or even after being used for considerable time and at regular intervals to check whether it meets the parameters claimed by the manufacturer or not. This paper reports about a test erformed within the boundary of the college of technology in Riyadh to investigate the accuracy of a SOKKIA SET 530R Total Station (TS) survey instrument available in the college and to compare that with what has been claimed by the manufacturer. An optical automatic precise level (Sokkia B21), supposed to have 1.5 mm accuracy for 1 km double-run levelling, was used to work as reference for testing elevations obtained using this total station. A loop traverse of ten points within the fence of the college was established for the test. Reduced levels of nine of the ten points were determined using Sokkia B21 automatic precise level observations with the tenth point used as a Bench Mark (BM) with a given reduced level. Closure error obtained using the level was 0.002m. The same BM was used as a reference point for the total station to obtain levels of the rest nine test points. Results showed that the accuracy of the height accuracy of the total station was 0.005m when compared to levels of the nine points obtained from the level observations. This result agrees well with the accuracy claimed by the manufacturer.
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