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NEW COMPACT METHOD FOR LABORATORY TESTING EDM INSTRUMENTS_2005
Routine check of EDM instruments is increasingly important. Finding of a suitable testing area, legal access to such areas, time of carrying out the instruments and the costs of permanent installation are problems facing the field calibration. The limited space is main problem facing the laboratory testing of EDM instruments. Some researchers stated that distances between 5 and 100 meters should be measured to test the EDM, so some reflectors have to be mounted outside the laboratory which causes a big change in the atmospheric conditions along the measured distance.
This paper presents a new compact, laboratory method for verification of the accuracy of distance measuring using EDM and total station. This new method complies with the stringent space of the laboratories and no need to mount reflectors outside the laboratory. The mathematical model of this method has been developed and tested theoretically and practically and it gave promising results. The precision of the new method was the same as that of the standard method.
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