Abstract
<p>Metrological procedures require a leveling staff calibration for an estimation of a true staff scale. The calibration process is usually realized on laboratory comparators. Two automatic comparators for digital level calibration were built by the staff of Department of Geomatics. This article brings some information about properties of developed systems and about a control software for the comparators.</p>
Highlights
In the year 2009 the horizontal comparator was modernized in the metrological laboratory in Kuala Lumpur in the frame of cooperation between Department of Advanced Geodesy ( Department of Geomatics) at the Czech Technical University (CTU) and Department of Surveying and Mapping Malaysia (JUPEM)
The model solution for this innovation was rebuilding of the comparator in laboratory of CTU Prague where the functional prototype of this system was designed in the way of rebuilding of older calibration bench
In the time of usage of the comparator in JUPEM there occurred no defect, employees of the office were theoretically and practically trained and they manage the work with comparator without any problems
Summary
The second method can be automatized thanks to the availability of digital levels remote control and an automatic reading Advantage of this system is the recent determination of reading precision of level (but without influence of compensator function ability). During the system calibration process level height reading is changed through staff shifting and this change is compared with a length variance measured by the interferometer. It provides a height deviation as output, which can be processed by linear regression and provides staff scale. In the case of horizontal comparator, real disadvantage is a limited distance of level and the staff given by mirror dimensions
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