Geodetski list, Vol. 64 (87) No. 4, 2010.
Izvorni znanstveni članak
Automation of Testing the Precision of Levels and Calibration of Invar Levelling Staves
Mladen Zrinjski
orcid.org/0000-0003-0834-6009
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Đuro Barković
orcid.org/0000-0003-3382-253X
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Ivan Razumović
orcid.org/0000-0001-9126-8712
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
The determination of heights by means of the method of geometric levelling belongs to the most precise geodetic measurements. In the paper there are all errors described influencing the measurements in geometric levelling. The procedure of testing the precision of levels according to the complete test of the standard HRN ISO 17123-2:2004 (HRN ISO 2004b) is described in details. For the purpose of testing the precision of levels according to this standard there has been the programme Nivelir_ISO developed. The errors that cannot be eliminated in field conditions are staff scale error, the error of irregularly defined staff scale and the error of determining the invar temperature coefficient. These errors can be determined only by testing and calibrating on the comparator in the Laboratory for Measurements and Measuring Techniques at the Faculty of Geodesy, University of Zagreb. The procedure of calibrating the invar levelling staves is carried out according to the standard HRN ISO 12858-1:2004 (HRN ISO 2004a). For the purpose of automating the calibration on the comparator the programme KOMPA has been developed. As the output result of calibrating the invar levelling staff we obtain the Comparison Report. The performed measurements in precise levelling of high accuracy have to be corrected for the values obtained by calibrating a pair of invar levelling staves on the comparator.
Ključne riječi
automation; precise level; comparator; incremental measuring system; calibration; invar levelling staff; measuring uncertainty
Hrčak ID:
64685
URI
Datum izdavanja:
15.12.2010.
Posjeta: 3.375 *