Implementation of the reference force standard in the Croatian metrology and Interlaboratory comparison

摘要

Laboratory for Testing Mechanical properties (LIMS) at the Faculty of Mechanical Engineering and Naval Architecture in Zagreb is accredited laboratory for force and a holder of National standard for force in the Republic of Croatia. Reference force standard with measuring range 10 - 500 kN was installed in LIMS at the end of 2005 with the intent of continuous improvement of the metrology infrastructure of Croatia. The load is obtained hydraulically and the measuring system consists of double placed reference transducers with the nominal force 100 kN and 500 kN. Preliminary investigations have shown that the relative measurement uncertainty will be less than 5E-04. Further investigations are current. LIMS has planned to participate in the interlaboratory comparison between two more laboratories. Intercomparison will be done in measuring range 10 - 500 kN using two commercial force transducers of 100 kN and 500 kN nominal values. The best measurements capability (CMC) of the participating laboratories varies from 0,002percent to 0,05percent. The calibration of the force transducers will be carried out using the laboratories own calibration procedure, the relevant classification data, i.e. rotation effect, repeatability, hysteresis as described in DIN EN ISO 376. Intercomparison will increase the level of Croatian metrology thus providing further cooperative investigations in association with European and Global National laboratories for force.