A Comparative Verification of Force Calibration Machines Used by an Accredited Laboratory

− One of the most important activities of the National Accreditation Body (NAB) is the organisation of a series of comparisons (ILC), at the National level, to verify the measurements capability of the accredited laboratories For evaluation of the best measurement capability of AEP Transducers -an calibration accredited laboratory for Force quantity over several years (1999-2005) are carried out measurements during accreditation and reaccreditation process of this SIT Centre, whose main results are reported in the following. The results were evaluated using the En normalised error according to the SIT Doc-511. The metrological procedures applied and the results of the accreditation of the SIT Centre, show that the best measurement capabilities and the total uncertainty, including transfer standards contribution and long term stability, can be considered as well: ± 50 ppm for the 50 kN dead weight machine (DWM); ± 250 ppm for the 200 kN Comparison machine; ± 350 ppm for the 1 MN Comparison machine (compression) ± 250 ppm for the 1 MN Comparison machine (tension).