Poids-étalons en acier Réalisation et étalonnage

Abstract

In this work, we fabricated a set of steel weights (C50) of (1g, 2g, 2g*, 5g, 10g, 20g, 20g*, 50g, 100g, 200g, 200g*) in accordance with the requirements specified by Recommendation R111 of the International Organization of Legal Metrology to ensure the accuracy and quality of standard weights. The weights produced are cylindrical in shape, and the material was chosen based on its mechanical properties such as hardness and strength to withstand corrosion, aiming to achieve standard weights with uncertainties close to the nominal values. For their adjustment, we added lead to the cavities of weights from 100g to 200g and performed polishing operations on the remaining weights. Finally, to determine the accuracy class of these standard weights, we conducted calibration using conventional mass calculations and expanded uncertainties for each weight. The results obtained classify the weights (1g, 2g, 2g*, 20g, 50g, 100g, 200g, 200g*) in accuracy class M_2 and the weights (5g, 10g, 20g*) in accuracy classM_3.