Force transducers are calibrated using dead-weight, lever multiplication or hydraulic multiplication standard machines. For very large capacities, in general above 1 MN, the "buildup" method may be employed, consisting of comparing the dynamometer to be calibrated with one or more dynamometers linked in parallel. With the "build-up" method the field of force measurement may be extended to values that would not appear possible with the use of deadweight or multiplication primary standards, at a much lower cost. The present paper reports the evolution over time, that is the long term stability of the metrological characteristics (calibration factors, repeatability, hysteresis and zero variations at no load) of two reference transducers (3 MN and 9 MN respectively) used to calibrate force transducers at IMGC-CNR.
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