Calibration of Force Standard Machine by Build-up Force Transfer System in the Highest Range Up To 60 MN

Abstract

There is an increasing demand for the large-scale force standard machine with a capacity higher than 20 MN. In this paper, the calibration method and procedure were developed according to a proposed traceability route and used to calibrate a 60 MN force standard machine. One 7.5 MN and six 20 MN force transducers and two 60 MN build-up systems were used as the force transfer standards. Uncertainty models of the build-up system and force standard machine were also developed. The calibration results show that it is possible to calibrate a 60 MN build-up force standard machine with a relative expanded measurement uncertainty smaller than 0.035% (k = 2) by two build-up systems, which were compared with themselves. The 60 MN build-up system, which worked as the force transfer standard, should be calibrated to confirm its systematic error and corrected by the error. Its uncertainty also could be estimated independently by the developed model.