Abstract
The older-generation dead-weight type force standard machines (DWMs) at the National Metrology Institute of Japan (NMIJ) were recently renovated with four aims: improving calibration uncertainty, enabling calibrations conforming to the latest standard, automating the calibration work, and reducing maintenance costs. Calibration uncertainties have been improved by removing eccentricity due to the incomplete tare balancing mechanism of the older 20kN DWM and by eliminating extrapolation of calibration forces from kgf to N in the 54kN DWM. Insufficient dead-weight division of the 54kN DWM has been reformed to enable 8-step calibrations, along with expansion of its capacity to 100kN. Working efficiency has been improved by automating dead-weight actuation and rotational position changes of force measuring instruments. Maintenance costs and labor have been reduced by electrifying the dead-weight actuation mechanism in the 54kN DWM.
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