RENOVATION OF NMIJ'S 54 kN DEAD-WEIGHT FORCE STANDARD MACHINE INTO 100 kN MACHINE

Toshiyuki Hayashi, Yoshihisa Katase, Hiroshi Maejima,Yukio Yamaguchi, Kazunaga Ueda

Abstract

NMIJ's 54 kN dead-weight force standard machine (DWM) has been upgraded to a 100 kN DWM by replacing the old weights with newly designed ones. There are four major improvements: extending the capacity from 54 kN to 100 kN, realizing calibration forces in Newtons, enabling 8- or 10-step calibrations for 50 kN and 100 kN ranges, and reducing maintenance work by motorizing the weight lifting mechanism. The calibration capability of the renovated DWM was confirmed to be better than 2.0 × 10^−5 in terms of relative expanded uncertainty when calibrating some of the best force transducers available on the market.

Keywords

force standard, SI unit of force, subdivision of force steps, motorization, DWM

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IMEKO-WC-2012-TC3-P10.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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