LOAD DEPENDENCY OF THE MOMENT-ARM LENGTH IN THE TORQUE STANDARD MACHINE

Koji Ohgushi, Takashi Ota, Kazunaga Ueda, Diedert Peschel, Thomas Bruns

Abstract

The deadweight loading dependency of the moment-arm length in the torque standard machine (TSM) at NMIJ was suspected of causing deviation in the Interlaboratories Comparison between PTB and NMIJ. The authors attempted to re-verify the moment-arm length and to improve the uncertainty of the arm length in the TSM. Metal bands (MBs) are used for the loading point (called "Reference Line") at both ends of the arm. In an arm balancing test, displacement of the MBs in the arm length direction was measured by eddy current type non-contact sensors during deadweight loading. Additional initial weights mounted just under the MBs effectively reduced the load-dependency of the arm length from 52 ppm to 24 ppm.

Keywords

Torque, Load Dependency, Arm Length

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PWC-2003-TC3-029.pdf

DOI

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IMEKO TC

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

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