Expansion of the calibration range and improvement of the uncertainty in the 1 kN·m deadweight torque standard machine

K. Ohgushi, A. Nishino, T. OTA, K. Ueda

Abstract

Expansion of the calibration range and improvement of the uncertainty of realized torque in the 1 kN·m deadweight torque standard machine were investigated. The lower limit of the calibration range was lowered from 5 N·m to 0.5 N·m by developing new small linkage weight series. In addition, the sensitivity limit at the fulcrum was reevaluated. The moment-arm length was also re-measured after changing the thin metal bands at the ends of the moment-arm. As a result of these evaluations, relative expanded uncertainties (k = 2) of 7.3 × 10^-5 and 2.9 × 10^-5 could be obtained in the range from 0.5 N·m to 20 N·m and from 5 N·m to 1 kN·m, respectively.

Keywords

torque, sensitivity limit, deadweight

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IMEKO-TC3-2007-099u.pdf

DOI

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IMEKO TC

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

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