Establishment of torque standards in KRISS of Korea

Park Yon-Kyu, K. Min-Seok, K. Jong-Ho, C. Jae-Hyuk, K. Dae-Im

Abstract

Korea Research Institute of Standards and Science(KRISS) has developed a 100 N·m and a 2 kN·m deadweight torque standard machines. The 100 N·m torque machine can generate torque from 0.1 N·m to 110 N·m. The length of its torque arm is 0.25 m for both sides. It uses continuous deadweight stack. At each side, it has three different deadweight stacks. By rotating the base plate on which the deadweight stacks are located, the machine can adjust a suitable deadweight stack of appropriate torque range. Its relative uncertainty is 5 × 10^-4 from 0.1 N·m to 1 N·m and 5 × 10^-5 from 1 N·m to 110 N·m. The 2 kN·m deadweight torque machine uses a continuous deadweight stack at the left side and a binary type combination deadweight stack at the right side. By combining both deadweight stacks, the machine can generate torque from 10 N·m to 2200 N·m for both clockwise and counter-clockwise directions. The machine fixes its torque arm when changing the torque to maintain previous torque level. Its relative expanded uncertainty is 5 × 10^-5.

Keywords

torque, torque standard machine, uncertainty, intercomparison

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IMEKO-TC3-2007-102u.pdf

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IMEKO TC

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

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