DEVELOPMENT AND METROLOGICAL CHARACTERIZATION OF A 1000 N·m TORQUE COMPARATOR MACHINE FOR CALIBRATING TORQUE WRENCH TESTERS

S. S. K.Titus, S. K. Jain

Abstract

The National Physical Laboratory, India NPL(I) has established torque scale up to 2000 N·m with calibration and measurement capability up to 0.01%, which has demonstrated a degree of equivalence in the BIPM CCM-T.K.1.1 key comparison. A torque comparator machine has been designed and developed at NPL, India for providing the national traceability of torque scale to the users without much degradation in the accuracy of measurement for certain industrial applications. This paper describes the salient features of the machine and the performance evaluation of the machine up to 1000 N·m. The expanded uncertainty associated with torque generated by this machine is found to be within ± 0.1% which is adequate for performing the calibration of industrial type torque wrench testers.

Keywords

torque standards, comparison calibration, measurement uncertainty

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IMEKO TC

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

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