Establishment of a 10 kN Dead Weight Force Machine at NPL, India

摘要

This paper describes the preliminary results of the performance of the newly developed 10 kN dead weight force machine at the National Physical Laboratory, India that would serve as national reference force standard with an expanded uncertainty lower than 30 ppm. Two well-characterized strain gauge transfer force standards of 5 kN and 10 kN full scale, having an uncertainty of 0.02% in the measured forces and repeatability better than 0.002% were calibrated in the machine. The observed results were analyzed with particular reference to repeatability, hysteresis, machine interaction etc that are well below the stated uncertainty.