Metrological characterization of the new 1 MN force standard machine of NPL India

摘要

Since November 2010, NPL India's force scale has been complemented in the range from 10 kN to 1 MN by a further force standard machine. This automatically working 1 MN force standard machine utilizes a lever amplification of a 100 kN mass stack and enables low relative expanded uncertainties of smaller than 9 X 10~(-5) on the lever, and 2 X 10~(-5) on the deadweight side. In this paper, the constructional design of the machine is described. According to the new EURAMET Calibration Guide, a model for the uncertainties is developed. Supplementary to this, results from comparison measurements of the new NPL India machine with PTBs force standard machines are presented.