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

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 × 10−5 on the lever, and 2 × 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 PTB´s force standard machines are presented.

► Amplificated force standard machine with an uncertainty lower 0.01%.
► Unique widespread range of the single force standard machine between 1 kN and 1 MN.
► Uncertainty model for an amplificated force standard machine according to the new ISO 376.
► Low uncertainties demonstrated in a comparison between PTB(Germany) and NPL(India).