Performance Evaluation of New 1 MN Force Standard Machine Established at NPL(I)

A new 1 MN force standard machine using dead weight force up to 100 kN and lever multiplication of dead weight force up to 1000 kN has recently been installed at NPL (I). The metrological performance of the machine including the uncertainty of the force realized and its relative deviation from the force values measured by precision force transfer standards calibrated in the PTB force standard machine of equivalent uncertainty has been evaluated. The measurement results affirm the estimated uncertainty of the force realized, which is within ±20 ppm on the dead weight side and within ±90 ppm on the lever side. The construction and operational mechanism are described and the measurement results are reported in this paper.