Abstract
The INRiM 1 MN deadweight force standard machine (DFSM) was installed in 1995. It adopts a binary sequence of ten weights whose combinations generate forces up to 1 MN. The advantage of this system lies in the self-calibration of its weights. The procedure is based on the comparison between two forces generated by a single weight and by a group of smaller weights, nominally equal. After 25 years, a verification of the DFSM was performed. Results are within the declared CMC limits, i.e. a relative expanded uncertainty of 2 × 10<sup>-5</sup>.
Highlights
Back in 1995, the advancement of technology and available resources allowed to design and install the 1 MN deadweight force standard machine (DFSM) at INRiM [1, 2]
SELF-CALIBRATION PROCEDURE The self-calibration method is based on the comparison between two nominally equal forces alternatively generated by a single weight and by an equivalent group of smaller weights [5]
The verification of the INRiM 1 MN deadweight force standard machine was performed with a selfcalibration procedure
Summary
Back in 1995, the advancement of technology and available resources allowed to design and install the 1 MN DFSM at INRiM [1, 2]. The machine is able to generate known forces and is generally used as a reference for the calibration or verification of force transducers and load cells. The DFSM has a declared CMC with a relative expanded uncertainty of 2 × 10-5 [3]. Twenty-five years after the installation, despite several positive international comparisons, it was necessary to carry out a verification of the machine. For this purpose, a self-calibration method was developed. This paper deals with the description of the self-calibration method and the analysis of experimental results
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