FORCE NATIONAL STANDARDS COMPARISON BETWEEN CENAM/MEXICO AND NIM/CHINA

Abstract: This paper presents the results of a force comparison between CENAM/Mexico, with a 150 kN dead weight machine (DWM), and NIM/China, with a 100 kN DWM. The procedures to calculate the uncertainty of the output of a calibrated force transducer and the relative difference uncertainty between two DWM, in compliance to ISO GUM 1995, are here included. Agreement of the force standards between China and Mexico is within 2E-5 relative to the reading. Uncertainty of the measurements made by both machines can be as good as 1E-5 relative to the reading as long as a good load cell is tested