A torque key comparison coded CCM.T-K1.3 was conducted at the torques of 0 N m, 500 N m and 1000 N m as an extension of the key comparison CCM.T-K1 between two laboratories, Korea Research Institute of Science and Standards (KRISS) and National Institute of Standard (NIS) in Egypt. KRISS, who joined CCM.T-K1 key comparison in 2005, piloted this comparison and played a role of a link laboratory. Comparison results show that NIS torques at 0 N m, 500 N m, and 1000 N m are equivalent to KCRVs of CCM.T-K1.
Main text.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Misalignment of torque calibration machines can cause parasitic bending loads inside the torque transducers in use. These parasitic loads may affect the machine uncertainty, specially for secondary torque calibration machines. Therefore, this study discusses the contribution of misalignment to the measurement uncertainty for a newly designed 3 kNm secondary vertical torque calibration machine. Radial axes shift up to 4 mm was applied which introduce small increased uncertainty.
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