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"Force calibration"

Article
Comparison of Direct and Indirect Measurement of Creep Uncertainty in the Calibration of Force Measuring Devices
Manrusces Enot, Jin-seok Jang, Yon-Kyu Park
J. Korean Soc. Precis. Eng. 2018;35(7):651-655.
Published online July 1, 2018
DOI: https://doi.org/10.7736/KSPE.2018.35.7.651
As per ISO376 : 2011, creep uncertainty can be measured directly or indirectly. In this regard, this paper seeks to provide a comparison between direct and indirect creeps computed from hysteresis. All computations for direct and indirect creeps were done using equations from ISO376 : 2011. Five force measuring devices were experimentally examined for this purpose. Results showed that the behaviors of direct and indirect creeps were quite different. The relative creep that was directly measured was constant. On the other hand, the relative creep that was indirectly estimated varied with the applying force. Therefore, the directly measured creep cannot be replaced by the indirect one. This paper proposes a method to use a representative value for indirect creep, as the maximum of the creep. For the force measuring devices that had good hysteresis characteristics, the directly and indirectly measured creeps were comparable. However, for the force measuring devices with poor hysteresis characteristics, the indirectly estimated creep was much higher than the directly measured creep. Therefore, it is highly recommended to measure the creep directly for the force measuring devices characterized by poor hysteresis.
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