Abstract
Torque primary standard machines are established at CSIR-NPL, India to realize the torque scale and to disseminate the same for user industries for providing the traceability in torque measurement. Two torque machines, a primary standard machine comprising of elastic hinge supported load lever with scale pan having an uncertainty of ±0.01 % and a secondary standard machine comprising of an unsupported lever arm with a scale pan suspended by a knife edge having an uncertainty of ±0.05 %, are established. The uncertainty of these machines are estimated theoretically by considering the uncertainty contributions of various input quantities which is also reaffirmed through the inter-comparison carried out on these machines.
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Acknowledgments
The authors would like to thank Prof. R.C.Budhani, Director, National Physical Laboratory for granting permission to publish the work. The authors are also thankful to Dr. K.K. Jain, former Head, Force and Hardness Standard, NPL for his valuable suggestions.
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Titus, S.S.K., Jain, S.K. Establishment and Development of Torque Metrology in CSIR-NPL for Providing the Traceability in Torque Measurements to User Industries. MAPAN 28, 11–16 (2013). https://doi.org/10.1007/s12647-012-0029-6
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DOI: https://doi.org/10.1007/s12647-012-0029-6