PERFORMANCE OF THE NEW PRIMARY TORQUE STANDARD MACHINE OF INMETRO, BRAZIL |
|---|
| R. Oliveira, L. Cabral, U. Kolwinski, D. Schwind |
- Abstract:
- A new design of primary torque standard machines (TSM) with feedback-control of the lever support was described at IMEKO – XVI World Congress in Vienna [1]. The purpose of this paper is to present the performance of a hand operated option model in the wide range from 2 N·m up to 3000 N·m. Influences of hand operation are estimated as well as ambient influences like temperature changes and air flow. A protection chamber against the ambient influences was built and the improvement is shown. The TSM has three mass stacks to cover all transducer capacities from 20 N·m up to 3000 N·m in each ten steps. The masses are calibrated within 5·10-6 by German DKD. The lever arms were precisely adjusted and also DKD-calibrated within 5·10-6. The adjustment procedure is described. The measurement uncertainty is calculated by the design data according GUM. In addition the best measurement capability of the TSM and the relative deviations are calculated by the results of several torque transfer standards, former calibrated at PTB. Both calculations are compared. The next steps of the upgrade concept – from a hand-operated model to a full-automated model – are illuminated regarding the requirements in Brazil.
- Download:
- IMEKO-TC3-2005-069u.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC3
- Event name:
- Force, Mass and Torque Measurements
- Title:
- Theory and Applications in Laboratories and Industry
- Place:
- Cairo, EGYPT
- Time:
- 19 February 2005 - 23 February 2005