Traceability of Bridge Amplifiers in Tared Measurement Applications
Abstract
The influence of the primary voltage ratio standard uncertainty on strain gauge measurements, especially at secondary levels like torque wrench calibration, is discussed. A method is presented to overcome its 1/x behaviour, which affects the uncertainty budget at lower ratios for the usual point-by-point transfer of uncertainty. <BR />Monte Carlo simulations of fitted correction values reduce the relative expanded contribution of the traceability uncertainty to less than 1 · 10<sup>-5</sup> for tared measurements with bridge amplifiers in comparison to five times more for point-by-point traceability. <BR />Considering typical further uncertainty contributions, a tared measurement of voltage ratios is possible with a combined relative expanded uncertainty of less than 1.8 · 10<sup>-5</sup>.
Event details
- Event
- tc3-2017