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Traceability of Bridge Amplifiers in Tared Measurement Applications

A. Brüge
  • 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.
    Monte Carlo simulations of fitted correction values reduce the relative expanded contribution of the traceability uncertainty to less than 1 · 10-5 for tared measurements with bridge amplifiers in comparison to five times more for point-by-point traceability.
    Considering typical further uncertainty contributions, a tared measurement of voltage ratios is possible with a combined relative expanded uncertainty of less than 1.8 · 10-5.
  • Keywords:
    voltage ratio, traceability, bridge amplifier, uncertainty, linearity
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  • DOI:
    _unreg_tc3-2017.027

Event details:

  • IMEKO TC:
    TC3
  • Event name:
    TC3 Conference 2017 - Measurement facing new challenges!
  • Title:

    23rd Conference on the Measurement of Force, Mass and Torque (together with 4th TC22 Conference on Vibration Measurement and 13th TC5 Conference on the Measurement of Hardness)

  • Place:
    Helsinki, FINLAND
  • Time:
    30 May 2017 - 1 June 2017