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.
  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
• Download:

  IMEKO-TC3-2017-027.pdf
• DOI:

  _unreg_tc3-2017.027

Event details:

• IMEKO TC:

  TC3
• Event name:

  TC3 Conference 2017 - Measurement facing new challenges!
• Title:

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

• Place:

  Helsinki, FINLAND
• Time:

  30 May 2017 - 1 June 2017