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Division 4.1.10 Measurement uncertainty

United Kingdom

Original text. Later amendments are not shown.

The part of the calculated measurement uncertainty UT,pum/tur exceeding 1 % of the measured torque Tc,pum/tur shall be used to correct the characteristic value of the TC as defined below.

ΔUT,pum/tur = MAX (0, (UT,pum/tur – 0,01 * Tc,pum/tur))

The uncertainty UT,pum/tur of the torque measurement shall be calculated based on the following parameter:

  1. (i)

    Calibration error (incl. sensitivity tolerance, linearity, hysteresis and repeatability)

The uncertainty UT,pum/tur of the torque measurement is based on the uncertainties of the sensors at 95 % confidence level.

  • UT,pum/tur = 2 * ucal

  • ucal=1×Wcalkcal×Tn

where:

Tc,pum/tur

  • Current / measured torque value at input/output torque sensor (uncorrected) [Nm]

    • Tpum

  • Input (pump) torque (after uncertainty correction) [Nm]

    • UT,pum/tur

  • Uncertainty of input / output torque measurement at 95 % confidence level separately for input and output torque sensor[Nm]

    • Tn

  • Nominal torque value of torque sensor [Nm]

    • ucal

  • Uncertainty by torque sensor calibration [Nm]

    • Wcal

  • Relative calibration uncertainty (related to nominal torque) [%]

    • kcal

  • Calibration advancement factor (if declared by sensor manufacturer, otherwise = 1)