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  • Decision Rules, TAR, and TUR - Mitutoyo
    The TUR is most useful in selecting calibration providers, as ISO IEC 17025 accreditation forces all laboratories to evaluate and document uncertainty The TAR is quite useful in selecting new measuring equipment
  • Understanding Test Uncertainty Ratio (TUR)
    The comparison between the accuracy of the UUT and the estimated calibration uncertainty is known as a Test Uncertainty Ratio (TUR) This ratio is more reliable because it accounts for possible sources of error in the calibration process that the TAR does not Also important is the selection of the test points
  • Measurement Decision Risk - The Importance of Definitions
    Discuss how the Z540 3 definition of TUR is linked to measurement decision risk and the limitations of its use Review an example of the application of TUR in an off-nominal case and the corresponding calculation of measurement decision risk A look at the origin of the TUR TAR helps in understanding their relationship to measurement decision risk
  • TAR vs. TUR - Dimensional Gauge
    TUR = Test Uncertainty Ratio is the ratio between the accuracy tolerance of the UUT and the uncertainty of the calibrator either as a source or measuring instrument A MU is a result of combining a lab’s Calibration Measurement Capabilities (k=2, 95% probability) and Measurement Uncertainty (MU)
  • Appendix A - An Introduction to Frequency Calibrations . . . - NIST
    In order to perform the calibration, the DUT must be compared to a standard or reference The standard should outperform the DUT by a specified ratio in order for the calibration to be valid This ratio is called the test uncertainty ratio (TUR) A TUR of 10:1 is preferred, but not always possible
  • calibrate White Paper - Transcat
    The comparison between the accuracy of the UUT and the estimated calibration uncertainty is known as a Test Uncertainty Ratio (TUR) This ratio is more reliable because it accounts for possible sources of error in the calibration process that the TAR does not Also important is the selection of the test points
  • Metrology Concepts - Transcat
    TUR is the ratio of your instrument’s accuracy against the laboratory’s measurement uncertainty Uncertainty estimates are required under ISO-17025 accreditation practices in order for a lab to become accredited TUR is, therefore, a more correct ratio indicator of the calibration process 2





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