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  1. TiffyEng

    Small OD Tube External UT Device

    Thanks a lot for the advice.
  2. TiffyEng

    Small OD Tube External UT Device

    Hi thanks for the reply. Is there anything special about the transducer for this kind of application or are they just a smaller diameter?
  3. TiffyEng

    Small OD Tube External UT Device

    Can anybody suggest some good UT devices / methods for measuring wall thickness of tube externally in the range 1/4" OD to 1" OD? Thanks
  4. TiffyEng

    Calibration Uncertainty

    Assuming that the calibration is in tolerance (error bars less than the blue tolerance lines). Would the example method below for determining uncertainty of the device at calibration be appropriate? I assume the calibration tolerance +/-2% is a rectangular probability distribution and therefore...
  5. TiffyEng

    Calibration Uncertainty

    Hi thanks for replying. I am familiar with the usual Test Uncertainty Ratio of 4:1. In the example I attached, the error bars representing calibration uncertainty are much smaller in magnitude compared to the calibration tolerance of the UUT. It's not quite clear from the image but I suspect 4:1...
  6. TiffyEng

    Calibration Uncertainty

    I'm researching uncertainty calculations based on the GUM method. I have a question about estimating the standard uncertainty of an instrument based on it's calibration. In the examples I have seen, a manufacturer will quote a certain reference accuracy and state the statistical significance...

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