How can you prove that your Reference standard is more accurate than the UUT?

The accuracy of your standard should be higher than the UUT.

The most recommended accuracy ratio of standard and UUT is 4:1.

But how can you determine this?

One method that is used here is the TUR or Test Uncertainty Ratio. When the result is equal or greater than 4, it means that your reference standard is 4 times more accurate than the UUT, therefore; it is suitable to be used to calibrate the UUT (Unit Under Test). See the formula and example in the below photo.

I also presented in this article the following topics:

  1. The Difference Between  Accuracy and Error (Accuracy vs Error)

  2. The difference between Error and Uncertainty (Error vs Uncertainty)

  3. The Difference between Tolerance and Uncertainty (Tolerance vs Uncertainty)

  4. The relationships between Accuracy, Error, Tolerance, and Uncertainty in Calibration Results

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