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FARO® Knowledge Base

Difference between 2 Sigma and Max Error in the Calibration View Log and Which Determines Calibration Pass or Fail

In the calibration view log, the max error is reporting the maximum deviation of all the points taken. The value reported by 2 sigma is twice the standard deviation of all the points taken while performing the calibration. 2 Sigma is used to determine whether the arm passes or fails calibration. The value of 2 sigma has to be less than the single point accuracy of the arm for it to pass calibration.

Keywords:

calibration, view log, 2 sigma, max error