©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 38
u
2
- uncertainty due to the
calibrator inaccuracy
u
2
is the ±1 sigma estimate of the calibrator error,
• (estimates a ±1 standard deviation coverage of
the errors - for 68% of all possible values),
• based on the specifications for performance at the
specific test setting
− Start with the manufacturer’s recommended specifications
at the test point
− Adjust as required for any appropriate factors such as
legal traceability limitations, improvements for output
characterizations, etc.
− Convert to a ± one sigma confidence interval basis
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