©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 37
The ”B” type of uncertainties …
All the other uncertainties that cannot be determined statistically during
the measurement process, such as -
− Calibrator inaccuracy or error
− Measurement errors due to limitations of the DMM’s resolution
− lead effects, thermal emfs, loading, etc.
• Estimates here are based on scientific judgment using all relevant
information
• Numerically, these are expressed as one standard deviation
estimates for each different uncertainty
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