©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 13
… about the sources of
uncertainty…
ISO 17025, Section 5.4.6.3:
− NOTE 1: Sources contributing to the uncertainty
include, but are not necessarily limited to,
• The reference standards and reference
materials used
• Methods and equipment used
• Environmental conditions
• Properties and condition of the item being
tested or calibrated
• Operator
There are many contributors to uncertainty