INTRODUCTION FOR MEASUREMENT UNCERTAINTY

Measurement uncertainty describes a region about an observed value of a physical quantity which is likely to enclose the true value of that quantity. Reporting measurement uncertainty is compulsory for ISO/IEC 17025 accredited calibration and testing laboratories. This will also help the lab to further decide on decision rule requirements when applied by the labs to their respective results or when required by the customer or when the lab outsourced their measurement to an external lab.

This training module is designed based on the Guide to the Expression of Uncertainty in Measurement (GEUM) document published by BIPM. Participants are guided through a series of hands on practice, conduct experiments, collect data and perform calculation, learning from the simplest example of expressing uncertainty to complex multiple unit models.

LEARNING OUTCOME

• Understand the concept and its application.
• Apply the knowledge in testing and calibration laboratories measurements

METHODOLOGY

Lecture with LCD aid, exercises.

COURSE CONTENT

1. Introduction to Measurement Uncertainty (MU)
   • Definition of MU
   • Measurement Types
   • Sources of Uncertainties
2. General MU Calculation
   • Basic Statistical Concepts used to Calculate MU
   • Evaluation of Uncertainties
   • Combining Uncertainties
   • Reporting Uncertainties
3. Common Uncertainties Calculation
   • Identify sources of Uncertainties
   • Quantifying Uncertainties
   • Statistical evaluation of Source
4. Combining Uncertainties
   • Root-sum-squared Method
   • Deciding on Confidence Interval/Coverage Factor
   • Determine the Degree of Freedom using Welch-Satterthwaite formula
   • Expanded MU calculation & Final reporting

WHO SHOULD ATTEND

Technicians, Metrologist, Engineers

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