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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Identify the measured quantity and the uncertainty components
   • Specify an equation for the measurement
2. List uncertainty components that are associated with each input in the equation
3. Determine the size of each uncertainty component
   • Calculate the standard deviations and standard deviation of the mean from the measurement results
4. Use calibration reports, manufacturer's specifications, quality control and validation data, and experimental data to collect other available information on the uncertainty components
5. Reduce each uncertainty component to a standard uncertainty
   • Allocate an appropriate distribution for each uncertainty component
6. Calculate the standard uncertainties
7. Calculate an expanded uncertainty to the required confidence level
   • Calculate the sensitivity coefficient for each uncertainty component
8. Calculate a combined standard uncertainty
9. Determine an appropriate coverage factor based on the degrees of freedom associated with each uncertainty component
10. Calculate the expanded uncertainty
11. Report the expanded uncertainty
    • Report the result and uncertainty to an appropriate number of significant figures
12. Report the confidence level and coverage factor
13. Determine the appropriateness of the size of the expanded uncertainty relative to the tolerance or required accuracy of the test
14. Determine the fitness for purpose of the expanded uncertainty relative to the use of the measurement result