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The role of uncertainty of measurement in conformance testing

The role of uncertainty of measurement in conformance testing. Steve Sidney Steve Sidney Consulting. Introduction Tolerance limits and intervals Acceptance limits Knowledge of the measurand Probability of conformance Consumer / producer risks Summary. Introduction

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The role of uncertainty of measurement in conformance testing

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  1. The role of uncertainty of measurement in conformance testing Steve Sidney Steve Sidney Consulting

  2. Introduction • Tolerance limits and intervals • Acceptance limits • Knowledge of the measurand • Probability of conformance • Consumer / producer risks • Summary

  3. Introduction • What is conformity assessment • Inspection • Role of measurement • UoM • Probability • Decide if item conforms to specified requirement • Risk

  4. Intervals and Limits

  5. Probability & UoM

  6. Knowledge of Measurand – GUM • Conditional PDF • Poor knowledge – broad PDF • Measurements sharpen PDF • Measurement effectively updates pre-measurement (prior), yielding post measurement (posterior) & includes measurement data. • Bayes theorem (conditional probability)

  7. Decisions to be made • Accept item • Reject item • Perform another measurement

  8. Consumer / Producer Risk • Valid Acceptance • False Acceptance • Valid Rejection • False Rejection

  9. Probability of conformance

  10. Risk False Rejection False Acceptance Valid Acceptance Valid Rejection Limit

  11. Summary • Importance of UoM • Guidelines BIPM JCGM 106 (Evaluation of measurement data – The role of MU in CA) http://www.bipm.org

  12. Thank you

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