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Procedure · SOP-16

Evaluation of Measurement Uncertainty

GUM-based uncertainty evaluation, budgets, CMC consistency and reporting, aligned with UKAS M3003 principles.

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Purpose

To define how the Laboratory identifies, evaluates, combines, expands, reports and reviews measurement uncertainty for every calibration it performs, in accordance with the GUM and the principles of UKAS M3003 and ILAC-P14, and how the uncertainties claimed in the scope of accreditation (CMCs) are supported and applied.

What is inside

10 sections, about 5 pages when printed.

  1. 1. Purpose
  2. 2. Scope
  3. 3. References
  4. 4. Definitions
  5. 5. Responsibilities
  6. 6. Procedure
  7. Records generated by this procedure
  8. Monitoring and performance indicators
  9. Assessment readiness notes
  10. Related documents

Records it generates

Applying this procedure produces the following records, which are the evidence an assessor samples.

  • –Procedure uncertainty budgets with approval and review history
  • –Job-specific uncertainty evaluations
  • –CMC support evidence and consistency checks
  • –Calculator validation

What an assessor looks for

The document closes with these points, so you can check your own practice before someone else does.

  • –Working through a budget line by line with the engineer: where each number came from, why that distribution, what the sensitivity coefficient is, whether the dominant contribution is realistic.
  • –Checking that the environmental and drift contributions match the actual limits and the observed history.
  • –Comparing the CMC with the reference standard's certificate uncertainty and with routine job uncertainties.
  • –Asking the engineer (not only the Technical Manager) to explain the uncertainty on a certificate they produced.
  • –Checking the wording of the uncertainty statement and rounding on certificates.

Before you use it

  • Replace every square-bracket token, starting with [LABORATORY NAME], [ADDRESS] and [EFFECTIVE DATE]. The full token list is in GD-01 Read Me First.
  • Have the content technically reviewed against how your laboratory actually works, then approved by the responsible manager before it becomes a controlled document.
  • Update the Word fields after editing so the table of contents and page numbers are correct: select all, then press F9.
  • Record the document in your own document register and set its review date.
  • Delete the assessment readiness notes if you do not want them in your controlled version; they are guidance for you, not requirements.

Related documents

This is an original template published by ValiTrac. It does not reproduce the text of ISO/IEC 17025 or of any accreditation body publication, and it does not by itself confer or guarantee accreditation. Customise, review and approve it before use.