BS EN ISO 14253-2:2011

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Concept of the iterative GUM method for estimation
   of uncertainty of measurement
6 Procedure for Uncertainty Management - PUMA
7 Sources of errors and uncertainty of measurement
8 Tools for the estimation of uncertainty components,
   standard uncertainty and expanded uncertainty
9 Practical estimation of uncertainty - Uncertainty
   budgeting with PUMA
10 Applications
Annex A (informative) - Example of uncertainty budgets -
        Calibration of a setting ring
Annex B (informative) - Example of uncertainty budgets -
        Design of a calibration hierarchy
Annex C (informative) - Example of uncertainty budgets -
        Measurement of roundness
Annex D (informative) - Relation to the GPS matrix model
Bibliography

Provides guidance on the implementation of the concept of the "Guide to the estimation of uncertainty in measurement" (in short GUM) to be applied in industry for the calibration of (measurement) standards and measuring equipment in the field of GPS and the measurement of workpiece GPS characteristics.

This part of ISO14253 gives guidance on the implementation of the concept of the “Guide to the estimation of uncertainty in measurement?? (in short GUM) to be applied in industry for the calibration of (measurement) standards and measuring equipment in the field of GPS and the measurement of workpiece GPS characteristics. The aim is to promote full information on how to achieve uncertainty statements and provide the basis for international comparison of measurement results and their uncertainties (relationship between purchaser and supplier).

This part of ISO14253 is intended to support ISO14253-1. Both parts are beneficial to all technical functions in a company in the interpretation of GPS specifications [i.e. tolerances of workpiece characteristics and values of maximum permissible errors (MPEs) for metrological characteristics of measuring equipment].

This part of ISO14253 introduces the Procedure for Uncertainty MAnagement (PUMA), which is a practical, iterative procedure based on the GUM for estimating uncertainty of measurement without changing the basic concepts of the GUM. It is intended to be used generally for estimating uncertainty of measurement and giving statements of uncertainty for:

• single measurement results;

• the comparison of two or more measurement results;

• the comparison of measurement results — from one or more workpieces or pieces of measurement equipment — with given specifications [i.e. maximum permissible errors (MPEs) for a metrological characteristic of a measurement instrument or measurement standard, and tolerance limits for a workpiece characteristic, etc.], for proving conformance or non-conformance with the specification.

The iterative method is based basically on an upper bound strategy, i.e. overestimation of the uncertainty at all levels, but the iterations control the amount of overestimation. Intentional overestimation — and not underestimation — is necessary to prevent wrong decisions based on measurement results. The amount of overestimation is controlled by economical evaluation of the situation.

The iterative method is a tool to maximize profit and minimize cost in the metrological activities of a company. The iterative method/procedure is economically self-adjusting and is also a tool to change/reduce existing uncertainty in measurement with the aim of reducing cost in metrology (manufacture). The iterative method makes it possible to compromise between risk, effort and cost in uncertainty estimation and budgeting.