• There are no items in your cart
We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
Dismiss alert

BS ISO 21748:2017

Current
Current

The latest, up-to-date edition.

Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

10-07-2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principles
6 Evaluating uncertainty using repeatability,
   reproducibility and trueness estimates
7 Establishing the relevance of method performance
   data to measurement results from a particular
   measurement process
8 Establishing relevance to the test item
9 Additional factors
10 General expression for combined standard
   uncertainty
11 Uncertainty budgets based on collaborative study
   data
12 Evaluation of uncertainty for a combined result
13 Expression of uncertainty information
14 Comparison of method performance figures and
   uncertainty data
Annex A (informative) - Approaches to uncertainty
        evaluation
Annex B (informative) - Experimental uncertainty
        evaluation
Annex C (informative) - Examples of uncertainty
        calculations
Bibliography

Provides guidance for: - evaluation of measurement uncertainties using data obtained from studies conducted in accordance with ISO 5725-2, and - comparison of collaborative study results with measurement uncertainty (MU) obtained using formal principles of uncertainty propagation.

This document gives guidance for

  • evaluation of measurement uncertainties using data obtained from studies conducted in accordance with ISO5725‑2, and

  • comparison of collaborative study results with measurement uncertainty(MU) obtained using formal principles of uncertainty propagation (see Clause14).

ISO5725‑3 provides additional models for studies of intermediate precision. However, while the same general approach may be applied to the use of such extended models, uncertainty evaluation using these models is not incorporated in this document.

This document is applicable to all measurement and test fields where an uncertainty associated with a result has to be determined.

This document does not describe the application of repeatability data in the absence of reproducibility data.

This document assumes that recognized, non-negligible systematic effects are corrected, either by applying a numerical correction as part of the method of measurement, or by investigation and removal of the cause of the effect.

The recommendations in this document are primarily for guidance. It is recognized that while the recommendations presented do form a valid approach to the evaluation of uncertainty for many purposes, it is also possible to adopt other suitable approaches.

In general, references to measurement results, methods and processes in this document are normally understood to apply also to testing results, methods and processes.

Committee
SS/6
DevelopmentNote
Supersedes DD ISO/TS 21748 & 09/30191982 DC. (11/2010)
DocumentType
Standard
Pages
52
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 21748:2017 Identical

ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
ISO Guide 33:2015 Reference materials Good practice in using reference materials
FD X07 021 : 99 FD FUNDAMENTAL STANDARDS - METROLOGY AND APPLICATION OF THE STATISTICS - HELP TO THE PROCESS FOR THE ESTIMATION AND THE USE OF THE MEASUREMENT AND TEST RESULTS UNCERTAINTY
ISO 10576-1:2003 Statistical methods — Guidelines for the evaluation of conformity with specified requirements — Part 1: General principles
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results Part 4: Basic methods for the determination of the trueness of a standard measurement method
ISO/IEC Guide 99:2007 International vocabulary of metrology Basic and general concepts and associated terms (VIM)
ISO 3534-2:2006 Statistics Vocabulary and symbols Part 2: Applied statistics
ISO/IEC 17043:2010 Conformity assessment — General requirements for proficiency testing
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 7870-4:2011 Control charts Part 4: Cumulative sum charts
ISO 3534-3:2013 Statistics — Vocabulary and symbols — Part 3: Design of experiments
ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results — Part 5: Alternative methods for the determination of the precision of a standard measurement method
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
ISO 3534-1:2006 Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability

View more information
£260.00
Excluding VAT

Access your standards online with a subscription

Features

  • Simple online access to standards, technical information and regulations.

  • Critical updates of standards and customisable alerts and notifications.

  • Multi-user online standards collection: secure, flexible and cost effective.