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eLibrary > BS ISO 21748:2017 - TC Tracked Changes. Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation >

BS ISO 21748:2017 - TC Tracked Changes. Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation, 2020

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BS ISO 21748:2017 - TC Tracked Changes. Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation, 2020

30344873_NEW.pdf [Go to Page]
National foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principles
5.1 Individual results and measurement process performance
5.2 Applicability of reproducibility data
5.3 Basic equations for the statistical model
5.4 Repeatability data
6 Evaluating uncertainty using repeatability, reproducibility and trueness estimates
6.1 Procedure for evaluating measurement uncertainty
6.2 Differences between expected and actual precision
7 Establishing the relevance of method performance data to measurement results from a particular measurement process
7.1 General
7.2 Demonstrating control of the laboratory component of bias
7.2.1 General requirements
7.2.2 Methods of demonstrating control of the laboratory component of bias
7.2.3 Detection of significant laboratory component of bias
7.3 Verification of repeatability
7.4 Continued verification of performance
8 Establishing relevance to the test item
8.1 General
8.2 Sampling
8.2.1 Inclusion of sampling process
8.2.2 Inhomogeneity
8.3 Sample preparation and pre-treatment
8.4 Changes in test-item type
8.5 Variation of uncertainty with level of response
8.5.1 Adjusting sR
8.5.2 Changes in other contributions to uncertainty
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
13.1 General expression
13.2 Choice of coverage factor
13.2.1 General
13.2.2 Level of confidence desired
13.2.3 Degrees of freedom associated with the estimate
14 Comparison of method performance figures and uncertainty data
14.1 Basic assumptions for comparison
14.2 Comparison procedure
14.3 Reasons for differences
Annex A (informative) Approaches to uncertainty evaluation
Annex B (informative) Experimental uncertainty evaluation
Annex C (informative) Examples of uncertainty calculations
Bibliography [Go to Page]

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