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BS ISO 21748:2017 – TC:2020 Edition

BS ISO 21748:2017 – TC:2020 Edition

$258.95

Tracked Changes. Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation

Published By Publication Date Number of Pages
BSI 2020 102
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PDF Catalog

PDF Pages PDF Title
52 National foreword
57 Foreword
59 Introduction
61 1 Scope
2 Normative references
3 Terms and definitions
65 4 Symbols
67 5 Principles
5.1 Individual results and measurement process performance
5.2 Applicability of reproducibility data
68 5.3 Basic equations for the statistical model
69 5.4 Repeatability data
6 Evaluating uncertainty using repeatability, reproducibility and trueness estimates
6.1 Procedure for evaluating measurement uncertainty
70 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
73 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
74 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
75 8.5.2 Changes in other contributions to uncertainty
9 Additional factors
76 10 General expression for combined standard uncertainty
11 Uncertainty budgets based on collaborative study data
78 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
79 14 Comparison of method performance figures and uncertainty data
14.1 Basic assumptions for comparison
14.2 Comparison procedure
80 14.3 Reasons for differences
81 Annex A (informative) Approaches to uncertainty evaluation
86 Annex B (informative) Experimental uncertainty evaluation
87 Annex C (informative) Examples of uncertainty calculations
97 Bibliography

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BS ISO 21748:2017 - TC
$258.95