Tiêu đề TP 7.6 Evaluation of measurement of uncertainty Procedure.pdf ✅

Evaluation of Measurement uncertainty Conformity assurance Electrical lab – Dammam Issue date: 01.04.2024 V: 01 Code: TP-7.6 controlled E copy Evaluation of Measurement uncertainty procedure TP-7.6 Author Prepared by Reviewed and approved by Name Mohamed Abdelaziz Shaik aldien Function /position Quality Lead / Senior Quality Supervisor lab Manager Signature Date All rights reserved. These materials are confidential and proprietary to Conformity Assurance. No part of these materials should be reproduced, published in any form by any means (electronic or mechanical, including photocopy or any information storage or retrieval system), nor should the materials be disclosed to third parties without the express written authorization of Conformity Assurance
Evaluation of Measurement uncertainty Conformity assurance Electrical lab – Dammam Issue date: 01.04.2024 V: 01 Code: TP-7.6 controlled E copy 1. Purpose This document describes and outlines steps for evaluation of uncertainty measurement. 2. Scope This procedure covers all test methods and results for Conformity Assurance laboratory “ceramic and water consumption “and specific test methods. 3. Definitions/abbreviation 3.1. Reliability the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. 3.2. Repeatability Repeatability or test–retest reliability is the closeness of the agreement between the results of successive measurements of the same measure, when carried out under the same conditions of measurement. 3.3. Reproducibility the extent to which consistent results are obtained when an experiment is repeated 3.4. decision rule rule that describes how measurement uncertainty is accounted for when stating conformity with a specified requirement 4. Standards/References 4.1. ISO/IEC Guide 98-3: 1995 Uncertainty of measurement —Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) 4.2. ISO 21748 :2017 Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation 5. Responsibilities - Lab Analyst - Technical manager 6. Process 6.1. Identification and documentation of the measurement uncertainty is required by conformity Assurance laboratory. Additionally, each laboratory is required to list all the components of uncertainty and estimate the uncertainty for all methods or technologies on their scope of accreditation.
Evaluation of Measurement uncertainty Conformity assurance Electrical lab – Dammam Issue date: 01.04.2024 V: 01 Code: TP-7.6 controlled E copy 6.2. Estimating the uncertainty 6.2.1. the measurement uncertainty is estimated using relative standard deviation of the lab. control samples run through all method steps. Measurement uncertainty does not usually include uncertainty due to sampling. 6.3. Technical Manager Below Factors those may affect evaluation of measurement uncertainty (Guideline) 6.3.1. Factor related equipment’s / Measuring apparatus 6.3.2. Factor related to personal 6.3.3. Factors related to reference material and certified reference material 6.3.4. Factors related to Environmental Conditions 6.3.5. Combine all factors and all parameters that could affect uncertainty of the test method. then take the square root of the sum. This is called the root sum square method and gives the combined standard uncertainty. Combined uncertainty (Uc) = √ factors affecting uncertainty Eqn. 1 6.3.6. Expand the combined standard uncertainty using the following equation: Expanded uncertainty (Uexp) = k X (Uc) Eqn. 2 Where k is the coverage factor. The coverage factor is the number that is multiplied by the combined uncertainty (or standard uncertainty, if there is only one component), to produce an uncertainty estimate that will contain a large fraction of all values that might be obtained on a test. The coverage factor is commonly noted as k, and k=2 is used for 95% coverage, and k=3 for 99% coverage. 6.3.7. The test results are reported associated with the expanded Uncertainty as follows: Test Result = C ± Expanded Uncertainty Eqn.5 Where C = test result obtained Note : The type of the uncertainty will be mentioned within the test report 6.3.8. The extent of reporting of the estimates of uncertainty depends on the needs of the client, the specifications for the test, and the intended use of the result. There is no need to report the estimate if it is not desired by the client or not needed for other reasons. 6.3.9. If reported, the uncertainty is reported to the same number of significant figures as the result. In most cases, two significant figures suffice. The estimate should also state the level of confidence
Evaluation of Measurement uncertainty Conformity assurance Electrical lab – Dammam Issue date: 01.04.2024 V: 01 Code: TP-7.6 controlled E copy associated with the coverage factor. Finally, the uncertainty is reported in the same units as the result. 7. Process flow chart NA 8. Forms / template N/A 9. Revision history The following list provides a key-word-based overview of the changes made to this QM document over time. SN Issue No. Revision No. Date Change Training 1. 1.0 0.0 01-04-2024 Initial issue Done