A Practical Handbook on Measurement Uncertainty: FAQs and fundamentals for metrologists

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Swanand Rishi (Department of Electronics and Information Technology Standardization Testing and Quality Certification Directorate, Government of India (India))

A Practical Handbook on Measurement Uncertainty

FAQs and fundamentals for metrologists

Swanand Rishi (Department of Electronics and Information Technology Standardization Testing and Quality Certification Directorate, Government of India (India))

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English

Institute of Physics Publishing
29 July 2024

Mensuration & systems of measurement; Engineering measurement & calibration

Series: IOP ebooks

In the field of metrology, measurement uncertainty has a special place of its own since “No measurement result is complete without explicit statement about its uncertainty”. Hence for all accredited laboratories, evaluation of measurement uncertainty is a mandatory requirement. The purpose of the book is to clarify the rationale behind certain assumptions or ideas in measurement uncertainty, present the concepts from practical perspective, help readers arrive at a realistic uncertainty figure and be a ready-reference hand-book. The book can serve as a quick reference book on basic concepts in measurement uncertainty. The book is written in a manner so that practicing metrologists can open any chapter and start reading. The topics covered are applicable across all fields of scientific measurements.

Key Features:

A ready-reference practical hand-book Clarifies the rationale behind certain assumptions or ideas Presents the concepts from practical perspectives Provides insight, examples and case studies Helps readers get answers to FAQs

By: Swanand Rishi (Department of Electronics and Information Technology Standardization Testing and Quality Certification Directorate Government of India (India))
Imprint: Institute of Physics Publishing
Country of Publication: United Kingdom
Dimensions: Height: 254mm, Width: 178mm, Spine: 13mm
Weight: 565g
ISBN: 9780750364584
ISBN 10: 0750364580
Series: IOP ebooks
Pages: 198
Publication Date: 29 July 2024
Audience: Professional and scholarly , Undergraduate
Format: Hardback
Publisher's Status: Active

Preface Abbreviations List of symbols PART A: Understanding Fundamentals Using Correct Terminology Why Do We Need to Estimate Uncertainty? Is It ‘Estimation’ or ‘Calculation’ Of Uncertainty? What Uncertainty Is Not? Various Error Terms and Bias GUM-The New Approach Law of Propagation of Uncertainty Why Standard Deviation is Used Instead of Variance? Using Pooled Standard Deviation Some Uncommon Uncertainties PART B: Dealing with Distributions The Normal, the “t” and the Standard Normal distribution Is Type A & Type B Synonymous with Random & Systematic? What about Reproducibility in Uncertainty Estimation? How Come We can Combine Different Distributions? Triangular and Trapezoidal Distributions: Guidelines for Selection Aren’t Higher Confidence Level and Larger Uncertainty Contradictory? Mind the Correlation Part C: Sample Size and Analysis Sampling Distributions The Sample Size Dilemma Sample Size - Another Approach What About Uncertainty with A Single Measurement? Part D: Decoding Degrees of Freedom Why Degrees of Freedom is n – 1 in Type A Method? Why Degrees of Freedom is Generally “∞” In Type B Method? Effective Degrees of Freedom – Some Considerations Part E: Some Contiguous Concepts What is The Significance of Sensitivity Coefficient? Dealing with Corrections TUR: Use Only as a Guiding Phenomenon Guarding the Compliance Decisions Part F: Delving a Little Deeper Treating Dominant Non-Gaussian Components Sample Analysis - “How Normal Is the Normal?” Sample Analysis-Detecting the Outliers Analyzing the Results Proper Reporting of Uncertainty The Alternative Approaches in Uncertainty Evaluation Some Important Notes in GUM Bibliography Some useful websites Appendix A

Swanand Rishi graduated in Electrical Engineering with Distinction in 1986, (with specialization in Power Electronics) from College of Engineering, Pune, India, and completed a Diploma in Business Management (DBM) with Gold medal in 1998. After graduation until 1995, Swanand worked in several manufacturing industries with products such as UPS/Power conditioners, Capacitors and Lightning Arrestors. In those companies, he served in various sections including Production, Quality, R&D, Testing and Marketing. He was instrumental in bringing down rejection of certain capacitors from over 40% down to 5% by radical changes in manufacturing process through measurement assurance and using QC tools. In a UPS manufacturing firm, he was Project manager for supply of a unique UPS to India’s ambitious missile system. Since 1995, Swanand has been with the Electronics Test & Development Centre (ETDC), Pune, India; a Test and Calibration laboratory under STQC Directorate, Ministry of Electronics & IT, Government of India. He was In-charge of Calibration lab when ETDC got its first accreditation in 2002 for Electrical and Thermal calibration and significantly contributed to establishing the Quality system as per ISO/IEC 17025. Currently he is working as Head (QA & Training) in ETDC, Pune. Since 1998 he has taught in courses and seminars conducted by ETDC on Calibration (Electrical and Thermal), Laboratory Management per ISO/IEC 17025, Measurement Uncertainty and Certified Calibration Professional. He has published a few papers in national and international journals/conferences. He was also a faculty member for a Contact-Session courses on Statistical Process Control (SPC) for MS (Quality Management) programme for post-graduate students of Birla Institute of Technology & Science, Pilani, India. He was a regular guest-lecturer in engineering colleges on subjects such as Measurements, Testing and Calibration; QMS and was also an external Project examiner. He was a member of ‘Syllabus Review committee’ for engineering courses and is also an ISO 9000 Lead Assessor.