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It identifies common uncertainty sources, including the measuring instrument, the item measured, the environment, the operator, and other factors. The guide shows how established rules and good practice, such as traceable calibration, careful calculation, and good record keeping, can estimate overall uncertainty and support fitness-for-purpose judgments.",{"@graph":63,"@context":112},[64,80,95],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/measurement-good-practice-guide-issue-2-a-beginners-guide-to-uncertainty-of-measurement/571966/",4,{"url":78,"name":59,"@type":81,"author":82,"headline":59,"publisher":85,"fileFormat":88,"inLanguage":57,"description":61,"dateModified":89,"datePublished":89,"encodingFormat":88,"isAccessibleForFree":90,"interactionStatistic":91},"DigitalDocument",{"name":83,"@type":84},"asba","Person",{"url":68,"name":86,"@type":87},"DocShare","Organization","application/pdf","2026-10-13",true,{"@type":92,"interactionType":93,"userInteractionCount":4},"InteractionCounter",{"@type":94},"ViewAction",{"@type":96,"mainEntity":97},"FAQPage",[98,104,108],{"name":99,"@type":100,"acceptedAnswer":101},"Why must a measurement result include an uncertainty statement?","Question",{"text":102,"@type":103},"A measurement result is only complete when it includes a statement of the uncertainty, so the fitness for purpose of the measurement can be properly judged.","Answer",{"name":105,"@type":100,"acceptedAnswer":106},"What are the main sources of measurement uncertainty?",{"text":107,"@type":103},"Measurement uncertainties can come from the measuring instrument, the item being measured, the environment, the operator, and other sources.",{"name":109,"@type":100,"acceptedAnswer":110},"How can measurement uncertainties be estimated?",{"text":111,"@type":103},"Uncertainties can be estimated using statistical analysis of a set of measurements and by using other information about the measurement process, following established calculation rules.","https://schema.org",{"og:url":78,"og:type":114,"og:title":59,"og:site_name":86,"og:description":61},"article",{"robots":116,"canonical":78},"index,follow",{"doc_id":118,"site_id":56},571966,1791924790,{"code":4,"msg":5,"data":121},{"doc_id":118,"user_id":122,"nickname":83,"user_avatar":123,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":124,"file_id":125,"file_url":126,"file_type":127,"file_size":128,"view_count":4,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":129,"language":130,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":131,"faqs":132,"seo_title":133,"seo_description":61,"update_tm":119,"read_time":20},3985747872567,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","No. 11  \nMeasurement Good Practice Guide  \nA Beginner's Guide to Uncertainty of Measurement  \nStephanie Bell  \nIssue 2  \nThe National Physical Laboratory is operated on behalf oftheDTI byNPL Management Limited, a wholly owned subsidiary of Serco Group plc  \nMeasurement Good Practice Guide No. 11 (Issue 2)  \nA Beginner’s Guide to Uncertainty of Measurement  \nStephanie Bell  \nCentre for Basic, Thermal and Length Metrology National Physical Laboratory  \nAbstract: The aim of this Beginner’s Guide is to introduce the subject of measurement uncertainty. Every measurement is subject to some uncertainty. A measurement result is only complete if it is accompanied by a statement of the uncertainty in the measurement. Measurement uncertainties can come from the measuring instrument, from the item being measured, from the environment, from the operator, and from other sources. Such uncertainties can be estimated using statistical analysis of a set of measurements, and using other kinds of information about the measurement process. There are established rules for how to calculate an overall estimate of uncertainty from these individual pieces of information. The use of good practice – such as traceable calibration, careful calculation, good record keeping, and checking – can reduce measurement uncertainties. When the uncertainty in a measurement is evaluated and stated, the fitness for purpose of the measurement can be properly judged.  \n© Crown Copyright 1999.  \nReproduced by permission of the Controller of HMSO.  \nISSN 1368-6550  \nAugust 1999  \nIssue 2 with amendments March 2001  \nNational Physical Laboratory  \nTeddington, Middlesex, United Kingdom, TW11 0LW  \nThis Guide was produced under the Competing Precisely project - a measurement awareness raising campaign within the National Measurement Partnership Programme, managed on behalf of the DTI by the National Physical Laboratory. NPL is the UK’s centre for measurement standards, and associated science and technology.  \nFor more information, or for help with measurement problems, contact the NPL Helpline on:  \n020 8943 6880 or e-mail: [enquiry@npl.co.uk](enquiry@npl.co.uk).  \nA Beginner’s Guide to Uncertainty of Measurement  \nContents  \nForeword  \n1 Measurement................................................................................................................... 1  \n1.1 What is a measurement?.......................................................................................... 1  \n1.2 What is not a measurement?.................................................................................... 1  \n2 Uncertainty of measurement..........................................................................................1  \n2.1 What is uncertainty of measurement? ..................................................................... 1  \n2.2 Expressing uncertainty of measurement.................................................................. 1  \n2.3 Error versus uncertainty ..........................................................................................2  \n2.4 Why is uncertainty of measurement important?......................................................2  \n3 Basic statistics on sets of numbers.................................................................................3  \n3.1 ‘Measure thrice, cut once’... operator error...........................................................3  \n3.2 Basic statistical calculations....................................................................................4  \n3.3 Getting the best estimate-taking the average of a number of readings..................4  \n3.4 How many readings should you average? ...............................................................4  \n3.5 Spread ... standard deviation...................................................................................5  \n3.6 Calculating an estimated standard deviation ...........................................................6  \n3.7 How many readings do you need ","cbCaik0bcHzhGcmW","https://ap.wps.com/l/cbCaik0bcHzhGcmW","pdf",437305,41,"English","# Foreword\n# Measurement\n## What is a measurement?\n## What is not a measurement?\n# Uncertainty of measurement\n## What is uncertainty of measurement?\n## Expressing uncertainty of measurement\n## Error versus uncertainty\n## Why is uncertainty of measurement important?\n# Basic statistics on sets of numbers\n## Measure thrice, cut once\n## Basic statistical calculations\n## Getting the best estimate\n## How many readings should you average?\n## Spread and standard deviation","[{\"question\":\"Why must a measurement result include an uncertainty statement?\",\"answer\":\"A measurement result is only complete when it includes a statement of the uncertainty, so the fitness for purpose of the measurement can be properly judged.\"},{\"question\":\"What are the main sources of measurement uncertainty?\",\"answer\":\"Measurement uncertainties can come from the measuring instrument, the item being measured, the environment, the operator, and other sources.\"},{\"question\":\"How can measurement uncertainties be estimated?\",\"answer\":\"Uncertainties can be estimated using statistical analysis of a set of measurements and by using other information about the measurement process, following established calculation rules.\"}]","Measurement Good Practice Guide - Issue 2 - A Beginner's Guide to Uncertainty of Measurement | PDF"]