How can the CMC of a laboratory be expressed in the field of NAWI calibration?

How can the CMC of a laboratory be expressed in the field of NAWI calibration? | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article How can the CMC of a laboratory be expressed in the field of NAWI calibration? Adriana Vâlcu, Adela Călin This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9550925/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract A “CMC” is a calibration and measurement capability available to customers under normal conditions; in other words, it expresses how well a laboratory can measure. Calibration laboratories shall furnish evidence that they can provide calibrations to customers such that the measurement uncertainties are equal to the stated/accredited CMC. In practice, in the field of Non-Automatic Weighing Instruments (NAWI) calibration, for the expression of CMC for different measurement points, most accredited laboratories use fixed values (relative or absolute). In this paper, several examples of CMCs from accredited laboratories were analysed. Only the first measurement interval of a NAWI, which contains the smallest loads, was considered. It can be seen that, for a load of 1 mg and for adjacent values (such as 10 mg), the uncertainty described by the CMC is lower than the expanded uncertainty of the standard weight used (in some cases even 2000 or 1000 times, when weights of class E 1 are used) which indicates that the requested CMC is not realistically achievable. The paper proposes a way to express the CMC for a NAWI using a function having the form f(x)=a+bx . The goal is to obtain a linear function for CMCs, including the situation when a sum of weights is used. The resulting CMC will be much more realistic, so that any request from a client regarding a calibration with that uncertainty will be obtained. This paper presents an example using a set of E 1 weights. Calibration and Measurement Capability (CMC) calibration of NAWI expanded uncertainty Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-9550925","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":630884621,"identity":"73f4ffd3-03cc-4929-ad1f-ef95c89e0dd9","order_by":0,"name":"Adriana Vâlcu","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAwElEQVRIiWNgGAWjYFCCxAYQKcfAwEOiFmNStCTANBKrhb89uU3i5x6b9A3Hzx588IHBTk63gYAWiTMP2yR7nqXlbjiTl2w4gyHZ2OwAIWtuJDYb8Bw4nLvhQI6ZNA/DgcRthLTIA7UY/jlwON3g/BsitRjcSGx8DLQlweAGsbYYnnnY+FjmQJrhzBtvjA1nGBDhF7nj6Q8OvjlgI893PsfwwYcKOznC3ocBBbBKA2KVg4B8AymqR8EoGAWjYEQBAKWcR79vtpklAAAAAElFTkSuQmCC","orcid":"https://orcid.org/0000-0001-5917-2753","institution":"Romanian Accreditation Association-RENAR","correspondingAuthor":true,"prefix":"","firstName":"Adriana","middleName":"","lastName":"Vâlcu","suffix":""},{"id":630884622,"identity":"5ca621b1-5b6d-40f2-808a-a952727640c1","order_by":1,"name":"Adela Călin","email":"","orcid":"","institution":"Timisoara University of Medicine and Pharmacy","correspondingAuthor":false,"prefix":"","firstName":"Adela","middleName":"","lastName":"Călin","suffix":""}],"badges":[],"createdAt":"2026-04-28 08:29:23","currentVersionCode":1,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-9550925/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-9550925/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":108491460,"identity":"2430c622-ea29-43ec-8edd-3a6f0d9fd4bd","added_by":"auto","created_at":"2026-05-05 09:54:01","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":469680,"visible":true,"origin":"","legend":"","description":"","filename":"CMCexpressionNAWIcalibration.pdf","url":"https://assets-eu.researchsquare.com/files/rs-9550925/v1_covered_978392c3-1a25-447c-9bb5-c025e854359c.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003eHow can the CMC of a laboratory be expressed in the field of NAWI calibration?\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Calibration and Measurement Capability (CMC), calibration of NAWI, expanded uncertainty","lastPublishedDoi":"10.21203/rs.3.rs-9550925/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-9550925/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eA “CMC” is a calibration and measurement capability available to customers under normal conditions; in other words, it expresses how well a laboratory can measure. Calibration laboratories shall furnish evidence that they can provide calibrations to customers such that the measurement uncertainties are equal to the stated/accredited CMC. In practice, in the field of Non-Automatic Weighing Instruments (NAWI) calibration, for the expression of CMC for different measurement points, most accredited laboratories use fixed values (relative or absolute). In this paper, several examples of CMCs from accredited laboratories were analysed. Only the first measurement interval of a NAWI, which contains the smallest loads, was considered. It can be seen that, for a load of 1 mg and for adjacent values (such as 10 mg), the uncertainty described by the CMC is lower than the expanded uncertainty of the standard weight used (in some cases even 2000 or 1000 times, when weights of class E\u003csub\u003e1\u003c/sub\u003e are used) which indicates that the requested CMC is not realistically achievable. 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