ASME_B89.7.6-2019.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B89.7.6-2019Guidelines for the Evaluation of Uncertainty of Test Values Associated With the Verification of Dimensional Measuring Instruments to Their Performance SpecificationsASME B89.7.6-2019Guidelines for theEvaluation of Uncertaintyof Test Values AssociatedWith the Verification ofDimensional MeasuringInstruments to TheirPerformance SpecificationsAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:June 12,2020This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Interpretations arepublishedontheCommitteewebpageandunderhttp:/go.asme.org/InterpsDatabase.PeriodicallycertainactionsoftheASMEB89 Committee may be published as Cases.Cases are published on the ASME website under the B89 Committee Page athttp:/go.asme.org/B89committee as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.The B89 Committee Page can be found at http:/go.asme.org/B89committee.There is an option available to automaticallyreceive an e-mail notification when errata are posted to a particular code or standard.This option can be found on theappropriate Committee Page after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto participate.The proposed codeorstandardwasmadeavailable forpublic reviewandcommentthatprovidesanopportunityfor additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in thisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2020 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B89 Committee.viPreface.viii1Scope.12Definitions.13References.14Basic Concepts of Test Values and Test Value Uncertainty.25Evaluation of Test Value Uncertainty.5Nonmandatory AppendixAExample:Verification of a CMM to Its ASME B89.4.10360.2 Performance Specifications.9Figures4.1-1A Caliper Under Verification to Its MPE Specification by a Verification System Composed ofCalibrated Gauge Blocks Using a Simple Acceptance Decision Rule.35.1-1An Example of Five Test Values,All From the Same Reference Length.5TableA-1-1TestValueUncertaintyforTestValuesObtainedUsinga500-mmCalibratedGaugeBlockandaTestCondition of 23C.10iiiFOREWORDJCGM100:2008,“EvaluationofmeasurementdataGuidetotheexpressionofuncertaintyinmeasurement,”knownasGUM,contains the internationally accepted method of expressing measurement uncertainty.The United States hasadopted GUM as a national standard.The evaluation of measurement uncertainty has been applied for some timeat national measurement institutes,but more recently,issues such as measurement traceability and laboratory accred-itation are resulting in its widespread use in calibration laboratories.Given the potential impact to business practices,national and international standards committees are working topublish new standards that will facilitate the integration of the GUM approach and the consideration of measurementuncertainty.In support of this effort,the ASME B89 Committee for Dimensional Metrology has formed Division 7,Measurement Uncertainty.Measurement uncertainty has important economic consequences for calibration and measurement activities.In cali-bration reports,