2002_2017.pdf

ASME B89.7.3.3-2002GUIDELINES FOR ASSESSING THE RELIABILITY OFDIMENSIONAL MEASUREMENTUNCERTAINTY STATEMENTSA N A M E R I C A N N A T I O N A LS T A N D A R DASME B89.7.3.3-2002GUIDELINES FOR ASSESSING THE RELIABILITY OFDIMENSIONAL MEASUREMENTUNCERTAINTY STATEMENTSA N A M E R I C A N N A T I O N A LS T A N D A R DREAFFIRMED 2017Intentionally left blank AN AMERICAN NA TIONALST ANDARDGUIDELINES FOR ASSESSING THE RELIABILITY OFDIMENSIONAL MEASUREMENTUNCERTAINTY STATEMENTSASME B89.7.3.3-2002Date of Issuance:February 21,2003This Standard will be revised when the Society approves the issuance of anew edition.There will be no addenda issued to this edition.ASME will issue written replies to inquiries concerning interpretation oftechnical aspects of this Standard.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that provides an opportunity for 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 inconnection withany itemsmentioned inthis document,and doesnot undertaketo insureanyoneutilizing a standard against liability for infringement of any applicable letters patent,nor assumeany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies,which precludes the issuanceof 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2003 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B89 Committee.viAbstract.11Scope.11.11Objective.1.21Applicability.1.31Purpose.2Definitions.13The Nature of Disagreements in Uncertainty Statements.23.12General.3.22Disagreements Involving Single Measurement Systems.3.32Disagreements Involving Multiple Measurement Systems.4Causes of Disagreement in Measurement Results HavingUncertainty Statements.44.14General.4.24Blunders.4.34GUM Noncompliance and Uncorrected Systematic Errors.4.44Poorly Realized or Incompletely DefineMeasurand.4.55Statistically Rare Measurement Results.4.65Incomplete Uncertainty Statements.5Methods of Resolution.55.15General.5.25Significancof Disagreement.5.36Comparison of Uncertainty Budgets.5.48Direct Measurement of the Measurand.6References.10Figures13Examples of Measurement Agreement and Disagreement.23Example of Product Conformance Disagreement.iiiFOREWORDThe ISO Guide to the Expression of Uncertainty in Measurement(GUM)is now theinternationally-accepted method of expressing measurement uncertainty.The U.S.has adoptedthe GUM as a national standard.(See ANSI/NCSL Z540-2.)The evaluation of measurementuncertainty has been applied for some time at national measurement institutes but morerecently issues such as measurement traceability and laboratory accreditation are resultingin its widespread use in calibration laboratories.Given the potential impact to business practices,national and international standardscommittees are working to publish new standards and technical reports that will facilitatethe integration of the GUM approach and the consideration of measurement uncertainty.Insupport of this effort,ASME B89 Committee for Dimensional Metrology has formed Division7,Measurement Uncertainty.Measurement uncertainty has important economic consequences for calibration and measure-ment activities.In calibration reports,the magnitude of the uncertainty is often taken asan indication of the quality of the laboratory,and smaller uncertainty values generally areof higher value and of higher cost.In the sorting of artifacts into classes or grades,uncertainty has an economic impact through the use of decision rules.ASME B89.7.3.1,Guidelines to Decision Rules in Determining Conformance to Specif cations,addresses therole of measurement uncertainty when accepting or rejecting products based on a meas