1、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
2、 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
3、 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 a
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8、 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 othe
9、rwise,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 th
10、e 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
11、 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
12、.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 Measureme
13、nt(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 m
14、easurement 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 integ
15、ration 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 ca
16、libration 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