_PTC_19-1_Edtn_2005.pdf

AN AMERICAN NATIO NAL STANDARDTest UncertaintyASME PTC 19.1-2005(Revision of ASME PTC 19.1-1998)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.This is Job#000608$FMElectronic Page#1 of 10 PL:PTCFExcept 9999ASME Performance Test CodePTC_19.108-28-06 06:31:01Rev 18.02Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:October 13,2006The 2005 edition of ASME PTC 19.1 will be revised when the Society approves the issuance ofthe next edition.There will be no Addenda issued to ASME PTC 19.1-2005.ASME issues written replies to inquiries as code cases and interpretations of technical aspectsof this document.Code cases and interpretations are published on the ASME website underthe Committee Pages at http:/www.asme.org/codes/as they are issued.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 for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,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 anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which preclude 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2006 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.This is Job#000608$FMElectronic Page#2 of 10PL:PTCF9996ASME Performance Test CodePTC_19.108-28-06 06:31:01Rev 18.02Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSNotice.viiForeword.viiiCommittee Roster.ixSection 1Introduction.11-1General.11-2Harmonization With International Standards.11-3Applications.1Section 2Object and Scope.22-1Object.22-2Scope.2Section 3Nomenclature and Glossary.33-1Nomenclature.33-2Glossary.3Section 4Fundamental Concepts.54-1Assumptions.54-2Measurement Error.54-3Measurement Uncertainty.54-4Pretest and Posttest Uncertainty Analyses.11Section 5Defining the Measurement Process.135-1Overview.135-2Selection of the Appropriate“True Value”.135-3Identification of Error Sources.135-4Categorization of Uncertainties.155-5Comparative Versus Absolute Testing.16Section 6Uncertainty of a Measurement.176-1Random Standard Uncertainty of the Mean.176-2Systematic Standard Uncertainty of a Measurement.186-3Classification of Uncertainty Sources.196-4Combined Standard and Expanded Uncertainty of aMeasurement.19Section 7Uncertainty of a Result.227-1Propagation of Measurement Uncertainties Into a Result.227-2Sensitivity.237-3Random Standard Uncertainty of a Result.237-4Systematic Standard Uncertainty of a Result.247-5Combined Standard Uncertainty and Expanded Uncertainty of aResult.247-6Examples of Uncertainty Propagation.24Section 8Additional Uncertainty Considerations.288-1Correlated Systematic Standard Uncertainties.288-2Nonsymmetric Systematic Uncertainty.318-3Fossilization of Calibrations.358-4Spatial Variation.36iiiThis is Job#000608$FMElectronic Page#3 of 10PL:PTCF Odd PageASME Performance Test CodePTC_19.108-28-06 06:31:01Rev 18.02Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.8-