2001_2011.pdf

REAFFIRMED 2011FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blank AN AMERICAN NA TIONALST ANDARDGUIDELINES FOR DECISION RULES:CONSIDERING MEASUREMENTUNCERTAINTY IN DETERMININGCONFORMANCE TO SPECIFICATIONSASME B89.7.3.1-2001Date of Issuance:March 18,2002This 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 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B89 Committee.viiAbstract.viii1Scope.12Definitions.13Requirements for Decision Rules.23.12Zone Identification.3.22Decision Outcome.3.32Repeated Measurements.3.42Data Rejection.4Acceptance and Rejection Zones in Decision Rules.34.13Simple Acceptance and Rejection Using a N:1 Decision Rule.4.24Stringent Acceptance and Relaxed Rejection Using a Z%Guard Band.4.34Stringent Rejection and Relaxed Acceptance Using a Z%Guard Band.4.45Decision Rules With a Transition Zone.5Examples of Decision Rules.55.15.5.26.5.36.5.46.Figures1An Example of Guard Bands Used for Creating a Binary Decision RuleWith Stringent Acceptance and Relaxed Rejection Zones.323An Example of Simple Acceptance and Rejection Using a 4:1 Ratio.34Stringent Acceptance and Relaxed Rejection Examples.45Symmetric Two-Sided Relaxed Acceptance and Stringent Rejection.5Stringent Acceptance,Simple Rejection,and a Transition Zone ExampleUsing Symmetric Two-Sided Guard Banding.5Nonmandatory AppendicesA7Application of Decision Rules in the Customer-Supplier Relationship.B8Repeated Measurement.C9Outlier Measurement Results.D10Special Issues of Decision Rules for Instrumentation.E12Determination of Guard Band Limits.F13A Discussion of ISO 14253-1.G14References.iiiFOREWORDThe intent of these guidelines is to facilitate the development of understanding betweensuppliers and customers regarding measurement uncertainty in the decision to accept or toreject a product.Metrologists are continuously faced with the task of making decisions inthe presence of measurement uncertainty.To formalize this task,procedures known asdecision rules have been developed.A decision rule is a prescription for the acceptanceor rejection of products based on the measurement result of a characteristic of the product,the permissible variation associated with that characteristic,and the uncertainty of themeasurement result.For workpieces,the permissible variation is commonly called thetolerance;for instruments it is often given by the specification limits or maximum permissibleerror(MPE).The terminology of ISO 14253-1 has been adopted and the permitted variationof a products characteristic is referred to as the specification zone.This document isintended to provide guidance on decision rules and their implementation.A related document,ASME B89.7.2-1999,Dimensional Measurement Planning,specifiesrequirements for preparation and approval of dimensional measurement plans and for theuse of approved plans in making dimensional measurements.The dimensional measurementplan must contain or