1、Assembly tools for screws andnuts Hand torque toolsPart 2: Requirements for calibration and determination of measurement uncertainty(ISO 6789-2:2017)BS EN ISO 6789-2:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK
2、implementation of EN ISO 6789-2:2017. Together with BS EN ISO 6789-1:2017, it supersedes BS EN ISO 6789:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MTE/15, Hand tools.A list of organizations represented on this committee can be obtained onreque
3、st to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 84936 7ICS 25.140.30Compliance with a British St
4、andard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 6789-2:2017EUROPEAN STANDARD NORME EUR
5、OPENNE EUROPISCHE NORM EN ISO 6789-2 March 2017 ICS 25.140.30 Supersedes EN ISO 6789:2003English Version Assembly tools for screws and nuts - Hand torque tools - Part 2: Requirements for calibration and determination of measurement uncertainly (ISO 6789-2:2017) Outils de manoeuvre pour vis et crous
6、- Outils dynamomtriques commande manuelle - Partie 2: Exigences dtalonnage et dtermination de lincertitude de mesure (ISO 6789-2:2017) Schraubwerkzeuge - Handbettigte Drehmomentwerkzeuge - Teil 2: Anforderungen an die Kalibrierung und die Bestimmung der Messunsicherheit (ISO 6789-2:2017) This Europe
7、an Standard was approved by CEN on 14 January 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references con
8、cerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member i
9、nto its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
10、 Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCH
11、ES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6789-2:2017 EBS EN ISO 6789-2:2017EN ISO 6789-2:2017 (E) 2 Contents Page European forew
12、ord . 3 BS EN ISO 6789-2:2017EN ISO 6789-2:2017 (E) 3 European foreword This document (EN ISO 6789-2:2017) has been prepared by Technical Committee ISO/TC 29 “Small tools”. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endor
13、sement, at the latest by September 2017, and conflicting national standards shall be withdrawn at the latest by March 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for ident
14、ifying any or all such patent rights. This document supersedes EN ISO 6789:2003. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republ
15、ic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom
16、. Endorsement notice The text of ISO 6789-2:2017 has been approved by CEN as EN ISO 6789-2:2017 without any modification. BS EN ISO 6789-2:2017ISO 6789-2:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions and symbols 13.1 Terms and definitions . 23.2 Symbols, des
17、ignations and units . 24 Requirements for calibration 44.1 Calibration during use 44.2 Calibration method 44.3 Calibration system . 45 Measurement error . 55.1 Calculation of the relative measurement error . 55.2 Exemplary calculations of the relative measurement error 55.2.1 Example 1 . 55.2.2 Exam
18、ple 2 . 66 Sources of uncertainty 76.1 General . 76.2 Evaluation of Type B uncertainties due to the torque tool . 86.2.1 Scale, dial or display resolution, r 86.2.2 Variation due to the reproducibility of the torque tool, brep106.2.3 Variation due to the interface between the torque tool and the cal
19、ibration system116.2.4 Variation due to the variation of the force loading point, bl.126.3 Evaluation of Type A uncertainty due to the torque tool 136.3.1 General. 136.3.2 Variation due to the repeatability of the torque tool, bre137 Determination of the calibration result 137.1 Determination of the
20、 relative standard measurement uncertainty, w. 137.2 Determination of the relative expanded measurement uncertainty, W . 147.3 Determination of the relative measurement uncertainty interval, W . 148 Calibration certificate 15Annex A (informative) Calculation example for an indicating torque tool (Ty
21、pe I) .16Annex B (informative) Calculation example for a setting torque tool (Type II) .25Annex C (normative) Minimum requirements for the calibration of the torque measurement device and the estimation of its measurement uncertainty .34Bibliography .41 ISO 2017 All rights reserved iiiContents PageB
22、S EN ISO 6789-2:2017ISO 6789-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body
23、interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotech
24、nical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO d
25、ocuments should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held res
26、ponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information g
27、iven for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) prin
28、ciples in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 10, Assembly tools for screws and nuts, pliers and nippers.This first edition of ISO 6789-2, together wi
29、th ISO 6789-1, cancels and replaces ISO 6789:2003 which has been technically revised with changes as follows.a) ISO 6789:2003 has been divided into two parts. ISO 6789:2003 has become ISO 6789-1 which specifies the requirements for design and manufacture including the content of a declaration of con
30、formance. This document specifies the requirements for traceable certificates of calibration. It includes a method for calculation of uncertainties and provides a method for calibration of the torque measurement device used for calibrating hand torque tools.b) This document includes detailed methods
31、 for calculation of the uncertainty budget which shall be performed for each individual tool.c) This document includes example calculations that are provided for different types of torque tool.d) Annex C provides requirements for calibrating the torque measurement device where the calibration labora
32、tory does not utilize a national standard giving such requirements.A list of all parts in the ISO 6789 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 6789-2:2017ISO 6789-2:2017(E)IntroductionThe revision of ISO 6789:2003 has been designed to achieve the following imp
33、rovements.ISO 6789 has been split to provide two levels of documentation. It recognizes the different needs of different users of the standard.ISO 6789-1 continues to provide designers and manufacturers with relevant minimum requirements for the development, production and documentation of hand torq
34、ue tools.This document provides detailed methods for calculation of uncertainties and requirements for calibrations. This will allow users of calibration services to more easily compare the calibrations from different laboratories. Additionally, minimum requirements for the calibration of torque mea
35、surement devices are described in Annex C.The purpose of this document is to define the requirements for a calibration in which the sources of uncertainty are evaluated and used to define the range of values within which the readings probably fall. Additional uncertainties may exist in the use of th
36、e torque tool. The evaluation of uncertainties for each individual tool is time-consuming and where there are sufficient data to estimate the Type B uncertainty components by statistical means, it is acceptable to use these values for a given model of torque tool, providing that the uncertainty comp
37、onents are subject to periodic review. ISO 2017 All rights reserved vBS EN ISO 6789-2:2017Assembly tools for screws and nuts Hand torque tools Part 2: Requirements for calibration and determination of measurement uncertainty1 ScopeThis document specifies the method for the calibration of hand torque
38、 tools and describes the method of calculation of measurement uncertainties for the calibration.This document specifies the minimum requirements for the calibration of the torque measurement device where the relative measurement uncertainty interval, Wmd, is not already provided by a traceable calib
39、ration certificate.ISO 6789 is applicable for the step by step (static) and continuous (quasi-static) calibration of torque measurement devices, the torque of which is defined by measuring of the elastic form change of a deformable body or a measured variable which is in proportion to the torque.Thi
40、s document applies to hand torque tools which are classified as indicating torque tools (Type I) and setting torque tools (Type II).NOTE Hand torque tools covered by this document are the ones identified in ISO 1703:2005 by reference numbers 6 1 00 11 0, 6 1 00 11 1 and 6 1 00 12 0, 6 1 00 12 1 and
41、6 1 00 14 0, 6 1 00 15 0. ISO 1703 is currently under revision. In the next edition, torque tools will be moved to an own clause, and with this change the reference numbers will also change and additional reference numbers will be added.2 Normative referencesThe following documents are referred to i
42、n the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6789-1:2017, Assembly tools for scr
43、ews and nut Hand torque tools Part 1: Requirements and methods for design conformance testing and quality conformance testing: minimum requirements for declaration of conformanceISO/IEC 17025, General requirements for the competence of testing and calibration laboratories3 Terms, definitions and sym
44、bolsFor the purposes of this document, the terms and definitions given in ISO 6789-1 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing plat
45、form: available at h t t p :/ www .iso .org/ obpINTERNATIONAL STANDARD ISO 6789-2:2017(E) ISO 2017 All rights reserved 1BS EN ISO 6789-2:2017ISO 6789-2:2017(E)3.1 Terms and definitions3.1.1Type A evaluation (of uncertainty)method of evaluation of uncertainty by the statistical analysis of series of
46、observationsNote 1 to entry: These data are taken directly from the measurements obtained during calibration of each torque tool and cannot be prepared in advance.SOURCE: ISO/IEC Guide 98-3:2008, 2.3.2, modified Note 1 to entry has been added.3.1.2Type B evaluation (of uncertainty)method of evaluati
47、on of uncertainty by means other than the statistical analysis of series of observationsSOURCE: ISO/IEC Guide 98-3:2008, 2.3.33.1.3calibration systemcombination of a measurement device and the loading system for application of torque that acts as the measurement standard for the hand torque toolNote
48、 1 to entry: A calibration system can also be used as a torque measurement system as defined in ISO 6789-1.3.1.4measurement deviceworking measurement standard provided either mechanically or by an electronic torque transducer and displayNote 1 to entry: A measurement device can also be referred to a
49、s a torque measurement device as defined in ISO 6789-1.3.1.5reference measurement standardmeasurement standard designated for the calibration of other measurement standards for quantities of a given kind in a given organization or at a given locationSOURCE: ISO Guide 99:2007, 5.63.1.6measurement errormeasured quantity value minus a reference quantity valueSOURCE: ISO/IEC Guide 99:2007, 2.16, modified Notes 1 and 2 to entry have been omitted.3.2 Symbols, designations and unitsThe designations used in this document are ind
