1、BRITISH STANDARDBS EN 60706-5:2007Maintainability of equipment Part 5: Testability and diagnostic testingICS 03.120.01; 03.120.30; 21.020; 29.020g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g
2、37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60706-5:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 54763 8National forewordThis British Standard is the UK implementation of EN 60706-5:2007. I
3、t is identical to IEC 60706-5:2007. It supersedes BS 6548-5:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee DS/1, Dependability and terotechnology, to Subcommittee DS/1/1, Dependability.A list of organizations represented on this committee can be
4、 obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publica
5、tionDate CommentsEUROPEAN STANDARD EN 60706-5 NORME EUROPENNE EUROPISCHE NORM October 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 105
6、0 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60706-5:2007 E ICS 03.120.01; 03.120.30; 21.020 English version Maintainability of equipment - Part 5: Testability and diagnostic testing (IEC 60706-5:2007) Maintenab
7、ilit de matriel - Partie 5: Testabilit et tests pour diagnostic (CEI 60706-5:2007) Instandhaltbarkeit von Gerten - Teil 5: Prfbarkeit und diagnostisches Prfen (IEC 60706-5:2007) This European Standard was approved by CENELEC on 2007-10-01. CENELEC members are bound to comply with the CEN/CENELEC Int
8、ernal 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 concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC
9、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 CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN
10、ELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovaki
11、a, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 56/1211/FDIS, future edition 2 of IEC 60706-5, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60706-5 on 2007-10-01. The following dat
12、es were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-10-01 Annex ZA has been added by
13、CENELEC. _ Endorsement notice The text of the International Standard IEC 60706-5:2007 was approved by CENELEC as a European Standard without any modification. _ EN 60706-5:2007 2 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references7 3 Terms, definitions and acronyms.7 3.1 Terms and definitions 7
14、 3.2 Acronyms 12 4 Description of testability and diagnostic testing12 4.1 General .12 4.2 Objectives of testability14 4.3 Objectives of diagnostic testing15 4.4 Methods used for diagnostic testing .16 4.5 Methods used for condition monitoring.16 4.6 Concept of testability .16 5 Testability specific
15、ation.17 5.1 General .17 5.2 Statement of work18 5.3 Specification18 5.4 Characteristics of testability .22 5.4.1 Testability features 22 5.4.2 Operational context225.4.3 Test tasks22 5.5 Characteristic values for assessing testability 24 5.6 Criteria for evaluation of alternative diagnostic designs
16、 24 6 Testability in the development process25 6.1 General .25 6.2 Functional assignment.26 6.3 Testability engineering.26 6.3.1 Design criteria for testability.26 6.3.2 Design for testability 27 6.3.3 Use of commercial off-the-shelf products (COTS).27 6.4 Testability development process 28 6.4.1 Lo
17、gistic support .28 6.4.2 Availability and diagnostic testing.29 7 Assessment of testability 29 7.1 General .29 7.2 Verification by analysis 29 7.3 Verification by tests .29 8 Testability documentation .30 Annex A (informative) Calculation of characteristics of fault recognition and fault localizatio
18、n31 Annex B (informative) Development process for testable products 37 Annex ZA (normative) Normative references to international publications with their corresponding European publications 63 EN 60706-5:2007 3 Bibliography62 Figure 1 Testability and diagnostic testing during the life cycle13 Figure
19、 2 Operational context 22 Figure 3 Development process in the V-model 25 Figure 4 Design levels and their logistic assignment, taking an aircraft as an example 28 Figure B.1 Example of how to determine the basic data 37 Figure B.2 Modelling of sub-functions and terminals .39 Figure B.3 Functional mo
20、del showing the functional terminals between the sub-functions.39 Figure B.4 Functional model with inserted hardware units .41 Figure B.5 Functional model showing stimulation and measuring points 42 Figure B.6 Functional model showing test paths .43 Figure B.7 Portions of the test task.44 Figure B.8
21、 Functional model showing the test paths of portion A .46 Figure B.9 Functional model showing the test paths of portions A + B + C + D 48 Figure B.10 Functional model of case study 1.50 Figure B.11 Functional model of case study 2.51 Figure B.12 Fault localization portions 53 Figure B.13 Functional
22、model with additional stimulation and measuring points.55 Figure B.14 Selection criteria for verification.58 Figure B.15 Functional model shown in the form of an extended block diagram.60 Table 1 Elements of the operational concept 20 Table 2 Elements of the maintenance concept21 Table 3 Test task .
23、23 Table 4 Example of logistic assignment 29 Table B.1 Data for the document “system specification“38 Table B.2 Data for the document “test specification“ (assignment of function to parameter)40 Table B.3 Database with hardware units and logistic assignment added41 Table B.4 Database expanded to inc
24、lude the test steps 42 Table B.5 Database expanded to include the test paths 43 Table B.6 Database expanded to include the test task portions.44 Table B.7 Determination of how many terminals and hardware units there are.45 Table B.8 Matrix showing coverage of terminals and paths .45 Table B.9 Determ
25、ination of the characteristic value for the quality of the fault recognition (FR) during operation (section A).46 Table B.10 Determination of the characteristic value for the quality of the fault recognition (FR) under test conditions (Portions A+B+C+D) .48 Table B.11 Coverage matrix .49 Table B.12
26、Coding of terminals.50 EN 60706-5:2007 4 Table B.13 Sum field50Table B.14 Fault localization matrix of case study 1 51 Table B.15 Fault localization matrix of case study 2 51 Table B.16 Determining the characteristic value for the quality of fault localization (FL).52 Table B.17 Determination of the
27、 locatability of the hardware units .54 Table B.18 Data table expanded to include test path PP 5 55 Table B.19 Determination of the locatability of the hardware units, including additional test path 5.56Table B.20 Verification record 58 Table B.21 Example of the document “system specification“ .59 T
28、able B.22 Example of the document “test specification“ 60 Table B.23 Verification record 61 EN 60706-5:2007 5 INTRODUCTION Testability is an important feature in the operation and maintenance of a system or equipment and has a significant effect on its availability and maintainability. Diagnostic te
29、sting may be carried out manually or with test equipment which may contain various levels of automation. Optimum design for testability requires close cooperation between design, operation and maintenance organizations. This standard is intended to highlight the various aspects of testability and di
30、agnostic testing and to assist in their timely coordination. In this standard, items to be considered in respect of their testability design may be systems, equipment or functional units which are the objects of a contract, and will be referred to as “products“. Each product has to perform its requi
31、red functions which should be verified during the development and production phases and should be retained over the whole life cycle. For a product to retain its functionality, the functional status of each sub-function should be known at any time while the product is in its operating condition. If
32、a failure occurs, action should be taken to ensure that the fault is recognized and the faulty item localized. This requirement placed on the testability of a product might appear to be quite simple, but if it is not considered at the start of product development, subsequent realization will result
33、in increased work and significantly increased cost. If all requirements are available at the start of development, the development engineer can specify the functional characteristic “testability“ without much additional effort and therefore achieve considerable cost savings e.g. by minimizing the nu
34、mber of test steps for verifying the development results. Experience has shown that the extra cost and effort in the development phase can be recovered for example in the production phase since available test equipment can be used. Reliable fault recognition and low in-service maintenance costs incr
35、ease the market value of a testable product considerably. As the technologies which are applied in the products covered by this standard are wide-ranging, this document has been written in a neutral manner with regard to technologies and techniques. This standard therefore only provides an assessmen
36、t basis for making calculations and the basic approach for achieving the required testability of a product. The technical realization of fault recognition and fault localization in the product is the task of the product development engineer and has to be achieved according to the state of the art at
37、 the time when the product is being developed. It is therefore not of great importance whether the required test task is realized in hardware or software form, but it is essential that all functions are checked via test paths and that the characteristic values established for testability correspond
38、to the specified target values. If there are deviations from the target values, action should be taken to ensure that the target values are met. These actions should take place at an early stage of development before freezing the design. EN 60706-5:2007 6 MAINTAINABILITY OF EQUIPMENT Part 5: Testabi
39、lity and diagnostic testing 1 Scope The purpose of this part of IEC 60706 is to provide guidance for the early consideration of testability aspects in design and development; assist in determining effective test procedures as an integral part of operation and maintenance. This International Standard
40、 can be applied to all types of products which may include commercial off-the-shelf (COTS) items. In this respect, it does not matter whether the product belongs to mechanical, hydraulic, electrical or some other technology. In addition, this International Standard applies to the development of any
41、products, with the aim of designing the product characteristics so that they are verifiable (testable). The objective of this International standard is to ensure that prerequisites relating to the testability of products are defined in the preliminary phases of development, laid down by the customer
42、, implemented, documented and verified during development. This International Standard also provides methods to implement and assess testability as an integral part of the product design. It recommends that the product testability documentation should be continually updated over the products life cy
43、cle. 2 Normative references The following documents are indispensable for the application 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. IEC 60050-191, International Ele
44、ctrotechnical Vocabulary Chapter 191: Dependability and quality of service IEC 60706-2, Maintainability of equipment Part 2: Maintainability requirements and studies during the design and development phase IEC 60706-3, Maintainability of equipment Part 3: Verification and collection, analysis and pr
45、esentation of data IEC 60300-3-10, Dependability management Part 3-10: Application guide Maintainability 3 Terms, definitions and acronyms 3.1 Terms and definitions For the purposes of this document, the terms and definitions of IEC 60050-191 apply together with the following: EN 60706-5:2007 7 3.1.
46、1 built-in test BIT integrated capability of a test item enabling automatic fault recognition and fault localization 3.1.2 built-in test equipment BITE hardware and/or software assigned to the built-in test 3.1.3 commercial off-the-shelf COTS designates items readily available commercially 3.1.4 cri
47、ticality significance attached to a malfunction NOTE Criticality is expressed in grades: the higher the grade, the more severe the consequences to be expected from the malfunction. 3.1.5 depth of test specification of the level to which the unit or sub-unit is to be identified 3.1.6 design level lev
48、el to which the design elements (functional and/or physical units), when they already exist, are assigned within the product breakdown structure NOTE In some cases “design level” is known as “indenture level”. 3.1.7 diagnosis correctness proportion of faults of an item that can be correctly diagnose
49、d under given conditions 3.1.8 diagnostic testing test procedure carried out in order to make a diagnosis 3.1.9 false alarm indication of failure which, after carrying out failure finding activities, is not found 3.1.10 false alarm rate the percentage of false alarms in the total number of failure indications 3.1.11 fault recognition time period of time between the instant of failure and fault recognition EN 60706-5:2007 8 3.1.12 fault
