IEC 60706-5:2007

IEC 60706-5
Edition 2.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Maintainability of equipment –
Part 5: Testability and diagnostic testing

Maintenabilité de matériel –
Partie 5: Testabilité et tests pour diagnostic

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IEC 60706-5
Edition 2.0 2007-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Maintainability of equipment –
Part 5: Testability and diagnostic testing

Maintenabilité de matériel –
Partie 5: Testabilité et tests pour diagnostic

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XB
CODE PRIX
ICS 03.120.01; 03.120.30; 21.020 ISBN 2-8318-9295-3

– 2 – 60706-5 © IEC:2007
CONTENTS
FOREWORD.5
INTRODUCTION.7

1 Scope.8
2 Normative references.8
3 Terms, definitions and acronyms.8
3.1 Terms and definitions .8
3.2 Acronyms .13
4 Description of testability and diagnostic testing.13
4.1 General .13
4.2 Objectives of testability.15
4.3 Objectives of diagnostic testing.16
4.4 Methods used for diagnostic testing .17
4.5 Methods used for condition monitoring .17
4.6 Concept of testability .17
5 Testability specification.18
5.1 General .18
5.2 Statement of work.19
5.3 Specification.19
5.4 Characteristics of testability .23
5.4.1 Testability features .23
5.4.2 Operational context.23
5.4.3 Test tasks.23
5.5 Characteristic values for assessing testability .25
5.6 Criteria for evaluation of alternative diagnostic designs .25
6 Testability in the development process.26
6.1 General .26
6.2 Functional assignment .27
6.3 Testability engineering.27
6.3.1 Design criteria for testability.27
6.3.2 Design for testability .28
6.3.3 Use of commercial off-the-shelf products (COTS).28
6.4 Testability development process .29
6.4.1 Logistic support .29
6.4.2 Availability and diagnostic testing .30
7 Assessment of testability .30
7.1 General .30
7.2 Verification by analysis .30
7.3 Verification by tests .30
8 Testability documentation .31

Annex A (informative) Calculation of characteristics of fault recognition and fault
localization.32
Annex B (informative) Development process for testable products .38

60706-5 © IEC:2007 – 3 –
Bibliography .63

Figure 1 – Testability and diagnostic testing during the life cycle.15
Figure 2 – Operational context .23
Figure 3 – Development process in the V-model .26
Figure 4 – Design levels and their logistic assignment, taking an aircraft as an example .29
Figure B.1 – Example of how to determine the basic data .38
Figure B.2 – Modelling of sub-functions and terminals .40
Figure B.3 – Functional model showing the functional terminals between the sub-
functions .40
Figure B.4 – Functional model with inserted hardware units .42
Figure B.5 – Functional model showing stimulation and measuring points .43
Figure B.6 – Functional model showing test paths .44
Figure B.7 – Portions of the test task.45
Figure B.8 – Functional model showing the test paths of portion A .47
Figure B.9 – Functional model showing the test paths of portions A + B + C + D .49
Figure B.10 – Functional model of case study 1.51
Figure B.11 – Functional model of case study 2.52
Figure B.12 – Fault localization portions .54
Figure B.13 – Functional model with additional stimulation and measuring points.56
Figure B.14 – Selection criteria for verification.59
Figure B.15 – Functional model shown in the form of an extended block diagram.61

Table 1 – Elements of the operational concept .21
Table 2 – Elements of the maintenance concept.22
Table 3 – Test task .24
Table 4 – Example of logistic assignment .30
Table B.1 – Data for the document “system specification".39
Table B.2 – Data for the document "test specification" (assignment of function to
parameter) .
Table B.3 – Database with hardware units and logistic assignment added.42
Table B.4 – Database expanded to include the test steps .43
Table B.5 – Database expanded to include the test paths .44
Table B.6 – Database expanded to include the test task portions .45
Table B.7 – Determination of how many terminals and hardware units there are.46
Table B.8 – Matrix showing coverage of terminals and paths .46
Table B.9 – Determination of the characteristic value for the quality of the fault
recognition (FR) during operation (section A).47
Table B.10 – Determination of the characteristic value for the quality of the fault
recognition (FR) under test conditions (Portions A+B+C+D) .49
Table B.11 – Coverage matrix .50
Table B.12 – Coding of terminals.
...