AS/NZS IEC 61123:2022
Reliability testing - Compliance test plans for success ratio
Standard identically adopts IEC 61123:2019, which defines a procedure to verify if the reliability of an item/system complies with the stated requirements. The requirements are assumed to be specified as the percentage of success (success ratio) or the percentage of failures (failure ratio).
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AS/NZS IEC 61123:2022 Compliance test plans for success ratio
English
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
3.2 Abbreviated terms and symbols
3.2.1 Abbreviated terms
3.2.2 Symbols
4 General requirements and area of application
4.1 Reliability requirement
4.2 Repair and replacement
4.3 Types of test plans
4.3.1 General
4.3.2 Features of the test plan types
4.4 General test procedure
4.5 General decision criteria
5 Truncated sequential probability ratio test plans (SPRT)
5.1 Characteristics
5.2 Decision criteria
5.3 Operating characteristic curve (OC)
5.4 Expected number of trials to decision (ENT)
6 Fixed trial/failure terminated test plans (FTFT)
6.1 Characteristics
6.2 Decision criteria
7 Design of fixed trial/failure terminated test plans
7.1 Characteristics
7.2 Approach
7.3 Common case
7.4 Other cases
7.5 Example of application
7.6 Procedure to determine D and c or n and c
7.6.1 Figure and table readings
7.6.2 Use of figures and tables
7.7 Decision criteria
Annex€A (informative)Additional information on sequential test plans
A.1 Example
A.2 Extension of the test set (through interpolation and extrapolation)
A.2.1 General
A.2.2 Extrapolation for p0 0,001
A.2.3 Interpolation
Annex€B (informative)Design of fixed trial/failure terminated test plans − Examples
B.1 Use of figures and tables
B.2 Case where number of events, n, is not known, but is predictable
Annex€C (informative)Design of fixed trial/failure terminated test plans –Mathematical procedures and formulas
C.1 General
C.2 Symbols
C.3 Computation
C.3.1 Determination of D versus n
C.3.2 Determination of n and c versus p0, D, α, β
C.3.3 Test without failures – Determination of n and D versus p0, α, β
C.3.4 Determination of OC curves
C.3.5 Determination of inverse OC curves
C.4 Accuracy
C.5 Tables of cumulative normal distribution and its Inverse
Annex€D (normative)Truncated sequential test plans
Annex E (informative)Design of fixed trial/failure terminated test plans – Figures and tables to determine D and c or n and c
Bibliography
Figures
Figure 1 – Expected and maximal number of trials for SPRT and FTFT with the same risks
Figure 2 – SPRT diagram
Figure 3 – OC curve
Figure 4 – SPRT – Curve of expected number of trials to decision (ENT)
Figure 5 – Principal layout of Tables E.1 to E.3
Figure A.1 – Example of a truncated sequential test
Figure E.1 – Discrimination ratio, D, versus number of events, n for p0 = 0,05
Figure E.2 – Discrimination ratio, D, versus number of events, n for p0 = 0,10
Figure E.3 – Discrimination ratio, D, versus number of events, n for p0 = 0,15
Tables
Table 1 – Overview – Maximal number of trials and expected number of trials at p0 for SPRT and FTFT
Table 2 – Range of the test parameters
Table 3 – OC curve
Table 4 – ENT (ne) versus true failure ratio (p)
Table 5 – Fixed trial/failure terminated test plans
Table A.1 – Example for interpolation by α and β
Table C.1 – Cumulative normal distribution for fixed uγ values
Table C.2 – Inverse cumulative normal distribution for fixed 1 − γ values
Table D.1 – Truncated sequential test plans
Table E.1 – Acceptable number of failures, c, versus number of events, n for p0 = 0,05 (1 of 2)
Table E.2 – Acceptable number of failures, c, versus number of events, n for p0 = 0,10 (1 of 2)
Table E.3 – Acceptable number of failures, c, versus number of events, n for p0 = 0,15 (1 of 2)
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AS/NZS IEC 61123:2022 Compliance test plans for success ratio
English
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions
3.2 Abbreviated terms and symbols
3.2.1 Abbreviated terms
3.2.2 Symbols
4 General requirements and area of application
4.1 Reliability requirement
4.2 Repair and replacement
4.3 Types of test plans
4.3.1 General
4.3.2 Features of the test plan types
4.4 General test procedure
4.5 General decision criteria
5 Truncated sequential probability ratio test plans (SPRT)
5.1 Characteristics
5.2 Decision criteria
5.3 Operating characteristic curve (OC)
5.4 Expected number of trials to decision (ENT)
6 Fixed trial/failure terminated test plans (FTFT)
6.1 Characteristics
6.2 Decision criteria
7 Design of fixed trial/failure terminated test plans
7.1 Characteristics
7.2 Approach
7.3 Common case
7.4 Other cases
7.5 Example of application
7.6 Procedure to determine D and c or n and c
7.6.1 Figure and table readings
7.6.2 Use of figures and tables
7.7 Decision criteria
Annex€A (informative)Additional information on sequential test plans
A.1 Example
A.2 Extension of the test set (through interpolation and extrapolation)
A.2.1 General
A.2.2 Extrapolation for p0 0,001
A.2.3 Interpolation
Annex€B (informative)Design of fixed trial/failure terminated test plans − Examples
B.1 Use of figures and tables
B.2 Case where number of events, n, is not known, but is predictable
Annex€C (informative)Design of fixed trial/failure terminated test plans –Mathematical procedures and formulas
C.1 General
C.2 Symbols
C.3 Computation
C.3.1 Determination of D versus n
C.3.2 Determination of n and c versus p0, D, α, β
C.3.3 Test without failures – Determination of n and D versus p0, α, β
C.3.4 Determination of OC curves
C.3.5 Determination of inverse OC curves
C.4 Accuracy
C.5 Tables of cumulative normal distribution and its Inverse
Annex€D (normative)Truncated sequential test plans
Annex E (informative)Design of fixed trial/failure terminated test plans – Figures and tables to determine D and c or n and c
Bibliography
Figures
Figure 1 – Expected and maximal number of trials for SPRT and FTFT with the same risks
Figure 2 – SPRT diagram
Figure 3 – OC curve
Figure 4 – SPRT – Curve of expected number of trials to decision (ENT)
Figure 5 – Principal layout of Tables E.1 to E.3
Figure A.1 – Example of a truncated sequential test
Figure E.1 – Discrimination ratio, D, versus number of events, n for p0 = 0,05
Figure E.2 – Discrimination ratio, D, versus number of events, n for p0 = 0,10
Figure E.3 – Discrimination ratio, D, versus number of events, n for p0 = 0,15
Tables
Table 1 – Overview – Maximal number of trials and expected number of trials at p0 for SPRT and FTFT
Table 2 – Range of the test parameters
Table 3 – OC curve
Table 4 – ENT (ne) versus true failure ratio (p)
Table 5 – Fixed trial/failure terminated test plans
Table A.1 – Example for interpolation by α and β
Table C.1 – Cumulative normal distribution for fixed uγ values
Table C.2 – Inverse cumulative normal distribution for fixed 1 − γ values
Table D.1 – Truncated sequential test plans
Table E.1 – Acceptable number of failures, c, versus number of events, n for p0 = 0,05 (1 of 2)
Table E.2 – Acceptable number of failures, c, versus number of events, n for p0 = 0,10 (1 of 2)
Table E.3 – Acceptable number of failures, c, versus number of events, n for p0 = 0,15 (1 of 2)
AS/NZS IEC 61123:2022
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.