International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 61124:2012
Title Reliability testing - Compliance tests for constant failure rate and constant failure intensity
Project Number 22707
Abstract/Scope IEC 61124:2012 gives a number of optimized test plans, the corresponding operating characteristic curves and expected test times. In addition the algorithms for designing test plans using a spreadsheet program are also given, together with guidance on how to choose test plans. This standard specifies procedures to test whether an observed value of: failure rate, failure intensity, meantime to failure (MTTF), and mean operating time between failures (MTBF). The main changes with respect to the previous edition are as follows: - A number of new test plans have been added based on the Russian standard GOST R 27.402 [1], and it is intended to align the new edition of MIL-HDBK-781 [2] with this edition. Algorithms for optimizing test plans using a spreadsheet program are given and a number of optimized test plans are listed. Furthermore, emphasis is laid on the fact that the test should be repeated following design changes; - Discrepancies in test plans A, B as well as Annexes A and B that originated in IEC 60605-7 [3], now withdrawn, have been corrected so these test plans differ from those given in previous editions of IEC 61124. As requested by the National Committees, mathematical background material and spreadsheet program information has been moved to informative annexes. In addition, the symbol lists have been divided, so that some annexes have separate lists of symbols; - Guidance on how to choose test plans has been added as well as guidance on how to use spreadsheet programs to create them. Test plans A.1 to A.9 and B.1 to B.13 have been corrected; - Subcluses 8.1, 8.2, 8.3, Clause 9, Annex C, Clauses G.2, I.2, I.3 and Annex J are unchanged, except for updated terminology and references.


Current Stage code 6060
Current Stage code date 2012-08-10
Current Stage code deadline 2013-03-27
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 56
Reference Document IEC 61124:2012 (EQV) + corrigendum Jan. 2013 (EQV)
ICS 03.120.30 - Application of statistical methods
19.020 - Test conditions and procedures in general
21.020 - Characteristics and design of machines, apparatus, equipment
Keywords Reliability; Compliance; Failure; Rate; Intensity
Note Supersedes EN 61124:2006
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2012-08-10 2013-03-27 export to doc file  EN  FR  DE
5099 2012-06-27 2012-07-25  
5060 2012-04-02 2012-04-23 export to doc file  EN
5020 2012-01-27 2012-03-30  
3090 2010-05-28 2010-11-30  
5060 2010-04-12 2010-04-26 export to doc file  EN
5020 2009-11-06 2010-04-09  
1090 2009-11-03 2009-11-06  

Implementation Dates

date of Ratification (DOR) (1) 2012-06-27
date of Availability (DAV) (2) 2012-08-10
date of Announcement (DOA) (3) 2012-09-27
date of Publication (DOP) (4) 2013-03-27
date of Withdrawal (DOW) (5) 2015-06-27


Supersedes EN 61124:2006
Superseded by  
Normative reference (6) IEC 60050-191:1990
IEC 60300-3-5:2001
IEC 60605-2:1994
IEC 60605-4:2001
IEC 60605-6:2007
IEC 61123:1991

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.