TS EN 61124
Reliability testing - Compliance tests for constant failure rate and constant failure intensity
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design changes; – Discrepancies in test plans A, B as well as Annexes A and B that originated in IEC 60605-7 [3], now withdrawn, have been corrected so these test plans differ from those given in previous editions of IEC 61124.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.
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About This Item
TS EN 61124 is a standard for reliability testing that addresses compliance tests under the assumptions of constant failure rate and constant failure intensity. In practical terms, it helps determine whether a product or system behaves consistently with a target reliability model by using a structured test plan rather than an ad hoc observation. The document covers test procedures for observed failure rate, failure intensity, meantime to failure (MTTF), and mean time between failures (MTBF).
Test plans, operating characteristics and design tools
According to the scope information, the standard provides a number of optimized test plans together with their operating characteristic curves and expected test times. It also includes algorithms for designing test plans with a spreadsheet program, plus guidance on how to choose an appropriate plan. From a general technical perspective, this is important because reliability decisions depend on both the statistical model and the practical constraints of time, sample size and required confidence. The constant failure rate assumption is commonly associated with an exponential reliability model, while failure intensity describes how frequently failures occur over operating time.
What this document adds in context
- It focuses on compliance-style reliability tests rather than a general reliability handbook.
- New and corrected test plans are included, along with guidance for selecting plans and using spreadsheet-based design tools.
- The scope explicitly mentions optimized plans and expected test times, which are central to planning test duration and decision criteria.
- Mathematical background material and spreadsheet information are placed in informative annexes.
- This listing corresponds to EN 61124 / IEC 61124:2012 equivalence, and the edition has been withdrawn.
- Publication Date: 12.06.2013
- Standard Status: H (İptal Edilmiş Standard/Withdrawn standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.120.30 İstatistiksel Metotların Uygulanması; 19.020 Deney Şartları ve Prosedürleri (Genel); 21.020 Makina, Cihaz ve Ekipmanların Özellikleri ve Tasarımı
- Pages: 132
- Source Standard: EN 61124:2012
- International Equivalents: EN 61124-EQV; IEC 61124:2012 (EQV) + corrigendum Jan.-EQV
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