TS EN IEC 61123
Reliability testing - Compliance test plans for success ratio
IEC 61123:2019 is intended to define a procedure to verify if a reliability of an item/system complies with the stated requirements. The requirement is assumed to be specified as the percentage of success (success ratio) or the percentage of failures (failure ratio). This document can be used where a number of items are tested (number of trials performed) and classified as passed or failed. It can also be used where one or a number of items are tested repeatedly. The procedures are based on the assumption that the probability of success or failure is the same from trial to trial (statistically independent events). Plans for fixed trial/failure terminated tests as well as truncated sequential probability ratio tests (SPRTs) are included. This document contains extensive tables with ready-to-use SPRT plans and their characteristics for equal and non-equal risks for supplier and customer. In the case of the reliability compliance tests for constant failure rate/intensity, IEC 61124 applies. This second edition cancels and replaces the first edition published in 1991. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: The sequential probability ratio test (SPRT) [1, 2][1] has been significantly developed in recent years [3, 4, 5]. This edition contains shorter and accurate tests, a wide range of test plans, and significant additional characteristic data, as follows: the tests are significantly truncated (the maximum trial numbers are low) without substantially increasing the expected number of trials to decision (ENT); the true producer’s and consumer’s risks (?’, ß’) are given and very close to the nominal (?, ß); the range of the test parameters is wide (failure ratio, risks and discrimination ratio); the test plans include various risk ratios (not restricted to equal risks only); the values of ENT are accurate and given in the relevant region (for practical use); guidelines for extension of the test sets (interpolation and extrapolation) are included. In Annex C, the use of the cumulative binomial distribution function of Excel that simplifies the procedure of designing has been added (Clause C.3). Keywords: verify if a reliability of an item/system complies with the stated requirements
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About This Item
TS EN IEC 61123 is the Turkish adoption of a standard that sets out compliance test plans for judging whether an item or system meets stated reliability requirements using a success-ratio or failure-ratio basis. It is aimed at cases where trial outcomes are classified as pass or fail, and also at situations where one or more items are tested repeatedly.
The procedures are built on a common reliability-testing assumption: the probability of success or failure remains the same from trial to trial, with statistically independent events. In practical terms, this means the standard supports both fixed-trial or fixed-failure-terminated plans and truncated sequential probability ratio tests. It also provides ready-to-use plans and their characteristics for equal and non-equal supplier/customer risks, helping users balance acceptance confidence and rejection risk in a structured way.
How the test-planning approach works
In reliability compliance testing, the objective is not merely to observe performance, but to make a decision against pre-set acceptance criteria. A success ratio expresses the share of successful trials in the test set, while a failure ratio expresses the complementary share of failures. This makes the standard relevant wherever a stated reliability target must be checked through a controlled number of trials and a defined decision rule. In general technical use, such plans are common in acceptance testing, qualification and verification contexts.
Document boundaries and revision features
- For compliance tests involving constant failure rate or intensity, the scope points users to IEC 61124 instead of this document.
- This edition is a second edition and replaces the 1991 first edition.
- The tables include practical SPRT plans, risk characteristics, and guidance for extending test sets by interpolation or extrapolation; Annex C adds use of Excel’s cumulative binomial distribution function for plan design.
- Publication Date: 19.03.2020
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.120.01 Kalite (Genel) ; 03.120.30 İstatistiksel Metotların Uygulanması; 21.020 Makina, Cihaz ve Ekipmanların Özellikleri ve Tasarımı
- Pages: 59
- Source Standard: EN IEC 61123:2020
- International Equivalents: EN IEC 61123-EQV; IEC 61123-EQV
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