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 addresses compliance test plans based on success ratio for checking whether an item or system meets declared reliability requirements. In practical terms, it provides a statistical decision framework for cases where the requirement is expressed as a percentage of successes or, equivalently, a percentage of failures. The standard is about verifying reliability claims through observed trial outcomes, so that pass/fail evidence can be used to support an acceptance decision.
How the test plans are organised
The document includes both fixed-trial, failure-terminated plans and truncated sequential probability ratio tests (SPRTs). In general technical terms, these plans assume that the probability of success or failure remains the same from one trial to the next and that the events are statistically independent. That assumption is central to reliability testing because it allows results to be interpreted with a defined acceptance rule rather than by informal judgement. The scope also states that ready-to-use SPRT plans are provided with characteristics for equal and non-equal supplier/customer risks.
Where this standard fits in reliability verification
It can be used when a number of items are tested and classified as passed or failed, as well as when one item or a small number of items are tested repeatedly. This makes the standard relevant to reliability demonstration and compliance testing where the question is not how a product is designed, but whether its observed performance supports the stated requirement. For constant failure rate or failure intensity compliance tests, the scope points instead to IEC 61124, so the two standards serve related but different reliability-testing needs.
This second edition replaces the first edition from 1991 and is identified as a technical revision. According to the scope, it brings shorter tests, a wider range of test plans, more accurate ENT values in the relevant region, and additional guidance for extending test sets by interpolation and extrapolation. Overall, it is a practical reliability-planning standard for structuring acceptance decisions under a quantified statistical risk model.
- 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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