{"id":344390,"date":"2024-10-20T00:11:15","date_gmt":"2024-10-20T00:11:15","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-611232020\/"},"modified":"2024-10-25T23:33:25","modified_gmt":"2024-10-25T23:33:25","slug":"bs-en-iec-611232020","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-611232020\/","title":{"rendered":"BS EN IEC 61123:2020"},"content":{"rendered":"

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\u2019s and consumer\u2019s risks (?<\/em>‘, ?<\/em>‘) are given and very close to the nominal (?<\/em>, ?<\/em>); 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<\/p>\n

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2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
6<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
8<\/td>\nFOREWORD <\/td>\n<\/tr>\n
10<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
12<\/td>\n1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions <\/td>\n<\/tr>\n
13<\/td>\n3.2 Abbreviated terms and symbols
3.2.1 Abbreviated terms
3.2.2 Symbols <\/td>\n<\/tr>\n
14<\/td>\n4 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 <\/td>\n<\/tr>\n
15<\/td>\n4.4 General test procedure
4.5 General decision criteria
Figures
Figure 1 \u2013 Expected and maximal number of trials for SPRT and FTFT with the same risks <\/td>\n<\/tr>\n
16<\/td>\nTables
Table 1 \u2013 Overview \u2013 Maximal number of trials and expected number of trials at p0 for SPRT and FTFT <\/td>\n<\/tr>\n
17<\/td>\n5 Truncated sequential probability ratio test plans (SPRT)
5.1 Characteristics
5.2 Decision criteria
Table 2 \u2013 Range of the test parameters <\/td>\n<\/tr>\n
18<\/td>\n5.3 Operating characteristic curve (OC)
Figure 2 \u2013 SPRT diagram
Table 3 \u2013 OC curve <\/td>\n<\/tr>\n
19<\/td>\n5.4 Expected number of trials to decision (ENT)
Figure 3 \u2013 OC curve
Figure 4 \u2013 SPRT \u2013 Curve of expected number of trials to decision (ENT)
Table 4 \u2013 ENT (ne) versus true failure ratio (p) <\/td>\n<\/tr>\n
20<\/td>\n6 Fixed trial\/failure terminated test plans (FTFT)
6.1 Characteristics
6.2 Decision criteria
Table 5 \u2013 Fixed trial\/failure terminated test plans <\/td>\n<\/tr>\n
21<\/td>\n7 Design of fixed trial\/failure terminated test plans
7.1 Characteristics
7.2 Approach <\/td>\n<\/tr>\n
22<\/td>\n7.3 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 <\/td>\n<\/tr>\n
23<\/td>\n7.6.2 Use of figures and tables
7.7 Decision criteria
Figure 5 \u2013 Principal layout of Tables E.1 to E.3 <\/td>\n<\/tr>\n
24<\/td>\nAnnex A (informative)Additional information on sequential test plans
A.1 Example
Figure A.1 \u2013 Example of a truncated sequential test <\/td>\n<\/tr>\n
25<\/td>\nA.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 <\/td>\n<\/tr>\n
27<\/td>\nTable A.1 \u2013 Example for interpolation by \u03b1 and \u03b2 <\/td>\n<\/tr>\n
28<\/td>\nAnnex B (informative)Design of fixed trial\/failure terminated test plans \u2212 Examples
B.1 Use of figures and tables
B.2 Case where number of events, n, is not known, but is predictable <\/td>\n<\/tr>\n
30<\/td>\nAnnex C (informative)Design of fixed trial\/failure terminated test plans \u2013Mathematical procedures and formulas
C.1 General
C.2 Symbols
C.3 Computation
C.3.1 Determination of D versus n <\/td>\n<\/tr>\n
31<\/td>\nC.3.2 Determination of n and c versus p0, D, \u03b1, \u03b2
C.3.3 Test without failures \u2013 Determination of n and D versus p0, \u03b1, \u03b2 <\/td>\n<\/tr>\n
32<\/td>\nC.3.4 Determination of OC curves
C.3.5 Determination of inverse OC curves <\/td>\n<\/tr>\n
33<\/td>\nC.4 Accuracy
C.5 Tables of cumulative normal distribution and its Inverse
Table C.1 \u2013 Cumulative normal distribution for fixed u\u03b3 values <\/td>\n<\/tr>\n
34<\/td>\nTable C.2 \u2013 Inverse cumulative normal distribution for fixed 1 \u2212 \u03b3 values <\/td>\n<\/tr>\n
35<\/td>\nAnnex D (normative)Truncated sequential test plans
Table D.1 \u2013 Truncated sequential test plans <\/td>\n<\/tr>\n
44<\/td>\nAnnex E (informative)Design of fixed trial\/failure terminated test plans \u2013 Figures and tables to determine D and c or n and c
Figure E.1 \u2013 Discrimination ratio, D, versus number of events, n for p0 = 0,05 <\/td>\n<\/tr>\n
45<\/td>\nFigure E.2 \u2013 Discrimination ratio, D, versus number of events, n for p0 = 0,10 <\/td>\n<\/tr>\n
46<\/td>\nFigure E.3 \u2013 Discrimination ratio, D, versus number of events, n for p0 = 0,15 <\/td>\n<\/tr>\n
47<\/td>\nTable E.1 \u2013 Acceptable number of failures, c, versus number of events, n for p0 = 0,05 (1 of 2) <\/td>\n<\/tr>\n
49<\/td>\nTable E.2 \u2013 Acceptable number of failures, c, versus number of events, n for p0 = 0,10 (1 of 2) <\/td>\n<\/tr>\n
51<\/td>\nTable E.3 \u2013 Acceptable number of failures, c, versus number of events, n for p0 = 0,15 (1 of 2) <\/td>\n<\/tr>\n
53<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Reliability testing. Compliance test plans for success ratio<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2020<\/td>\n54<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":344395,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[94,2641],"product_tag":[],"class_list":{"0":"post-344390","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-03-120-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/344390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/344395"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=344390"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=344390"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=344390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}