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BS IEC 60605-6:2007 2010

BS IEC 60605-6:2007 2010

$189.07

Equipment reliability testing – Tests for the validity and estimation of the constant failure rate and constant failure intensity

Published By Publication Date Number of Pages
BSI 2010 48
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Specifies procedures to verify the assumption of a constant failure rate or constant failure intensity as defined in IEC 60050(191). These procedures are applicable whenever it is necessary to verify these assumptions. This may be due to a requirement or for the purpose of assessing the behaviour in time of the failure rate or the failure intensity. The major technical changes with respect to the previous edition concern the inclusion of corrected formulae for tests previously included in a corrigendum, and the addition of new methods for the analysis of multiple items.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols
11 5 Requirements
6 Test for constant failure rate
6.1 General remark concerning Clause 6
12 6.2 Statistical test for constant failure rate
Figure 1 – Tests for constant failure rate – Chart showing structure of Clause 6
13 Tables
Table 1 – Critical value Ua as a function of a
14 6.3 Probability plot
6.4 Total time on test plot
15 6.5 Hazard plot
16 6.6 Action to be taken if constant failure rate assumption is rejected
17 7 Test for constant failure intensity
7.1 General remark concerning Clause 7
7.2 Test for constant failure intensity for a single repaired item
Figure 2 – Tests for constant failure intensity – Chart showing structure of Clause 7
18 7.3 Test for constant failure intensity for multiple repaired items
19 Table 2 – Computation of times to failure for multiple repaired items
20 7.4 M(t) plot
21 7.5 Action to be taken if the constant failure intensity assumption is rejected
Table 3 – Quantiles for standardized normal distribution
22 Annex A (informative) Examples of the procedures given in this standard
Table A.1 – Twenty ordered times to failure out of 40 tested items
Table A.2 – Accumulated times to failure
23 Table A.3 – Time ordered sequence of failure times
Table A.4 – Accumulated times to failure
24 Table A.5 – Eight times at which item failures occurred
25 Table A.6 – Accumulated times to failure
Table A.7 – Failure data for multiple copy of repaired item
26 Table A.8 – Worksheet for computations
27 Table A.9 – Times to failure from test of non-repaired item
Table A.10 – Worksheet with calculations
28 Figure A.1 – Probability plot to check constancy of failure rate
29 Table A.11 – Ten ordered times with multiple modes
30 Figure A.2 – Hazard plot to examine constancy of failure rate
Table A.12 – Worksheet and calculations
31 Table A.13 – Failure times for three identical items of repaired item
Table A.14 – Worksheet with computations for M(t)
32 Figure A.3 – M(t) plot for three repaired items
Table A.15 – Worksheet with computations for confidence intervals for M(t)
33 Figure A.4 – M(t) plot with 95 % confidence intervals
Table A.16 – Confidence intervals for M(t)
34 Table A.17 – Times to failure
35 Figure A.5 – TTT plot to examine constancy of failure rate
Table A.18 – Worksheet and calculations
36 Annex B (informative) Example of M(t) analysis for field data
37 Figure B.1 – Population of systems in use as function of operational time
38 Figure B.2 – Repair per month as percentage of population in use
39 Figure B.3 – M(t) plot
40 Figure B.4 – M(t) curve with 99 % confidence limits
Figure B.5 – Number of repairs per phone
41 Annex C (informative) Preparation of field data for M(t) analysis
45 Bibliography

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BS IEC 60605-6:2007 2010
$189.07