BS-6002-2-2007.pdf
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1、BS 6002-2:2007 Sampling procedures for inspection by variables Part 2: General guide to single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics ICS 03.120.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LA
2、W BRITISH STANDARD Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 06:26:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007
3、ISBN 978 0 580 50164 7 The following BSI references relate to the work on this standard: Committee reference SS/5 Draft for comment 05/30134582 Publication history First published as BS 6002, May 1979 First published as BS 6002-1, November 1993 First published as BS 6002-2, February 2007 Amendments
4、issued since publication Amd. no.DateText affected BS 6002-2:2007 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 06:26:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007i BS 6002-2:2007 Contents Foreword v Introduction 1 1Scope 5 2Normative references 6 3Te
5、rms and definitions 7 4Symbols 10 5Acceptance quality limit (AQL) 12 6Switching rules for normal, tightened and reduced inspection 13 7Relationship to BS 6001-1 and BS 6002-1 14 8Consumer protection 16 9Planning 17 10Choice between variables and attributes 18 11Choice between the “s” and “” methods
6、19 12Choice of inspection level and AQL 19 13Choice of sampling scheme 19 14Preliminary operations 21 15Standard univariate “s” method procedures 21 16Standard multivariate “s” method procedures for independent quality characteristics 30 17Standard univariate “” method procedures 33 18Standard multi
7、variate “” method procedures for independent quality characteristics 37 19Standard multivariate combined “s” and “” method procedures for independent quality characteristics 39 20Procedure during continuing inspection 40 21Normality and outliers 41 22Records 41 23Operation of switching rules 42 24Di
8、scontinuation and resumption of inspection 43 25Switching between the “s” and “” methods 43 Annexes Annex A (normative) Table for determining the sample size code letter 44 Annex B (normative) Form k “s” method single sampling plans 45 Annex C (normative) Form k “” method single sampling plans 48 An
9、nex D (normative) Form p* “s” method single sampling plans 51 Annex E (normative) Form p* “” method single sampling plans 54 Annex F (normative) Values of fs for maximum sample standard deviation (MSSD) 57 Annex G (normative) Values of f for maximum process standard deviation (MPSD) 60 Annex H (norm
10、ative) Estimating the process fraction nonconforming for sample size 3: “s” method 63 Annex I (normative) Values of cu for upper control limit on the sample standard deviation 66 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 06:26:51 GMT+00:00 2007, Uncontroll
11、ed Copy, (c) BSI BS 6002-2:2007 ii BSI 2007 Annex J (normative) Supplementary acceptability constants for qualifying towards reduced inspection 67 Annex K (normative) Procedures for obtaining s and 68 Annex L (normative) Estimating the process fraction nonconforming 70 Annex M (informative) Consumer
12、s risk qualities 75 Annex N (informative) Producers risks 79 Annex O (informative) Operating characteristics for the “” method 83 Bibliography 85 List of tables Table 1 Example results 32 Table 2 Example results with sample standard deviations redesignated as process standard deviations 38 Table 3 E
13、xample results where some of the characteristics have known process standard deviations 40 Table A.1 Sample size code letters and inspection levels 44 Table B.1 Single sampling plans of Form k for normal inspection: “s” method 45 Table B.2 Single sampling plans of Form k for tightened inspection: “s
14、” method 46 Table B.3 Single sampling plans of Form k for reduced inspection: “s” method 47 Table C.1 Single sampling plans of Form k for normal inspection: “” method 48 Table C.2 Single sampling plans of Form k for tightened inspection: “” method 49 Table C.3 Single sampling plans of Form k for red
15、uced inspection: “” method 50 Table D.1 Single sampling plans of Form p* for normal inspection: “s” method 51 Table D.2 Single sampling plans of Form p* for tightened inspection: “s” method 52 Table D.3 Single sampling plans of Form p* for reduced inspection: “s” method 53 Table E.1 Single sampling
16、plans of Form p* for normal inspection: “” method 54 Table E.2 Single sampling plans of Form p* for tightened inspection: “” method 55 Table E.3 Single sampling plans of Form p* for reduced inspection: “” method 56 Table F.1 Values of fs for maximum sample standard deviation for combined control of
17、double specification limits: normal inspection, “s” method 57 Table F.2 Values of fs for maximum sample standard deviation for combined control of double specification limits: tightened inspection, “s” method 58 Table F.3 Values of fs for maximum sample standard deviation for combined control of dou
18、ble specification limits: reduced inspection, “s” method 59 Table G.1 Values of f for maximum process standard deviation for combined control of double specification limits: “” method 60 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 06:26:51 GMT+00:00 2007, Un
19、controlled Copy, (c) BSI BSI 2007iii BS 6002-2:2007 Table G.2 Values of f for maximum process standard deviation (MPSD) for separate control of double specification limits: “” method 61 Table G.3 Values of f for maximum process standard deviation (MPSD) for complex control of double specification li
20、mits: “” method 62 Table H.1 Estimated process fraction nonconforming, p , as a function of the quality statistic Q 63 Table I.1 Values of cu for upper control limit on the sample standard deviation 66 Table J.1 Supplementary acceptability constants for qualifying towards reduced inspection 67 Table
21、 L.1 Values of an for normal approximation to p 72 Table M.1.s Consumers risk quality (in percent) for normal inspection: “s” method 76 Table M.1. Consumers risk quality (in percent) for normal inspection: “” method 76 Table M.2.s Consumers risk quality (in percent) for tightened inspection: “s” met
22、hod 77 Table M.2. Consumers risk quality (in percent) for tightened inspection: “” method 77 Table M.3.s Consumers risk quality (in percent) for reduced inspection: “s” method 78 Table M.3. Consumers risk quality (in percent) for reduced inspection: “” method 78 Table N.1.s Producers risk (in percen
23、t) for normal inspection: “s” method 80 Table N.1. Producers risk (in percent) for normal inspection: “” method 80 Table N.2.s Producers risk (in percent) for tightened inspection: “s” method 81 Table N.2. Producers risk (in percent) for tightened inspection: “” method 81 Table N.3.s Producers risk
24、(in percent) for reduced inspection: “s” method 82 Table N.3. Producers risk (in percent) for reduced inspection: “” method 82 Summary of pages This document comprises a front cover, an inside front cover, pages i to vi, pages 1 to 86, an inside back cover and a back cover. Licensed Copy: London Sou
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