1、 IEC 62058-11 Edition 1.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electricity metering equipment (AC) Acceptance inspection Part 11: General acceptance inspection methods Equipement de comptage de llectricite (c.a.) Contrle de rception Partie 11: Mthodes gnrales de contrle de rception IE
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16、 du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62058-11 Edition 1.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electricity metering equipment (AC) Acceptance inspection Part 11: General acceptance inspection methods Equipement de comp
17、tage de llectricite (c.a.) Contrle de rception Partie 11: Mthodes gnrales de contrle de rception INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XC ICS 17.220; 91.140.50 PRICE CODE CODE PRIX ISBN 2-8318-9988-5 Registered trademark of the International Electrotech
18、nical Commission Marque dpose de la Commission Electrotechnique Internationale 2 62058-11 IEC:2008 CONTENTS FOREWORD.6 INTRODUCTION.8 1 Scope.9 2 Normative references .9 3 Terms and definitions .9 3.1 Sources of data.10 3.2 Types of sampling .11 3.3 Specifications, values and test results.11 3.4 Typ
19、es of inspection .12 3.5 Types of acceptance sampling inspection14 3.6 Acceptance sampling inspection system aspects.15 3.7 Acceptance criteria16 3.8 Types of operating characteristic curves18 3.9 Terms relating to operating characteristics 18 3.10 Outgoing quality concepts .21 3.11 Other terms.21 4
20、 Symbols and abbreviations.22 4.1 Symbols 22 4.2 Acronyms 23 5 General 23 5.1 The objectives of acceptance inspection .23 5.2 Acceptance sampling plans, schemes and systems.24 5.3 Practical and economic advantages of using standard sampling plans 24 5.4 Agreement between the parties .25 5.5 Selectio
21、n of sampling schemes and sampling plans 26 5.6 Considerations influencing a selection.27 5.6.1 Long and short production runs .27 5.6.2 Lot-by-lot inspection 28 5.6.3 Isolated lot inspection28 5.6.4 Attributes versus variables 28 5.6.5 Single and double sampling.29 5.6.6 “s” method and “” method.29
22、 5.7 Nonconformity and nonconforming items .29 5.8 Classification of nonconformities .29 5.9 Operating characteristic (OC) curve 30 5.10 Producers risks (PR) and consumers risk (CR) 30 5.11 AQL, PRQ, LQ and CRQ .31 5.12 Switching rules for normal, tightened and reduced inspection31 5.13 Inspection l
23、evel .32 5.14 Sample size code letter .32 5.15 Place of inspection33 5.16 Submission of product for acceptance inspection 33 5.17 Drawing of samples.33 5.18 Acceptability of lots .34 6 100 % inspection34 6.1 Application of the method34 62058-11 IEC:2008 3 6.2 Lot sizes and acceptance numbers34 6.3 A
24、cceptance and non-acceptance.35 7 Lot-by-lot inspection by attributes.35 7.1 Application of the method35 7.2 Drawing of samples.36 7.3 Inspection level .36 7.4 Sampling plans36 7.4.1 Obtaining a sampling plan .36 7.4.2 Single sampling plans36 7.4.3 Double sampling plans 39 7.4.4 Determination of acc
25、eptability40 7.5 Normal, tightened and reduced inspection (see also 5.12).41 7.5.1 Start and continuation of inspection.41 7.5.2 Normal to tightened .41 7.5.3 Tightened to normal.42 7.5.4 Normal to reduced.42 7.5.5 Reduced to normal 43 7.5.6 Discontinuation and resumption of inspection 43 7.6 Operat
26、ing characteristic (OC) curves.43 7.7 Process average .46 7.8 Average outgoing quality (AOQ) 46 7.9 Average outgoing quality limit (AOQL).46 7.10 Consumers risk (CR) 47 7.11 Producers risk (PR) 49 8 Isolated lot inspection.50 8.1 Application of the method50 8.2 Procedures specified.50 8.2.1 Procedur
27、e A 50 8.2.2 Procedure B 50 8.3 Limiting quality 50 8.4 Procedure A 50 8.5 Procedure B 53 8.6 Rules for acceptance and non-acceptance 55 9 Skip-lot inspection55 9.1 Application of the method55 9.2 Manufacturer qualification .56 9.3 Product qualification56 9.4 Detailed procedures 57 10 Lot-by-lot ins
28、pection by variables .57 10.1 Application of the method57 10.2 Choice between the “s” and the “” methods57 10.3 Standard plans 58 10.4 Preliminary operations.58 10.5 Standard multivariate “s” method procedures for independent quality characteristics with combined control 58 10.5.1 General methodolog
29、y 58 10.5.2 Sampling plans59 10.5.3 Description of the procedure60 10.5.4 Simplified exact formula for the “s” method with sample size 461 4 62058-11 IEC:2008 10.5.5 Approximate procedure for the “s” method for n 5 .61 10.6 Standard multivariate “” method procedures for independent quality character
30、istics with combined control 64 10.6.1 General methodology 64 10.6.2 Sampling plans65 10.6.3 Description of the procedure65 10.7 Procedure during continuing inspection .66 10.8 Normality and outliers66 10.8.1 Normality.66 10.8.2 Outliers .66 10.9 Records 66 10.9.1 Control charts66 10.9.2 Lots that a
31、re not accepted .66 10.10 Normal, tightened and reduced inspection (see also 5.12) 66 10.11 Discontinuation and resumption of inspection .67 10.12 Switching between the “s” and “ ” methods .68 10.12.1 Estimating the process standard deviation 68 10.12.2 State of statistical control 68 10.12.3 Switch
32、ing from the “s” method to the “ ” method68 10.12.4 Switching from the “ ” method to the “s” method69 10.13 Consumer protection 69 10.14 Operating characteristic curves 69 10.15 Consumers risk (CR) .72 10.16 Producer risk (PR) .74 Annex A (normative) Random numbers76 Annex B (normative) Procedure fo
33、r obtaining s or .79 Bibliography80 Figure 1 Selection procedure of sampling schemes and plans .27 Figure 2 Outline of switching rules .32 Figure 3 OC curves for AQL = 1,0, single sampling plans, normal inspection .44 Figure 4 OC curves for AQL = 1,0, single sampling plans, tightened inspection .44
34、Figure 5 OC curves for single sampling plans, Ac=0 45 Figure 6 Operating characteristic curves for single sampling plans for non-critical nonconformities, procedure B .54 Figure 7 OC curves for normal inspection, AQL = 1,0.69 Figure 8 OC curves for tightened inspection, AQL = 1,0.70 Figure 9 OC curv
35、es for reduced inspection, AQL = 1,0.71 Table 1 Acceptance number Ac for 100 % inspection.34 Table 2 Single sampling plans for normal, tightened and reduced inspection, AQL = 1,0.37 Table 3 Example with lot size = 80, inspection level II37 Table 4 Example with lot size = 400, inspection level II38 T
36、able 5 Example with lot size = 800, inspection level III.38 Table 6 Single sampling plans for critical nonconformities Ac = 0.39 Table 7 Double sampling plans for normal, tightened and reduced inspection, AQL = 1,0 .40 62058-11 IEC:2008 5 Table 8 Calculation of switching scores .43 Table 9 Tabulated
37、 values of OC curves for single sampling, AQL = 1,0 plans 45 Table 10 Tabulated values of OC curves for single sampling, normal inspection, accept zero sampling plans.46 Table 11 Average Outgoing Quality Limit (AOQL) at AQL = 1,047 Table 12 Average Outgoing Quality Limit (AOQL) for Ac = 0 sampling p
38、lans, normal inspection .47 Table 13 Consumers risk quality (CRQ): AQL = 1,0 plans .48 Table 14 Consumers risk quality (CRQ): Accept zero plans.48 Table 15 Producers risk (PR): AQL = 1,0 49 Table 16 Producers risk (PR): Accept zero plans 49 Table 17 Sampling plans for non-critical nonconformities, p
39、rocedure A, LQ = 5,0 .51 Table 18 Sampling plans for critical nonconformities, procedure A.52 Table 19 Probability of acceptance for accept zero plans.52 Table 20 Single sampling plans for non-critical nonconformities, procedure B, LQ = 5,0 54 Table 21 Equivalent sample sizes for single and double s
40、ampling55 Table 22 Equivalent acceptance numbers for single and double sampling55 Table 23 Sample sizes for the “s” method and the “” method with AQL = 1,058 Table 24 Sampling plans for the “s” method .60 Table 25 Values of a n .62 Table 26 Sampling plans for the “” method.65 Table 27 Supplementary
41、acceptability constants for qualifying towards reduced inspection .67 Table 28 Values of c Ufor upper control limit on the sample standard deviation 68 Table 29 Tabulated values of OC curves for normal inspection, AQL = 1,0 70 Table 30 Tabulated values of OC curves for tightened inspection, AQL = 1,
42、0.71 Table 31 Tabulated values of OC curves for reduced inspection, AQL = 1,0.72 Table 32 Consumers risk quality (CRQ): “s” method 73 Table 33 Consumers risk quality (CRQ): “” method .73 Table 34 Producers risk (PR): “s” method74 Table 35 Producers risk (PR): “” method .74 Table A.1 Random numbers.7
43、6 6 62058-11 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICITY METERING EQUIPMENT (AC) ACCEPTANCE INSPECTION Part 11: General acceptance inspection methods FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all na
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