IEC 62058-11:2008

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 l'électricite (c.a.) – Contrôle de réception –
Partie 11: Méthodes générales de contrôle de réception

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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 l'électricite (c.a.) – Contrôle de réception –
Partie 11: Méthodes générales de contrôle de réception

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 17.220; 91.140.50 ISBN 2-8318-9988-5
– 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 Types of inspection .12
3.5 Types of acceptance sampling inspection.14
3.6 Acceptance sampling inspection system aspects.15
3.7 Acceptance criteria.16
3.8 Types of operating characteristic curves.18
3.9 Terms relating to operating characteristics .18
3.10 Outgoing quality concepts .21
3.11 Other terms .21
4 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 Selection 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 inspection.28
5.6.4 Attributes versus variables .28
5.6.5 Single and double sampling.29
5.6.6 “s” method and “σ” method.29
5.7 Nonconformity and nonconforming items .29
5.8 Classification of nonconformities .29
5.9 Operating characteristic (OC) curve .30
5.10 Producer’s risks (PR) and consumer’s risk (CR) .30
5.11 AQL, PRQ, LQ and CRQ .31
5.12 Switching rules for normal, tightened and reduced inspection.31
5.13 Inspection level .32
5.14 Sample size code letter .32
5.15 Place of inspection .33
5.16 Submission of product for acceptance inspection .33
5.17 Drawing of samples .33
5.18 Acceptability of lots .34
6 100 % inspection .34
6.1 Application of the method .34

62058-11 © IEC:2008 – 3 –
6.2 Lot sizes and acceptance numbers.34
6.3 Acceptance and non-acceptance .35
7 Lot-by-lot inspection by attributes .35
7.1 Application of the method .35
7.2 Drawing of samples .36
7.3 Inspection level .36
7.4 Sampling plans.36
7.4.1 Obtaining a sampling plan .36
7.4.2 Single sampling plans.36
7.4.3 Double sampling plans .39
7.4.4 Determination of acceptability.40
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 Operating 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 Consumer’s risk (CR) .47
7.11 Producer’s risk (PR) .49
8 Isolated lot inspection.50
8.1 Application of the method .50
8.2 Procedures specified.50
8.2.1 Procedure 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 inspection .
...