ELECTRICITY METERING EQUIPMENT (AC) - ACCEPTANCE INSPECTION - PART 11: GENERAL ACCEPTANCE INSPECTION METHODS
International Electrotechnical Committee
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
3.1 Sources of data
3.2 Types of sampling
3.3 Specifications, values and test results
3.4 Types of inspection
3.5 Types of acceptance sampling inspection
3.6 Acceptance sampling inspection system aspects
3.7 Acceptance criteria
3.8 Types of operating characteristic curves
3.9 Terms relating to operating characteristics
3.10 Outgoing quality concepts
3.11 Other terms
4 Symbols and abbreviations
4.1 Symbols
4.2 Acronyms
5 General
5.1 The objectives of acceptance inspection
5.2 Acceptance sampling plans, schemes and systems
5.3 Practical and economic advantages of using standard
sampling plans
5.4 Agreement between the parties
5.5 Selection of sampling schemes and sampling plans
5.6 Considerations influencing a selection
5.6.1 Long and short production runs
5.6.2 Lot-by-lot inspection
5.6.3 Isolated lot inspection
5.6.4 Attributes versus variables
5.6.5 Single and double sampling
5.6.6 's' method and 'sigma' method
5.7 Nonconformity and nonconforming items
5.8 Classification of nonconformities
5.9 Operating characteristic (OC) curve
5.10 Producer's risks (PR) and consumer's risk (CR)
5.11 AQL, PRQ, LQ and CRQ
5.12 Switching rules for normal, tightened and reduced
inspection
5.13 Inspection level
5.14 Sample size code letter
5.15 Place of inspection
5.16 Submission of product for acceptance inspection
5.17 Drawing of samples
5.18 Acceptability of lots
6 100 % inspection
6.1 Application of the method
6.2 Lot sizes and acceptance numbers
6.3 Acceptance and non-acceptance
7 Lot-by-lot inspection by attributes
7.1 Application of the method
7.2 Drawing of samples
7.3 Inspection level
7.4 Sampling plans
7.4.1 Obtaining a sampling plan
7.4.2 Single sampling plans
7.4.3 Double sampling plans
7.4.4 Determination of acceptability
7.5 Normal, tightened and reduced inspection
7.5.1 Start and continuation of inspection
7.5.2 Normal to tightened
7.5.3 Tightened to normal
7.5.4 Normal to reduced
7.5.5 Reduced to normal
7.5.6 Discontinuation and resumption of inspection
7.6 Operating characteristic (OC) curves
7.7 Process average
7.8 Average outgoing quality (AOQ)
7.9 Average outgoing quality limit (AOQL)
7.10 Consumer's risk (CR)
7.11 Producer's risk (PR)
8 Isolated lot inspection
8.1 Application of the method
8.2 Procedures specified
8.2.1 Procedure A
8.2.2 Procedure B
8.3 Limiting quality
8.4 Procedure A
8.5 Procedure B
8.6 Rules for acceptance and non-acceptance
9 Skip-lot inspection
9.1 Application of the method
9.2 Manufacturer qualification
9.3 Product qualification
9.4 Detailed procedures
10 Lot-by-lot inspection by variables
10.1 Application of the method
10.2 Choice between the 's' and the 'sigma' methods
10.3 Standard plans
10.4 Preliminary operations
10.5 Standard multivariate 's' method procedures for
independent quality characteristics with combined
control
10.5.1 General methodology
10.5.2 Sampling plans
10.5.3 Description of the procedure
10.5.4 Simplified exact formula for the 's' method with
sample size 4
10.5.5 Approximate procedure for the 's' method for
n >= 5
10.6 Standard multivariate ' s' method procedures for
independent quality characteristics with combined
control
10.6.1 General methodology
10.6.2 Sampling plans
10.6.3 Description of the procedure
10.7 Procedure during continuing inspection
10.8 Normality and outliers
10.8.1 Normality
10.8.2 Outliers
10.9 Records
10.9.1 Control charts
10.9.2 Lots that are not accepted
10.10 Normal, tightened and reduced inspection
10.11 Discontinuation and resumption of inspection
10.12 Switching between the 's' and 'sigma' methods
10.12.1 Estimating the process standard deviation
10.12.2 State of statistical control
10.12.3 Switching from the 's' method to the 'sigma'
method
10.12.4 Switching from the 'sigma' method to the 's'
method
10.13 Consumer protection
10.14 Operating characteristic curves
10.15 Consumer's risk (CR)
10.16 Producer' risk (PR)
Annex A (normative) Random numbers
Annex B (normative) Procedure for obtaining s or sigma
Bibliography
Applies to newly manufactured electricity meters produced and supplied in lots of 50 and above.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 13 |
