GB/T 2828.2-2008 in English

《GB/T 2828.2-2008计数抽样检验程序 第2部分：按极限质量LQ检索的孤立批检验抽样方案》由TC21（全国统计方法应用标准化技术委员会）归口，主管部门为国家标准化管理委员会。
GB/T2828.2是一个按极限质量LQ 检索的计数验收抽样检验系统。该抽样系统用于孤立批(孤立序列批,孤立批或是单批)检验,在这里GB/T2828.1的转移规则不适用。GB/T2828本部分提供的抽样方案作为GB/T2828.1的补充,并且与GB/T2828.1兼容。
GB/T2828本部分的方案使用优先数系的极限质量LQ为索引,使用方的风险除了两种情况低于13%外,通常都低于10%。这种检索方法比GB/T2828.1中的极限质量保护的特别程序更方便。

1 Scope
GB/T 2828.2 establishes an acceptance sampling inspection system by attributes indexed by limiting quality (LQ) for isolated lot (isolated series lot, isolated lot or single lot) when the switching rules given in GB/T 2828.1 are not applied. The sampling plans provided by this Part of GB/T 2828 are regarded as the supplement of GB/T 2828.1 and compatible with GB/T 2828.1.
The plans in this Part of GB/T 2828 are indexed by a preferred series of limiting qualities (LQ) with a consumer’s risk usually below 10 %, but only below 13 % in two circumstances. This method of indexing is more convenient than the special procedures for limiting quality protection in GB/T 2828.1.
Note: the plans in GB/T 2828.1 are indexed by a preferred series of AQL values and inspection levels. During the inspection of a continuing series of lots, the application of switching rules helps to ensure that the process average in that series of lots is kept below the specified AQL. Limiting quality does not have the same direct relationship with the process average.
This Part of GB/T 2828 is initially designed for the inspection of nonconforming items, which may also be used for the inspection of nonconformities per 100 items unless LQ values are overlarge. If this Part of GB/T 2828 does not apply, the consumers shall refer to the special procedures for limiting quality protection specified in 12.6.2 of GB/T 2828.1.
Alternative procedures are provided in this Part of GB/T 2828 to cater for two situations often met in practice:
a) Procedure A
Procedure A is to be used when the producer and consumer both wish to regard the lot in isolation. In other words, the uniqueness of lot lies in manufacturing only one lot according to its type.
b) Procedure B
Procedure B is to be used when the producer regards the lot as one of continuing series but the consumer considers the lot received in isolation. In other words, the consumers only receive one lot (or few lots) in the continuous series of lots. Procedure B is stated in Appendix A.

Contents
Foreword i
1 Scope
2 Normative References
3 Terms, Definitions and Symbols
3.1 Terms and Definitions
3.2 Symbols
4 Choice of Sampling Plan
4.1 General Provisions
4.2 Procedure A
4.3 Choice of Limiting Quality (LQ)
4.4 Choice of Inspection Level
4.5 Indexing of Sampling Plan
5 Rules for Acceptance and Non-Acceptance
5.1 Sampling
5.2 Acceptability of Lot
5.3 Disposal of Rejected Lot
5.4 Nonconforming Item
5.5 Resubmission of Lot
6 Examples of Procedure A Application
7 Additional Information
7.1 Main Table
7.2 Auxiliary Tables
Appendix A (Normative) Procedure B Sampling Plan
A.1 Choice for Procedure A and Procedure B
A.2 Procedure B Sampling Plan (Table A.1~Table A.10)
A.3 Acquisition of Sampling Plans
A.4 Supplementary Table
Appendix B (Informative) Relationship Between this Part of GB/T 2828 and Part
B.1 General Comparison
B.2 Difference with Limiting Quality Protection Procedure
Appendix C (Informative) Double and Multiple Sampling Plan
C.1 General Description
C.2 Table
Bibliography