抽样作业指导书 Sampling Plan for Inspection Instruction

DISTRIBUTION:

Department Organization

1. Purpose 目的

This instruction serves to standardize the sampling standard applying ANSI/ASQC Z1.4 to conduct incoming materials and finish goods inspections, ensuring products meeting quality requirements.

本规程旨在规范使用ANSI/ASQC Z1.4单次抽样法对来料进行抽样检验，确保品质符合规范要求。

2. Scope 适用范围

This document is applicable to the inspection of all production materials and finished goods of *** Company Limited Plant.

本规程适用于***有限公司所有生产物料和成品的检查。

3. Responsibility职责

Quality Manager has the responsibility and authority to implement this procedure wherever sampling is required

品质经理赋予全权负责执行此流程。

4. Definition定义

AQL: Acceptable Quality Level 可接收质量水平。

Ac: Accept 接受

Re: Reject 拒收

CR: Critical 致命缺陷，会对人员造成伤害或火灾等。

MA: Major 严重缺陷，对产品有重大影响的缺陷。

MI: Minor 轻微缺陷，对产品有影响的缺陷。

5. Procedures作业程序

5.1 Inspection Levels 检查水平的规定：

There are three general inspection levels (I, II & III) and four special inspection levels (S-1, S-2, S-3 & S-4).

检查水平分：一般检查水平（I、II、III）和特殊检查水平（S-1、S-2、S-3、S-4）。

may be specified when less discrimination is needed, or Level III may be specified for greater discrimination. Four additional special levels: S-1, S-2, S-3, and S-4, are given in the same table and may be used where relatively small sample sizes are necessary and large sampling risks can or must be tolerated..

除非另有规定，通常采用一般检查水平 II 。当需要的判别力比较低时，可规定使用一般检查水平 I ，当需要的判别力比较高时，可规定使用一般检查水平 III 。特殊检查水平仅适用于必须使用较小的样本，而且能够或必须允许较大的误判风险。

Individual Inspection levels are designated per category of non-conforming in principle, it should be noted that inspection levels correspond with acceptance level of quality.

原则上按不合格的分类分别规定检查水平，但必须注意检查水平与合格质量水平之间的协调一致。

NOTE: In the designation of inspection levels S-1 to S-4, care must be exercised to avoid AQLs inconsistent with these inspection levels.

For example,

To correspond with the maximum sample size of single sampling plan for normal inspection exceeds

8 if sample size did not exceed D in S-1 level.

If specified AQL =0.10, then the smaller sample sizes of single sampling plan for normal inspection is 125, therefore, S-1 shall be not to be used under AQL=0.10.

注：在规定特殊检查水平S-1至S-4时，必须注意避免检查水平同所规定的合格质量水平之间的矛盾。

例如，在S-1中，样本大小字码没有超过 D，相当于正常一次抽样方案样本大小最多等于8。若规定AQL=0.10,则正常检查一次抽样方案的最小样本大小为125。因此，在规定AQL=0.10的情况下，不能规定使用特殊检查水平S-1。

5.2 Normal, Tightened and Reduced Inspection 检查严格度的确定：

Generally, there are three grades for inspection –normal , tightened and reduced.

Normal inspection will be used at the start of inspection unless otherwise directed by the responsible authority.

检查的严格度是指提交批所接受检查的宽严程度，通常规定为---正常检查、加严检查和放宽检查三种不同严格度的检查。除非另有规定，在检查开始时应使用正常检查。

5.3 Switching Procedures 转移规则：

5.3.1 Normal to Tightened 从正常检查到加严检查

When normal inspection is in effect, tightened inspection shall be instituted when 3 out of 5 or fewer consecutive lots or batches have been non-acceptable on original inspection.

当进行正常检查时，若在连续检查五批中有三批以上（不包括再次提交检查批）不合格，则从下一批检查转到加严检查。

5.3.2 Tightened to Normal 从加严检查到正常检查

When tightened inspection is in effect, normal inspection shall be instituted when 5 consecutive lots or batches have been considered acceptable on original inspection.