This part of GB/T 2828 specifies general skip-lot sampling procedures for acceptance inspection by attributes. The purpose of these procedures is to provide a way to reduce the amount of inspection for high-quality products submitted by suppliers with a satisfactory quality assurance system and effective quality control. The reduction in the amount of inspection is achieved by randomly determining with a specified probability whether the batch submitted for inspection can be accepted without inspection. These procedures extend the principle of random selection of sample units used in GB/T 2828.1 to random selection of batches. The skip-lot sampling procedures specified in this part of GB/T 2828 are applicable to (but not limited to) the following inspections: --- final products, such as complete machines or parts; --- components and raw materials; --- work in progress. GB/T 2828.3-2008 Sampling inspection procedures for attributes Part 3: Skip-lot sampling procedures GB/T2828.3-2008 standard download decompression password: www.bzxz.net
This part of GB/T2828 specifies general skip-lot sampling procedures for attribute acceptance inspection. The purpose of these procedures is to provide a way to reduce the amount of inspection for high-quality products submitted by suppliers with a satisfactory quality assurance system and effective quality control. The reduction in the amount of inspection is achieved by randomly determining with a specified probability whether the batch submitted for inspection can be accepted without inspection. These procedures extend the principle of random selection of sample units used in GB/T2828.1 to random selection of batches. The skip-lot sampling procedure specified in this part of GB/T 2828 applies to (but is not limited to) the following inspections: ---final products, such as complete machines or parts; ---components and raw materials; ---work in progress.
GB/T2828 "Sampling procedures for inspection by attributes" currently includes the following parts. Its structure and corresponding international standards and national standards to be replaced are:
--- Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (ISO 2859-1:1999, IDT; replaces GB/T2828-1987)
--- Part 2: Sampling plan for isolated batch inspection based on limiting quality (LQ) (ISO 2859-2:1985, NEQ; replaces GB/T15239-1994)
--- Part 3: Skip batch sampling procedure (ISO2859-3:2005, IDT; replaces GB/T13263-1991)
---Part 4: Procedure for assessment of claimed quality level (ISO 2859-4:2002, MOD; replaces GB/T 14437-1997 and GB/T 14162-1993)
---Part 5: System of sequential sampling plans for batch inspection based on acceptance quality limit (AQL) (corresponding to ISO 2859-5:2005)
---Part 10: Introduction to sampling systems by attributes (corresponding to ISO 2859-10:2006)
---Part 11: Procedure for assessment of claimed quality level of small populations (replaces GB/T 15482-1995)
This part is Part 3 of GB/T 2828.
This part of GB/T2828 is equivalent to the international standard ISO2859-3:2005 "Sampling inspection procedures for attributes Part 3: Skip lot sampling procedures", and the following corrections are made to ISO2859-3:2005:
--- 6.3.4 Example 3 corrects 14 batches accepted after inspection to 11 batches accepted after inspection.
This part replaces GB/T13263-1991 "Sampling inspection procedures for skip lot attributes". Compared with GB/T 13263-1991, the changes in the technical content of this part mainly include:
--- Cancelled the service items, data or records, management procedures, etc. in the scope of application;
--- Made more detailed provisions on the restrictions of the GB/T 2828.1 sampling plan used, and allowed the use of multiple sampling plans with the first acceptance number as a numerical value (not #);
--- Introduced the concept of qualification score, which is used to determine the relevant qualification appraisal, change of skip inspection frequency, skip inspection interruption, disqualification and requalification, etc., to replace the requirements of Table 1 and Table 2 of GB/T 13263-1991 on the minimum cumulative sample size and judgment number in the acceptance batch;
--- Changed the "if the requalification fails within 10 batches, the product will be disqualified from skipping the batch" to "if the requalification fails within 6 batches, the product will be disqualified from skipping the batch";
--- Added Appendix A and Appendix B.
Appendix A and Appendix B of this part are normative appendices; Appendix C is an informative appendix.
This part is proposed and managed by the National Technical Committee for Standardization of Statistical Methods.
Drafting units of this part: Institute of Mathematics and Systems Science, Chinese Academy of Sciences, China National Institute of Standardization, and PLA Ordnance Engineering College.
Main drafters of this part: Feng Shiyong, Ding Wenxing, Wang Haiying, Yu Zhenfan, Chen Yuzhong, Zhang Yuzhu, Xiao Hui. The
previous versions of the standards replaced by this part are:
---GB/T13263-1991.
The clauses in the following documents become the clauses of this part through reference in this part of GB/T2828. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions apply to this part.
GB/T2828.1-2003 Sampling procedures for inspection by attributes Part 1: Sampling plans for batch inspection indexed by acceptance quality limit (AQL) (ISO2859-1:1999, IDT)
ISO3534-1:2006 Statistical vocabulary and symbols Part 1: General statistical terms and terms used in probability
ISO3534-2:2006 Statistical vocabulary and symbols Part 2: Applied statistics
Foreword III
1 Scope 1
2 Normative references 1
3 Terms, definitions and symbols 1
3.1 Terms and definitions 1
3.2 Symbols and abbreviations 2
4 General requirements 3
5 Qualification of suppliers and products 3
5.1 Qualification of suppliers 3
5.2 Product Qualification 4
5.3 Qualification Score 4
5.4 Example of Product Qualification 6
6 Skip Lot Sampling Procedure 6
6.1 General 6
6.2 Initial Skip Inspection Frequency and Determination 8
6.3 Skip Inspection Frequency and Changes 8
6.4 Sampling plan, lot selection and inspection procedures (state 2 and state 3) 11
6.5 Lot skipping interruption 12
6.6 Requalification 12
6.7 Cancellation of product qualification 13
6.8 Cancellation and suspension of supplier qualification 13
7 Supplier’s responsibilities 13
8 Responsibilities of the inspection body and responsible department 14
8.1 General 14
8.2 Responsibility for supplier qualification 14
8.3 Other responsibilities 14
9 Conformity and coordination with GB/T 2828.1 15
9.1 Restrictions 15
9.2 Relationship with relaxed inspection 15
10 Additional information 15
10.1 Design basis 15
10.2 Statistical characteristics of the skip batch procedure 15
Appendix A (normative) Optional requirements agreed upon before qualification 17
Appendix B (normative) Procedure for random selection of batches at a specified skip inspection frequency 18
Appendix C (informative) Factors determining whether to choose skip batch inspection or relaxed inspection 19
References 20

ICS03.120.30
National Standard of the People's Republic of China
GB/T 2828.3—2008/ISO 2859-3:2005 replaces GB/T13263—1991
Sampling procedures for inspection by attributes—Part 3: Skip-lot sampling procedures(ISO 2859-3.2005,IDT)
Issued on 16 July 2008
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 1 January 2009
2 Normative references
3 Terms, definitions and symbols
3. 1 3.2 Symbols and abbreviations
General requirements
5 Qualification of suppliers and products
5.1 Qualification of suppliers
5.2 Qualification of products
5.3 Qualification score
5.4 Example of product qualification
6 Skip-lot sampling procedures
6.1 General
Initial skip-lot frequency and its determination
Skip-lot frequency and changes
Sampling plan, selection and inspection procedures for lots (status 2 6.5 Batch interruption
6.6 Requalification...
6.7 Cancellation of product qualification...
6.8 Cancellation and suspension of supplier qualification
Supplier's claim
8 Responsibilities of inspection agencies and responsible departments
8.1 General...
8.2 Responsibility for supplier qualification
8.3 Other responsibilities-
9 Conformity and coordination with GB/T 2828.1 9.1 Restrictions
9.2 Relationship with relaxed inspection
10 Additional information
[0.「 Design basis
10.2 Statistical characteristics of the skip batch procedure
Appendix A (normative appendix)
Appendix B (normative appendix)
Appendix C (informative appendix)
References
Optional requirements agreed upon before qualification Procedure for random selection of batches according to the specified skip inspection frequency Factors determining whether to choose skip batch inspection or to relax inspection - IKANIKAca
GB/T2828.3—20 08/ISO2859-3.200512
GB/T2828.3—2008/ISO2859-3:2005GB/T2828 Inspection procedures by attributes sampling currently includes the following parts. Its structure and corresponding international standards and the national standards to be replaced are as follows:
Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (IS() 2859-1: 1999, IDT; replaces GB/T 2828-1987)
Part 2: Sampling plan for isolated batch inspection based on limit quality (LQ) (ISO28a9-2:1985, NEQ; replaces GB/T15239-1994)
Part 3: Skip batch sampling procedure (ISO2859-3:2005, IDT; replaces GI3/T13263-1991) Part 4: Procedure for assessing the water content of claimed quality (ISO2859-4:2002.MOD: replaces GB/T14437-1997 and GB/T 14162 1993)
Part 5: System of sequential sampling plans for batch inspection based on acceptance quality limit (AQL) (corresponding to ISO2859-5:2005)Part 10: Introduction to sampling systems by attributes (corresponding to ISO2859-10:2006)Part 11: Procedure for assessing the quality level of small populations (replaces GB/T15482·1995)This part is Part 3 of GB/T2828.
This part of GB/T2828 is equivalent to the international standard ISO2859-3:2005 "Sampling inspection procedures for attributes Part 3: Skip-batch sampling procedures". The following changes are made to ISO2859-3, 2005: In Example 3 of 6.3.4, "14 batches were accepted after inspection" is corrected to "another 11 batches were accepted after inspection". This part replaces GB/T13263·1991 "Sampling inspection procedures for skip-batch attributes". Compared with GB/T13263-1991, the technical content of this part mainly includes the following changes:
The service items, data or records, management procedures, etc. are cancelled in the scope of application; the restrictions on the sampling plan of GB/T2828.1 used are stipulated in more detail, and the multiple sampling plan with the first number of acceptances as a numerical value (not "#\") is allowed to be used; ... the concept of escape qualification score is introduced to determine the change of the frequency of skip inspection of qualification appraisal, skip inspection interruption, cancellation of registration and re-qualification, etc., to replace the requirements of Table 1 and Table 2 of GB/T13263-1991 on the minimum cumulative sample size and judgment number in the acceptance batch;
- The "within 10 batches" is replaced by "If the requalification is not successful, the product will be disqualified from skipping batches" is changed to "If the requalification is not successful within 6 batches, the product will be disqualified from skipping batches"; Appendix A and Appendix B are added.
Appendices A and B of this part are normative appendices; Appendix C is an informative appendix. This part was proposed and submitted by the National Technical Committee for Standardization of Statistical Methods Application. Drafting units of this part: Institute of Mathematics and Systems Science, Chinese Academy of Sciences, China National Institute of Standardization, and PLA Academy of Mechanical Engineering.
The main drafters of this part are Feng Shiyong, Ding Wenxing, Xia Haiying, Yu Zhenfan, Chen Yuzhong, Zhang Yuzhu, and Xiao Hui. The previous versions of the standards replaced by this part are: GB/T 13263-1991.
1 Scope
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GB/T 2828.3—2008/ISO 2859-3:2005 Sampling procedures for inspection by attributes
Part 3: Skip-batch sampling procedures
This part of GB/T2828 specifies general skip-batch sampling procedures for acceptance inspection by attributes. The purpose of these procedures is to provide a way to reduce the amount of inspection for high-quality products submitted by suppliers with a satisfactory quality assurance system and effective quality control. The reduction in the amount of inspection is achieved by randomly determining, with a specified probability, whether a batch submitted for inspection can be accepted without inspection. These procedures extend the principle of random capture of sample units used in GB/T2828.1 to random selection of batches. The skip-batch sampling procedures specified in this part of GB/T2828 apply to (but are not limited to) the following inspections: final products, Such as complete machines or parts;
—Components and raw materials;
Work-in-progress.
2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of GB/T 2828. For any dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties that reach an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced documents, the latest versions shall apply to this part.
GI3/T2828.1--2003 Sampling inspection procedures for attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (ISO 2859-1:1999, DT)
1S03534-1:2006 Statistical vocabulary and symbols Part 1: - Statistical terms and terms used in probability ISO 3534-2:2006 Statistical vocabulary and symbols Part 2: Applied statistics 3 Terms, definitions and symbols
GB/T 2828.12003, [ISO 3531-1:2006 and ISO 3531 2:2006 and the following terms, definitions and symbols apply to this part of GB/T 2828. For ease of reference, some terms are directly quoted from the above standards: 3.1 Terms and definitions
Continuous production continuous production Production at a steady production rate. NOTE Production is considered continuous if it has continued for a specified production period at a specified production frequency (see 5.2.1). Continuous production is considered to be a stable factor in the manufacturing or assembly process and 3.1.2
disqualification
disqualifies the product from skip lot sampling (3.1.11). 3. 1.3
Inspection agency
Independent third party responsible for inspection and qualification assessment. GB/T 2828.3--2008/IS0 2859-3:20053.1.4
Inspection frequency
The probability that a batch will be inspected.
Note: The inspection frequencies specified in this part of GB/T2828 are 1/2, 1/3, 1/4 and 1/5.3.1.5
Interruption
Suspension of skip lot sampling inspection (3.1.11). After suspension, it is possible to return to skip lot sampling inspection or return to batch inspection. 3.1.6
lot-by-lot inspection Inspection of each batch of products submitted in the form of a series of batches Note 1: In this part, samples (or groups of samples) are drawn from each batch and inspected according to the acceptance attribute sampling procedure specified in B/T 2828.1. Note 2: In this part, lot-by-lot inspection is used in both status 1 (qualification stage) and status 3 (skip lot interruption status) (see 6.1). 3.1.7
product qualification assessment to determine whether the product is suitable for skip lot sampling inspection (3.1.11). 3.1.8
qualification score
A variable number reflecting the quality history up to the date calculated according to given rules, used for qualification, change of skip inspection frequency (3.1.4), interruption (3.1.5), disqualification (3.1.2) and requalification (3.1.9). 3.1.9
requalification
regularification
qualification assessment for reinstatement of skip lot sampling inspection (3.1.11). 3.1.10
responsible authority a person (or group of persons) who has the responsibility and authority to manage the inspection system. Note: In this part of GB/T 2828, the responsible authority is responsible for the qualification and review of suppliers, for determining various inferences and for judging the transition between different inspection stages.
skip-lot sampling inspection skip-lot sampling inspection A sampling inspection procedure whereby some lots in a series of consecutive lots are accepted without inspection when the results of the most recent sampling of a specified number of lots meet specified criteria Note: The lots to be inspected are randomly selected according to a specified inspection frequency. For example, a skip inspection frequency of 1/2 means that the number of lots inspected is, on average, 1/2 of the number of lots submitted
supplier qualification supplierqualification Assessment of a supplier's ability to use skip-lot sampling inspection (3.1.11). 3.2 Symbols and abbreviations
The symbols and abbreviations used in this part of GB/T 2828 are as follows: AcAcceptance number
AcAcceptance number of a primary sampling plan corresponding to a secondary sampling plan AcThe first acceptance number in a secondary or multiple sampling plan Ac2The second acceptance number in a secondary or multiple sampling plan dNumber of nonconforming products or nonconforming number in a sample TableNumber of lots involved in the skip inspection frequency (skip inspection frequency is 1/) Sample size
4General requirements
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GB/T 2828.3—2008/ISO 2859-3:20054.1 Skip lot inspection is only used when both the supplier and the product are qualified for skip inspection. The requirements for these qualifications are given in Clause 5. NOTE: The skip lot sampling procedure specified in this part is different from the skip lot sampling plan of Dxdge, see reference L1], [2] and [3]. 4.2 This part is a supplement to the sampling system of GB/T 2828.1 and should be used in conjunction with GB/T 2828.1. Unless otherwise specified in this part, all clauses of GB/T 2828.1 are applicable. ISO 2859-10 provides useful information for the application of the GB/T 2828 series of standards. 4.3 The skip lot sampling procedure specified in this part is only applicable to continuous batch series and not to batch batches. All batches in the continuous batch series are expected to have similar quality, and there is reason to believe that the uninspected batches have the same quality as the inspected batches. 4.4 If skip lot sampling is more cost-effective, skip lot sampling can be used instead of relaxed inspection (see 9.2 and Appendix C), but its application and transfer rules are different from the relaxed inspection in GB/T 2828.1. 4.5 There are some restrictions when using the skip lot sampling procedure (see 9.1). 4.6 When different acceptance quality limits (AQL) are specified for two or more nonconforming categories or classes, special care should be taken to ensure that the standard is used correctly (see 5.2.2 to 6.6 and 10.2). 4.7 Inspection may be carried out at either the supplier or the purchaser, or at any stage in the production process. 4.8 Since each product has its own environment and characteristics, a number of optional requirements are provided to the supplier and the responsible department to meet these specific conditions. The choice of these and the specific design results should be recorded in the document. 4.9 With the consent of the purchaser, this standard may be referenced in the purchase contract, inspection procedure or other contract documents. 4.10 The "responsible department" and "inspection body" shall be specified in the above documents. This standard assumes that batch inspection and qualification are performed by an independent third party inspection body, but the purchaser may perform them. In certain specific circumstances, the term "inspector (such as the purchaser's representative)" or "assessment team" shall be used instead of "inspection body". 5 Qualification of suppliers and products
5.1 Qualification of suppliers
5.1.1 Requirements for supplier qualifications
Requirements for supplier qualifications are as follows:
The supplier shall have established and kept up to date with documents for controlling product quality and design changes. The documents shall include records of inspections and inspection results for each ay
batch of products produced by the supplier. b) The supplier shall have a system that can detect and correct deviations in quality levels and monitor process changes that may have an adverse effect on quality. The supplier's personnel responsible for the system shall have a clear understanding of the standards, systems and procedures to be followed. The supplier has not made any changes that have an adverse effect on product quality. e
5.1.2 Assessment of supplier qualifications
Organize an assessment team to be responsible for the assessment of supplier qualifications. When the assessment is undertaken by the inspection body, Chapter 8 gives a typical example of the inspection tasks and responsibilities of the assessment team. When the purchaser is responsible for the supplier's qualification assessment, the responsibilities of the assessment team are similar to those when the assessment is undertaken by the inspection body. If the supplier has been qualified for another similar product, the responsible department shall take this fact into account when deciding to what extent additional assessment of the supplier's qualifications should be carried out.
The responsible department shall decide whether the supplier is qualified for skip batch inspection after reviewing the assessment results (see 8.2). The supplier's assessment and registration of the product category to which the product belongs in accordance with the third-party assessment standard GB/T19001 should be taken into account when deciding the applicability of skip batch inspection.
5.1.3 Review of supplier qualifications
The supplier's qualifications should be reviewed regularly. The review period shall be agreed upon by the supplier and the responsible department. The purpose of the review is to confirm whether the supplier can still understand and follow the quality control procedures.
GB/T 2828.3—2008/IS0 2859-3:2005The review method is similar to the assessment method and can be simplified to one inspector replacing the assessment team to complete it. 5.2 Product Qualification
5.2.1 General requirements for product qualification
General requirements for product qualification are as follows:
a) The product should have a stable design.
b) The product should not have any fatal unqualified categories or unqualified categories: the set AQL should be at least 0.025 (%), and the set inspection level should be the general inspection level I, II or III (see c
GB/T 2828. 1--2003).
d) During the qualification stage, product inspection should be in the state of normal inspection, relaxed inspection or a combination of the two (see GB/T2828.1-2003). Products that have been subjected to strict inspection at any time during this stage are not eligible for skip batch inspection. c) Products should be produced in a basically continuous production state within a specified production cycle and at a specified production frequency. The minimum production period and minimum production frequency should be specified on the basis of the agreement between the supplier and the responsible department. If no minimum production cycle is specified, this value should be set to 6 months. If the production is interrupted for one day during the identification period, this period should be calculated from the resumption of production. If no minimum production frequency is specified, this value should be set to once a month, or at least one batch should be submitted every month. If the supplier and the responsible department agree, products that are essentially similar but shipped to different customers can be considered to be "basically continuously produced". I) Product quality should be maintained at AQI or better levels (see GB/T2828.1-2003) within a stable period agreed by the supplier and the responsible department. If no such period is specified, 6 months should be used as the period. 5.2.2 Special requirements for product qualification
5.2.2.1 Special requirements for product qualification are as follows: a) 10 or more batches are accepted for initial inspection in succession. The results of resubmitted batches should not be included in the "initial inspection"; b)
The qualification scores (see 5.3) in 20 consecutive batches reach or exceed 50 points: it is recommended that if the qualification stage exceeds 20 batches, only the recalculated qualification scores of the latest 20 batches should be used.
5.2.2.2 There are the following restrictions on the sampling plans that can be used: a) The sampling plan of fractional acceptance number should not be used (see Chapter 13 of GB/T2828.1--2003); b) Only multiple sampling plans with the first acceptance number as a numerical value are allowed. 5.2.3 Evaluation of product qualification
The evaluation of product qualification should not precede the evaluation of supplier qualification, but one can be carried out simultaneously. The assessment of product qualifications shall be carried out by an assessment team, or by a substitute inspector or inspection body. When the inspection body undertakes the assessment, a typical example of inspection tasks and division of responsibilities is given in Chapter 8 and Appendix A. When the purchaser undertakes the supplier's qualification assessment, the qualifications of the assessment team are similar to those when the inspection body undertakes the assessment. The responsible department shall decide whether the product is qualified for skip batch inspection after reviewing the assessment results (see 8.3). The assessment of product qualifications should be carried out frequently, even in the case where the supplier has obtained GB/T19000 quality management system certification. 5.2.4 Review of product qualifications
Product qualifications should be reviewed regularly by the supplier and the responsible department, the purpose of which is to confirm whether the product continues to comply with the quality control procedures. The review of product qualifications should be carried out at the same time as the review of supplier qualifications. The review method is similar to the assessment method, but can be simplified by using a police officer instead of the assessment team to complete it (see 8.3). 5.3 Qualification score
5.3. 1 General
Qualification score is not only used for qualification appraisal, but also for judging the change of skip inspection frequency, interruption of procedure, requalification and cancellation of qualification. The given rules apply to each state. In the case of inspection of the number of non-conforming products per hundred units, the word "non-conforming product" in the following rules should be replaced by "non-conforming". 5.3.2 Normal inspection single sampling plan
The rules for calculating the normal inspection secondary sampling rolling qualification score are as follows:..
a) Sampling plan with Ac≥3
-If the AQL is tightened by two levels, the batch is accepted and the qualification score is increased by 5;-KANiKAca
CB/T 2828.3—2008/ISO2859-3:2005—When the AQL is tightened by level -, the batch is accepted, but when the AQL is tightened by level 2, it is not accepted, and the qualification score is increased by 3; in any other case, the qualification score is reset to 0. b) Sampling plan with Ac=2
If the batch is accepted and the number of nonconforming items in the sample is 0, the qualification score is increased by 5; -. If the batch is accepted and the number of nonconforming items in the sample is 1, the qualification score is increased by 3; --- In any other case, the qualification score is reset to 0. c) Sampling plan with Ac1
—If the batch is accepted and the number of nonconforming items in the sample is 0, the qualification score is increased by 5; .—If the batch is accepted and the number of nonconforming items in the sample is If the number is 1, the qualification score is increased by 1; in any other case, the qualification score is reset to 0. d) Sampling plan of Ac-o
If the batch is accepted, the qualification score is increased by 3:
In any other case, the qualification score is reset to 0. 5.3.3 Normal inspection = sampling plan
Let the rules for calculating the qualification score of the two-European sampling plan for normal inspection be as follows a) Sampling plan of Acr1
If for the first sample, the batch is accepted when the AQL is tightened by one level, the qualification score is increased by 5; - If for the first sample, the batch is accepted, but the AQL is tightened by one level, it is not accepted, the qualification score is increased by 3 - In any other case, the qualification score is reset to 0. b) Acl -0,Ac 1, or 3 [Ac1 -1 or 2] sampling plan means that there are no defective crystals in the sample: the batch is accepted and the qualification score is 5-If the sum of defective products in the two samples is 1, the batch is accepted and the qualification score is increased by 1:-In any other case, the qualification score is reset to 5. 5.3.4 Normal inspection multiple sampling plan
The rule for calculating the qualification score of the normal inspection multiple sampling plan is as follows: If the batch is accepted for the ...-th sample, the qualification score is increased by 5;-If the batch is accepted after sampling the first or third sample, the qualification score is increased by 3;-In any other case, the qualification score is reset to 0. Only Ac≥0 is allowed Multiple sampling plans. 5.3.5 Relaxed inspection sampling plan
5.3.5.1 For all single, double and multiple sampling plans for relaxed inspection, the above rules for normal inspection apply, except that the increase in qualification score is different as follows:
-Change 5 points in normal inspection situation to 3 points in relaxed inspection;-Change 3 points in normal inspection situation to 1 point in relaxed inspection, 5.3.5.2 For example, for a single sampling plan with relaxed inspection Ac=3, the rules for calculating qualification score are as follows:---If the batch is accepted when AQL is tightened by two levels, the qualification score is increased by 3; if the batch is accepted when A is tightened by one level, but not accepted when AQL is tightened by two levels, the qualification score is increased by 1-: In any other case, the qualification score is reset to 0. Note: In the case of relaxed inspection, at least 17 batches are required to obtain batch qualification. For the single sampling plan of the policy wide inspection with Ac=0, the qualification score of each batch of inspection will only increase by 1 point, and it will not reach 50 points within 20 batches (see 5.2.2.1h)),5
GB/T 2828.3—2008/1SO 2859-3:20055.3.6 Resetting of qualification score
When any of the following situations occurs, the qualification score shall be reset to 0: any transfer except normal inspection to relaxed inspection; any change of status (qualification, requalification or cancellation); any change of skip inspection frequency.
5.4 Example of product qualification
The following is a numerical example of product qualification. Example 1: In the product qualification stage, the normal inspection or the effective wide inspection of G13/T2828.1, or a combination of the two (see 5.2.1d)) is adopted. Assume that the capacitors produced by a qualified manufacturer meet all the requirements of 5.21a). In addition, the basic continuous production requirements are met (see 5.2+1e)): the AQL for non-conforming products is set to 0.65 (%): the agreed stable production cycle is 4 months (see 5.2.1f); the first 14 batches submitted for the first time in the past 7 months are all accepted according to normal inspection; the inspection results of the 11 batches are shown in Table 1.
Results of Example 1
Note: In the batch inspection stage, only the normal inspection in GB/T2828.1 is used in this example. Acceptability
Qualification score
(Assume)
The qualification score is more than 50 in less than 20. The product meets the requirements of 5.2.2, and the 7-month production cycle exceeds the required 4-month stable cycle. The general requirements of 5.2.1f) are also met. Therefore, after the approval of the responsible department, the product passes the qualification of the batch inspection. 6 Skip-batch sampling procedure
6. 1 General
6.1.1 Qualification stage
When the supplier and the product are qualified for skip-batch inspection, the qualification stage ends and the qualified skip-batch stage begins. 6.4 gives the sampling plan and batch selection and inspection procedures that can be used in this stage. 6
6.1.2 Overview of skip-batch sampling procedure
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GB/T 2828.3—2008/IS0 2859-3:The basic structure of the skip lot sampling procedure of this part of 2005GB/T2828 is shown in Figure 1: There are three basic program states in two stages:
State 1: remote batch inspection state (qualification stage); a)
b) State 2: skip lot inspection state (qualified skip lot stage); c) State 3: skip lot interruption state (also qualified skip lot stage), in which the product is temporarily returned to batch inspection. The skip lot sampling procedure of the product starts at state 1 (qualification stage), in which batch inspection is adopted. When the supplier and the product are qualified for skip lot inspection according to 5.1 and 5.2, the procedure switches to state 2 (skip lot inspection state). Start
State 1
《Batch inspection》
Not yet qualified
Whether all the requirements in
5. 155.2 are met!
State 2
(Skip-batch inspection)
Is the skip-batch qualification maintained?
Is the qualification score
re-set
State 3
(Skip-batch interruption)
Is the qualification re-qualified?
Basic structure of the skip-batch sampling procedure
GB/T 2828.3—2008/ISO 2859-3:2005The first step in state 2 is to determine the initial skip-batch inspection frequency (see 6.2 and Figure 2). In state 2, the skip-batch inspection frequency can be changed from one frequency to another (see 6.3 and Figure 3).
In state 2, the skip-batch sampling may be temporarily interrupted (see 6.5) and the result is transferred to state 3 (skip-batch interruption state). In state 3, the product will be requalified under less stringent conditions (see 6.6). If it passes, it will return to state 2 (skip batch inspection state). In state 2 or state 3 (qualified for skip batch stage), the product may be disqualified for skip batch (see 6.7), thus returning to state 1 (batch inspection state). In this case, the product must be requalified in order to return to skip batch inspection. 6.2 Initial skip inspection frequency and its determination
6.2.1 Initial skip inspection frequency
In state 2 (skip batch inspection state), the permitted initial skip inspection frequency is: a) 1/2, that is, inspect one batch in every 2 submitted batches; b) 1/3, that is, inspect one batch in every 3 submitted batches; c) 1/1. That is, inspect one batch in every 4 submitted batches. 6.2.2 Determination of initial inspection rate
Figure 2 summarizes the rules for determining the initial skip inspection frequency. When determining the initial skip inspection frequency, the number of batches required for qualification is used, which is 10 to 20. bzxz.net
If 10 to 11 batches are required for qualification, the initial skip inspection frequency should be 1/4; if 12 to 14 batches are required for qualification, the initial skip inspection frequency should be 1/3; if 15 to 20 batches are required for qualification, the initial skip inspection frequency should be 1/2. 6.2.3 Example of determining the initial skip inspection frequency
The following example is a continuation of Example 1 in 5. 4.
Example 2 The number of batches required to obtain skip inspection qualification is 14. Therefore, the initial skip inspection frequency is 1/3. If effective measures are taken to change the level of selection after the third batch, the number of qualified batches after the qualification score is reset can be considered to be 11. At this time, the responsible department can stipulate that the initial skip inspection frequency is 1/4.6.3 Skip inspection frequency and change
6.3.1 Skip inspection frequency
In state 2 (skip batch inspection state), the permitted skip inspection frequency is: a) 1/2, that is, one batch is inspected in every 2 submitted batches! b) [/3, that is, one batch is inspected in every 3 submitted batches; c) 1/4. That is, one batch is inspected in every 4 submitted batches; d) 1/5, that is, one batch is inspected in every 5 submitted batches. 6.3.2 Reduction of Skip Inspection Rate
In state 2 (skip inspection state), if all of the following conditions are met, the skip inspection frequency shall be changed to the next lower frequency (e.g. from 1/3 to 1/4) unless the current frequency used is 1/5a) 10 or more consecutive batches have been received in state 2 (skip inspection state) since the most recent qualification, frequency change or requalification,
b) the qualification score for 20 consecutive batches reaches or exceeds 50; c) the responsible department agrees to the change.
In state 2, for each inspection lot, the qualification score shall be updated: either increased or reset. If different AQI values ​​are specified for two or more non-conforming categories or non-conforming classes, the above conditions must be met for each category. Figure 3 is a flow chart of the skip inspection frequency change, interruption and disqualification procedure. 8
15 to 20 batches
Condition 2
(dirty)
Peak rate is 1/2
Condition 1
(batch-by-batch inspection)
Within 20 batches
Does the qualification score reach
or exceed 50 points?
Does it meet all the requirements in
5.2?
How many batches are needed
to reach or exceed the qualification score
12 to 14 batches
(skip batch)
frequency 1/3
-iiKANiiKAca
GB/T 2828.3—2008/IS0 2859-3:2005 Xiang
10 to 11 batches
status 2
(batch)
frequency is 1/4
2Determination of initial skip inspection frequency2 Reduction of skip inspection rate
In state 2 (skip inspection state), if all of the following conditions are met, the skip inspection frequency shall be changed to the next lower frequency (e.g. from 1/3 to 1/4) unless the current frequency used is 1/5a) 10 or more batches have been received in state 2 (skip inspection state) since the most recent qualification, frequency change or requalification,
b) the qualification score for 20 consecutive batches reaches or exceeds 50; c) the responsible department agrees to the change.
In state 2, for each inspection batch, the qualification score shall be updated: or increased or reset. If different AQI values ​​are specified for two or more non-conforming categories or non-conforming categories, the above conditions must be met for each category. Figure 3 is a flow chart of the skip inspection frequency change, interruption and disqualification procedure. 8
15 to 20 batches
Condition 2
(dirty)
Peak rate is 1/2
Condition 1
(batch-by-batch inspection)
Within 20 batches
Does the qualification score reach
or exceed 50 points?
Does it meet all the requirements in
5.2?
How many batches are needed
to reach or exceed the qualification score
12 to 14 batches
(skip batch)
frequency 1/3
-iiKANiiKAca
GB/T 2828.3—2008/IS0 2859-3:2005 Xiang
10 to 11 batches
status 2
(batch)
frequency is 1/4
2Determination of initial skip inspection frequency2 Reduction of skip inspection rate
In state 2 (skip inspection state), if all of the following conditions are met, the skip inspection frequency shall be changed to the next lower frequency (e.g. from 1/3 to 1/4) unless the current frequency used is 1/5a) 10 or more batches have been received in state 2 (skip inspection state) since the most recent qualification, frequency change or requalification,
b) the qualification score for 20 consecutive batches reaches or exceeds 50; c) the responsible department agrees to the change.
In state 2, for each inspection batch, the qualification score shall be updated: or increased or reset. If different AQI values ​​are specified for two or more non-conforming categories or non-conforming categories, the above conditions must be met for each category. Figure 3 is a flow chart of the skip inspection frequency change, interruption and disqualification procedure. 8
15 to 20 batches
Condition 2
(dirty)
Peak rate is 1/2
Condition 1
(batch-by-batch inspection)
Within 20 batches
Does the qualification score reach
or exceed 50 points?
Does it meet all the requirements in
5.2?
How many batches are needed
to reach or exceed the qualification score
12 to 14 batches
(skip batch)
frequency 1/3
-iiKANiiKAca
GB/T 2828.3—2008/IS0 2859-3:2005 Xiang
10 to 11 batches
status 2
(batch)
frequency is 1/4
2Determination of initial skip inspection frequency
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