GB/T 6378.7-2024 English PDFUS$599.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 6378.7-2024: Sampling procedures for inspection by variables - Part 7: Procedures for assessment of declared quality levels for percent nonconforming Status: Valid
Basic dataStandard ID: GB/T 6378.7-2024 (GB/T6378.7-2024)Description (Translated English): Sampling procedures for inspection by variables - Part 7: Procedures for assessment of declared quality levels for percent nonconforming Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A41 Classification of International Standard: 03.120.30 Word Count Estimation: 30,369 Date of Issue: 2024-09-29 Date of Implementation: 2025-04-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 6378.7-2024: Sampling procedures for inspection by variables - Part 7: Procedures for assessment of declared quality levels for percent nonconforming---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. ICS 03.120.30 CCSA41 National Standard of the People's Republic of China Sampling procedures for measurement inspection Part 7.Sampling procedures for nonconforming Procedure for assessing the claimed quality level of product quality Released on 2024-09-29 2025-04-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and abbreviations 2 3.1 Terms and Definitions 2 3.2 Symbols and abbreviations 2 4 Principle 3 5 Declared Quality Level (DQL) 4 6 Sampling plan 4 6.1 LQR (Limiting Mass Ratio) Level 4 6.2 Selection of “s” method sampling plan 7 6.3 Selection of “σ” method sampling plan 7 7 Implementation of the sampling plan 8 7.1 Sample Selection 8 7.2 “S” method judgment rules 8 7.3 “σ” method judgment rules 11 7.4 Disposal of defective products 13 8 Additional Information 13 8.1 Approximate probability curve for overall nonconformity in verification 13 8.2 Table 14 showing discrimination ability Appendix A (Informative) Methods for matching a sampling plan for measurement with a sampling plan for attributes 18 Appendix B (Informative) Examples of the use of sampling inspection procedures 19 Reference 22ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is part 7 of GB/T 6378 "Measurement sampling inspection procedures". GB/T 6378 has been published in the following parts. --- Part 1.Single sampling for batch inspection of a single quality characteristic and a single AQL indexed by acceptance quality limit (AQL) plan; --- Part 3.Secondary sampling plan for batch inspection based on acceptance quality limit (AQL); --- Part 4.Procedure for assessing the claimed quality level of the mean; --- Part 7.Procedure for assessing the claimed quality level for the nonconforming rate. This document is modified to adopt ISO 3951-4.2011 "Sampling procedures for measurement of quantities — Part 4.Procedures for assessment of claimed quality level". The technical differences between this document and ISO 3951-4.2011 and their reasons are as follows. --- Added the term 3.1.3 “claimed quality level” because it is a very important term in this document (see 3.1.3). The following editorial changes were made to this document. --- In order to coordinate with the existing standards, the name of the standard is changed to "Metric Sampling Inspection Procedures Part 7.Claimed Quality of Nonconforming Product Rates" "Quality Level Assessment Procedure"; --- Changed the first sentence of the first paragraph of the introduction, changing "The scope of this document differs from parts 1, 2 and 3 of the ISO 3951 series" to "This document The scope of the parts is different from GB/T 6378.1-2008, ISO 3951-2.2013, GB/T 6378.3-2024, because 6378 is Part 2 of the column has not yet been released; --- Added the last description of GB/T 6378.4-2018 in the fourth paragraph of the introduction, "GB/T 6378.4-2018 can be used in the evaluation The claimed quality of a certain verification population is verified during the review and audit, but the mean value of the quality characteristic is used as the quality indicator for retrieval"; --- Added the explanation of the situation of passing the inspection at the end of the introduction. "The situation of passing the inspection does not mean that the overall inspection qualified"; --- Added the source of the terms mass ratio and limit mass ratio (see 3.1.1 and 3.1.2), because these two terms are in GB/T 2828.4- Defined in.2008; ---Changed the formula in 3.2.1 symbol B(ν,ν), changing the formula "B(ν,ν)=Γ(ν)Γ(ν)/Γ(ν)" to "B(ν, ν)=Γ(ν) Γ(ν)/Γ(2ν)”, the original formula is wrong; --- Deleted "When the process standard deviation is known, see B.2 for an example of a one-sided specification limit." in 7.2.2 and moved it to the last line of 7.3.2 paragraph, the original text is placed in the wrong place; ---Changed "^py=0.0218" in 7.2.6.The original "^py=0.0477" is wrong; ---Deleted the third line "=Φ 3.1000-3.1169" in 7.3.5 0.00310 × 33”, the original text was edited incorrectly, with one extra line written; --- Changed the symbols in Appendix B.2, changing "nΦ, kΦ" to "nσ, kσ", the original text was edited incorrectly. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed and coordinated by the National Technical Committee for Standardization of Statistical Methods Application (SAC/TC21). This document was drafted by. Shanxi Chengong New Energy Technology Co., Ltd., China National Institute of Standardization, Shanxi Fuhengdi New Materials Co., Ltd. Company, Anhui Agricultural University, Xiamen Lidebao Electronic Technology Co., Ltd., Liaoning Provincial Market Supervision Administration, Qingyang Quality Inspection and Testing Research Institute Perfect (Guangdong) Daily Necessities Co., Ltd., Hainan Electric Power Industry Development Co., Ltd., China Southern Power Grid Research Institute Co., Ltd. company. The main drafters of this document are. Zhao Jing, Liu Gang, Zhang Xuan, Xiao Yingying, Sun Junbiao, Chai Juncai, Cheng Jing, Sun Ningzhi, Zhang Fan, Yu Zhenfan, Li Ye, Li Junping, Jiang Donghong, Zhang Jiaoxia, Lü Qingshan, Song Yufei, Wang Hong, Wang Yue, and Sun Xiaopu.IntroductionThe scope of this document is different from GB/T 6378.1-2008, ISO 3951-2.2013, GB/T 6378.3-2024, ISO 3951-5. 2006.The system of acceptance sampling procedures specified in the aforementioned standards is applicable to the Bilateral agreement. Acceptance sampling procedures are used only as a rule to decide whether to accept a lot after inspecting a sample of the lot. Therefore, these procedures are not Clearly address any formal claims of quality levels. In acceptance sampling, it is considered that there is no clear boundary between the quality levels of acceptable batches and unacceptable batches. 2008, ISO 3951-2.2013, GB/T 6378.3-2024, ISO 3951-5.2006, a certain acceptance quality limit agreed by both parties The AQL is the worst process average quality level that can be tolerated when submitting a series of consecutive batches. The plan is designed to encourage manufacturers to produce products with a process average quality that is better than the selected AQL. Small enough that the protection provided by a sampling plan targeting individual lots is likely to be greater than that provided by a sampling plan targeting individual lots. It should be smaller (under the same conditions, the risk of missing a sample will be greater with a sampling plan with a lower sample size). GB/T 6378 "Measurement Sampling Inspection Procedure" series of standards are basic general standards for measurement sampling inspection, which are divided into the following Seven parts. --- Part 1.Single sampling for batch inspection of a single quality characteristic and a single AQL indexed by acceptance quality limit (AQL) Scheme (GB/T 6378.1-2008). It is intended to specify the acceptance sampling system for the measurement single sampling inspection plan, which is based on the acceptance of quality The purpose of the method given in this part of ISO 14001 is to ensure that the actual quality level is better than the acceptance quality limit. The batch is accepted with a high probability, while ensuring that the batches with actual quality levels worse than the acceptance quality limit are accepted with a low probability. --- Part 2.General rules for a single sampling plan for batch inspection of independent quality characteristics indexed by acceptance quality limit (AQL) It is intended to give a more general technical treatment of lot-by-lot variable sampling for independent quality characteristics. --- Part 3.Secondary sampling plan for batch inspection based on acceptance quality limit (AQL) (GB/T 6378.3-2024). In the acceptance sampling system that specifies the measurement secondary sampling inspection plan, the secondary sampling inspection plan in this part is Supplement to GB/T 6378.1. --- Part 4.Procedure for assessing the claimed quality level of the mean (GB/T 6378.4-2018). Aims to specify the procedure for assessing the claimed quality level of the mean. The average value of a certain quality characteristic of a body is a quantitative sampling inspection procedure for quality indicators, which is applicable to various forms of quality verification. This part is the GB/T 6378 series of documents for the assessment procedures of claimed quality levels. --- Part 5.Sequential sampling plan for metrological inspection based on acceptance quality limit (AQL). Sequential sampling inspection in this part The plan is a supplement to GB/T 6378.1. --- Part 6.Sampling plan for isolated batch inspection based on limit quality LQ. This sampling system is used for isolated batches (isolated series Batch, isolated batch or single batch) inspection, the transfer rules of GB/T 6378.1 do not apply here. The sampling plan provided in this part As a supplement to GB/T 6378.1 and compatible with GB/T 6378.1. A supplement to GB/T 6378.4, which together with GB/T 6378.4 constitutes the GB/T 6378 series of documents for claiming quality levels. Assessment procedures. The procedures in GB/T 6378.1-2008, ISO 3951-2.2013, GB/T 6378.3-2024, ISO 3951-5.2006 are applicable to the verification Acceptance sampling is not suitable for verifying the claimed quality of a verification population during reviews and audits. The main reason for this is that these standards are based on acceptance sampling. The quality limit is used for retrieval, which is only related to the actual purpose of acceptance sampling, so the two types of risks are balanced. GB/T 6378.4-2018 is available It is used to verify the claimed quality of a certain verification population during review and audit, but the mean value of the quality characteristic is used as the quality indicator for retrieval. The sampling inspection procedures specified in this document are designed to meet the increasing need for sampling inspections during formal system reviews. When implementing this form of inspection, the responsible authority needs to consider the risk of making erroneous conclusions and should be aware of the risks of making erroneous conclusions when planning and conducting the review (or audit, or Such risks should be considered in the experiment. This document provides guidance and rules to help users consider risks in an informed manner. This document designs some rules so that when the actual quality level of the verification population is not inferior to the claimed quality level, the verification population is judged to be The risk of misjudging a person as unqualified is small. If you also want to make sure that the risk of passing the inspection is also small when the actual quality level of the inspection is worse than the claimed quality level, then To minimize the sample size, it is allowed to pass the inspection when the actual quality level is actually worse than the claimed quality level. Slightly higher. The wording of the findings reflects the imbalance in the risks of reaching different erroneous conclusions. When the sampling results determine that the inspection population is unqualified, there is a high degree of confidence that the actual quality level of the inspection population is inferior to the claimed quality. level. When the inspection is judged to be passed based on the sampling results, it is considered that. for this limited sample size, the actual quality level of the inspection population is not found to be inferior to the declared The situation of passing the inspection does not mean that the inspection is generally qualified. Sampling procedures for measurement inspection Part 7.Sampling procedures for nonconforming Procedure for assessing the claimed quality level of product quality1 ScopeThe quantitative sampling plan and assessment procedures specified in this document are used to assess whether the quality level of a population (batch or process, etc.) meets the requirements. These sampling plans were designed to make their operating characteristic curves as close as possible to those in GB/T 2828.4 The operating characteristic curve of the corresponding attribute sampling plan in the verification is matched to the actual quality level of the verification population, so as to The choice between using sampling by attributes and sampling by variables is not affected by the probability of acceptance. The risk of being judged as unqualified is 1.4%~8.2%; when the actual quality level is LQR (limiting quality ratio) times the claimed quality level (see Chapter 4) is considered to have a 10% risk of passing the audit. This document provides three options for the cases where the process standard deviation is known and unknown. Sampling schemes for different levels of discrimination. Unlike the procedures in other parts of GB/T 6378, the procedures in this document are not applicable to acceptance sampling of lots. The balance between the risk of drawing incorrect conclusions is different for primary sampling and check sampling. This document is applicable to various forms of quality inspection, that is, using the inspection results of samples to indicate whether a certain inspection population does not meet certain requirements. This document is applicable to situations where it is permitted to draw a number of units of product from the verification population to form a random sample. The sampling plan provided in this document can be used for (but not limited to) testing the following products, such as. ---Final product; ---Parts and raw materials; ---operate; --- Work in progress; ---Inventory; ---Maintenance operations; ---Data or records; ---Management procedures. The procedures in this document apply to situations where quality characteristics are normally distributed, independent, measurable variables and are primarily concerned with The quality indicator is the defective rate.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 2828.4 Sampling inspection procedures by attributes Part 4.Procedure for assessment of claimed quality level (GB/T 2828.4-2008, ISO 2859-4.2002, MOD) GB/T 3358.1 Statistical vocabulary and symbols Part 1.General statistical terms and terms used in probability (GB/T 3358.1- 2009,ISO 3534-1.2006,IDT) GB/T 3358.2 Statistical Vocabulary and Symbols Part 2.Applied Statistics (GB/T 3358.2-2009, ISO 3534-2. 2006, IDT) GB/T 6378.1 Sampling inspection procedures for measurement - Part 1.Sampling inspection procedures for single quality characteristics and single ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 6378.7-2024_English be delivered?Answer: Upon your order, we will start to translate GB/T 6378.7-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. 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