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1、OCTOBER 2018AMERICAN NATIONAL STANDARDASQ/ANSI Z1.42003 (R2018)SAMPLING PROCEDURES AND TABLES FOR INSPECTION BY ATTRIBUTESThis standard is a reaffirmation of ANSI/ASQ Z1.42003 (R2013)Copyright American Society for Quality-,-,-Provided by IHS Markit under license with ASQLicensee=Maquet Cardiovascula
2、r LLC/5971524001, User=Eggenberger, KarenNo reproduction or networking permitted without license from IHSNot for Resale, 07/15/2019 07:51:21 MDTASQ/ANSI Z1.4-2003 (R2018)AMERICAN NATIONAL STANDARDSampling Procedures and Tables for Inspection by AttributesPrepared byASQ (ASC Z1) Subcommittee on the A
3、pplication of Statistical MethodsANSI-Accredited Standards Developer (ASD) American Society for Quality-,-,-ABSTRACTSampling Procedures and Tables for Inspection by Attributes is an acceptance sampling system to be used with switching rules on a continuing stream of lots for AQL specified. It provid
4、es tightened, normal, and reduced plans to be applied for attributes inspection for percent nonconforming or nonconformities per 100 units.AMERICAN NATIONAL STANDARD: An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American Nationa
5、l Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processe
6、s, or proce- dures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest edition.CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standard
7、s Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.Su
8、ggestions for improvement of this standard are welcomed. Send your comments to the sponsor, ASQ Standards, 600 North Plankinton Avenue, Milwaukee, WI 53203 or standardsasq.org.Copyright American Society for Quality Provided by IHS Markit under license with ASQNo reproduction or networking permitted
9、without license from IHSLicensee=Maquet Cardiovascular LLC/5971524001, User=Eggenberger, Karen Not for Resale, 07/15/2019 07:51:21 MDT-,-,-2018 by ASQCopyright protection notice for the ASQ/ANSI Z1.4-2003 (R2018) Standard.This Standard is subject to copyright claims of ASQ. Not for resale. No part o
10、f this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ASQ.All requests pertaining to the ASQ/ANSI Z1.4-2003 (R2018) Standard should be submitted to ASQ.ASQ will consider requests for change and information on the submittal
11、 of such requests regarding this Standard. All requests should be in writing to the attention of the Standards Administrator at the address below.ASQ Mission: The American Society for Quality advances individual and organizational performance excellence worldwide by providing opportunities for learn
12、ing, quality improvement, and knowledge exchange.Published by:Table of ContentsParagraphPage1. SCOPE12. DEFINITIONS AND TERMINOLOGY13. PERCENT NONCONFORMING AND NONCONFORMITIES PERHUNDRED UNITS24. ACCEPTANCE QUALITY LIMIT (AQL)25. SUBMISSION OF PRODUCT36. ACCEPTANCE AND NON-ACCEPTANCE37. DRAWING OF
13、SAMPLES48. NORMAL, TIGHTENED, AND REDUCED INSPECTION49. SAMPLING PLANS510. DETERMINATION OF ACCEPTABILITY611. SUPPLEMENTARY INFORMATION6TablesTable ISample Size Code Letters10Table II-ASingle Sampling Plans for Normal Inspection (Master Table)11Table II-BSingle Sampling Plans for Tightened Inspectio
14、n (Master Table)12Table II-CSingle Sampling Plans for Reduced Inspection (Master Table)13Table III-ADoubling Sampling Plans for Normal Inspection (Master Table)14Table III-BDoubling Sampling Plans for Tightened Inspection (Master Table)15Table III-CDoubling Sampling Plans for Reduced Inspection (Mas
15、ter Table)16Table IV-AMultiple Sampling Plans for Normal Inspection (Master Table)17Table IV-BMultiple Sampling Plans for Tightened Inspection (Master Table)19Table IV-CMultiple Sampling Plans for Reduced Inspection (Master Table)21Table V-AFactors for Determining Approximate Values for Average Outg
16、oing Quality Limits for Normal Inspection (Single Sampling)23Table V-BFactors for Determining Approximate Values for Average Outgoing Quality Limits for Tightened Inspection (Single Sampling)24Table VI-ALimiting Quality (in percent nonconforming) for Which Pa = 10 Percent(for Normal Inspection, Sing
17、le Sampling)25Table VI-BLimiting Quality (in nonconformities per hundred units) for Which Pa = 10 Percent(for Normal Inspection, Single Sampling)26Table VII-ALimiting Quality (in percent nonconforming) for Which Pa = 5 Percent(for Normal Inspection, Single Sampling)27Table VII-BLimiting Quality (in
18、nonconformities per hundred units) for Which Pa = 5 Percent(for Normal Inspection, Single Sampling)28Table VIIILimit Numbers for Reduced Inspection29Table IXAverage Sample Size Curves for Double and Multiple Sampling Plans(normal and tightened inspection)30Table X-ASample Size Code Letter AIndividua
19、l Plans31Table X-BSample Size Code Letter BIndividual Plans33Table X-CSample Size Code Letter CIndividual Plans35iii-,-,-Table X- DSample Size Code Letter DIndividual Plans37Table X-ESample Size Code Letter EIndividual Plans39Table X-FSample Size Code Letter FIndividual Plans41Table X- GSample Size
20、Code Letter GIndividual Plans43Table X-HSample Size Code Letter HIndividual Plans45Table X-JSample Size Code Letter JIndividual Plans47Table X-KSample Size Code Letter KIndividual Plans49Table X-LSample Size Code Letter LIndividual Plans51Table X-MSample Size Code Letter MIndividual Plans53Table X-
21、NSample Size Code Letter NIndividual Plans55Table X-PSample Size Code Letter PIndividual Plans57Table X-QSample Size Code Letter QIndividual Plans59Table X-RSample Size Code Letter RIndividual Plans61Table X-SSample Size Code Letter SIndividual Plans63Table XIAverage Outgoing Quality Limit Factors f
22、or ASQ/ANSI-Z1.4 Scheme Performance(Single Sampling)64Table XIILimiting Quality for ASQ/ANSI-Z1.4 Scheme Performance for WhichPa = 10 Percent (Single Sampling)65Table XIIILimiting Quality for ASQ/ANSI-Z1.4 Scheme Performance for WhichPa = 5 Percent (Single Sampling)66Table XIVAverage Sample Size Tab
23、les for ASQ/ANSI-Z1.4 Scheme Performance (Single Sampling)67Table XV-ASample Size Code Letter AScheme Performance71Table XV-BSample Size Code Letter BScheme Performance72Table XV-CSample Size Code Letter CScheme Performance73Table XV- DSample Size Code Letter DScheme Performance74Table XV-ESample Si
24、ze Code Letter EScheme Performance75Table XV-FSample Size Code Letter FScheme Performance76Table XV- GSample Size Code Letter GScheme Performance77Table XV-HSample Size Code Letter HScheme Performance78Table XV-JSample Size Code Letter JScheme Performance79Table XV-KSample Size Code Letter KScheme P
25、erformance80Table XV-LSample Size Code Letter LScheme Performance81Table XV-MSample Size Code Letter MScheme Performance82Table XV- NSample Size Code Letter NScheme Performance83Table XV-PSample Size Code Letter PScheme Performance84Table XV-QSample Size Code Letter QScheme Performance85-,-,-Table X
26、V-RSample Size Code Letter RScheme Performance86INDEX OF TERMS WITH SPECIAL MEANINGS87ivSAMPLING PROCEDURES AND TABLES FOR INSPECTION BY ATTRIBUTES1Copyright American Society for Quality Provided by IHS Markit under license with ASQNo reproduction or networking permitted without license from IHSLice
27、nsee=Maquet Cardiovascular LLC/5971524001, User=Eggenberger, Karen Not for Resale, 07/15/2019 07:51:21 MDT1. SCOPE1.1 PURPOSE. This publication establishes sampling plans and procedures for inspection by attributes. When specified by the responsible authority, this publication shall be referenced in
28、 the specification, contract, inspection instructions, or other documents and the provisions set forth herein shall govern. The “responsible authority” shall be designated in one of the above documents, as agreed to by the purchaser and seller or producer and user.1.2 APPLICATION. Sampling plans des
29、ignated in this publication are applicable, but not limited, to inspection of the following:a. End items.b. Components and raw materials.c. Operations.d. Materials in process.e. Supplies in storage.f. Maintenance operations.g. Data or records.h. Administrative procedures.These plans are intended pri
30、marily to be used for a continu- ing series of lots or batches. The plans may also be used for the inspection of isolated lots or batches, but, in this latter case, the user is cautioned to consult the operating charac- teristic curves to find a plan which will yield the desired pro- tection (see 11
31、.6).1.3 INSPECTION. Inspection is the process of measur- ing, examining, testing, or otherwise comparing the unit of product (see 1.5) with the requirements.1.4 INSPECTION BY ATTRIBUTES. Inspection byattributes is inspection whereby either the unit of product is classified simply as conforming or no
32、nconforming, orthe number of nonconformities in the unit of products is counted, with respect to a given requirement or set of requirements.1.5 UNIT OF PRODUCT. The unit of product is the unit inspected in order to determine its classification as con- forming or nonconforming or to count the number
33、of non- conformities. It may be a single article, a pair, a set, a length, an area, an operation, a volume, a component of an end product, or the end product itself. The unit of product may or may not be the same as the unit of purchase, supply, pro- duction, or shipment.2. DEFINITIONS AND TERMINOLO
34、GYThe definitions and terminology employed in this standard are in accord with ISO 3534-2 (Terms, Symbols, and Definitions for Acceptance Sampling). The following two definitions are particularly important in applying the standard.DEFECT: A departure of a quality characteristic from its intended lev
35、el or state that occurs with a sever- ity sufficient to cause an associated product or service not to satisfy intended normal, or foresee- able, usage requirements.NONCONFORMITY: A departure of a quality charac- teristic from its intended level or state that occurs with severity sufficient to cause
36、an associated prod- uct or service not to meet a specification require- ment.These acceptance sampling plans for attributes are given in terms of the percent or proportion of product in a lot or batch that depart from some requirement. The general ter- minology used within the document will be given
37、 in terms of percent of nonconforming units or number of nonconfor- mities, since these terms are likely to constitute the most widely used criteria for acceptance sampling.In the use of this standard it is helpful to distinguish between:a. an individual sampling plana specific plan that states the
38、sample size or sizes to be used, and the associated acceptance criteria.ASQ/ANSI Z1.4-2003 (R2018)b. a sampling schemea combination of sampling plans with switching rules and possibly a provision for discontinuance of inspection. In this standard the terms “sampling scheme” and “scheme per- formance
39、” will be used in the restricted sense described in Sec. 11.1.c. a sampling systema collection of sampling schemes. This standard is a sampling system indexed by lot-size ranges, inspection levels, and AQLs.3. PERCENT NONCONFORMING AND NONCONFORMITIES PER HUNDRED UNITS3.1 EXPRESSION OF NONCONFORMANC
40、E. Theextent of nonconformance of product shall be expressed either in terms of percent nonconforming or in terms of non- conformities per hundred units.3.2 PERCENT NONCONFORMING. The percent non- conforming of any given quantity of units of product is one hundred times the number of nonconforming u
41、nits divided by the total number of units of product, i.e.:Percent nonconforming = Number nonconforming 100Number of units inspected3.3 NONCONFORMITIES PER HUNDRED UNITS.The number of nonconformities per hundred units of any given quantity of units of product is one hundred times the number of nonco
42、nformities contained therein (one or more nonconformities being possible in any unit of product) divided by the total number of units of product, i.e.:Nonconformities per = Number of nonconformities100 hundred unitsNumber of units inspectedIt is assumed that nonconformities occur randomly and with s
43、tatistical independence within and between units.4. ACCEPTANCE QUALITY LIMIT (AQL)4.1 USE. The AQL together with the Sample Size Code Letter, is used for indexing the sampling plans provided herein.4.2 DEFINITION. The AQL is the quality level that is the worst tolerable process average when a contin
44、uing series of lots is submitted for acceptance sampling.Note: The use of the abbreviation AQL to mean Acceptable Quality Level is no longer recommended.4.3 NOTE ON THE MEANING OF AQL. The conceptof AQL only applies when an acceptance sampling scheme with rules for switching between normal, tightene
45、d and reduced inspection and discontinuance of sampling inspec- tion is used. These rules are designed to encourage suppliers to have process averages consistently better than the AQL. If suppliers fail to do so, there is a high probability of being switched from normal inspection to tightened inspe
46、ction where lot acceptance becomes more difficult. Once on tight- ened inspection, unless corrective action is taken to improve product quality, it is very likely that the rule requiring dis- continuance of sampling inspection will be invoked.Although individual lots with quality as bad as the AQL can be accepted with fairly high probability, the designation of an AQL does not suggest that this is necessarily a desirable quality level. The AQL is a parameter of the sampling scheme and should not be confused w