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1、BRITISH STANDARD BS EN 61193-2:2007 Quality assessment systems Part 2: Selection and use of sampling plans for inspection of electronic components and packages The European Standard EN 61193-2:2007 has the status of a British Standard ICS 31.190 ? Licensed Copy: London South Bank University, London
2、South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI BS EN 61193-2:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007 ISBN 978 0 580 55333 2 National foreword This British Standard
3、is the UK implementation of EN 61193-2:2007. It is identical to IEC 61193-2:2007. The UK participation in its preparation was entrusted to Technical Committee EPL/501, Electronic assembly technology. A list of organizations represented on this committee can be obtained on request to its secretary. T
4、his publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London
5、 South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61193-2 NORME EUROPENNE EUROPISCHE NORM November 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechni
6、que Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61193-2:2007 E ICS 31.190 English version Quality assessment syst
7、ems - Part 2: Selection and use of sampling plans for inspection of electronic components and packages (IEC 61193-2:2007) Systme dassurance de la qualit - Partie 2: Choix et utilisation des plans dchantillonnages pour le contrle des composants lectroniques et des botiers (CEI 61193-2:2007) Qualittsb
8、ewertungssysteme - Teil 2: Auswahl und Anwendung von Stichprobenanweisungen fr die Prfung elektrischer Bauelemente und Gehuse (IEC 61193-2:2007) This European Standard was approved by CENELEC on 2007-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
9、 the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard ex
10、ists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national ele
11、ctrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switz
12、erland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI Foreword The text of document 91/690/FDIS, future edition 1 of IEC 61193-2, prepared by IEC TC 91, Electronics assembly technology,
13、 was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61193-2 on 2007-11-01 The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-08-01 latest date
14、by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61193-2:2007 was approved by CENELEC as a European Standard without any modification. _ EN 61193-2:2007 2
15、Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references .5 3 Terms and definitions .5 4 Sampling system 6 4.1 Formation and identification of lots6 4.2 Drawing o
16、f samples.6 4.2.1 Selection of sample items6 4.2.2 Process of sampling 6 4.3 Sampling plans6 4.3.1 Inspection level .6 4.3.2 Sampling plan for normal inspection 7 4.3.3 Acceptance number.7 4.3.4 Tightened or reduced inspection7 5 Acceptance and rejection .8 5.1 Acceptability criteria 8 5.2 Dispositi
17、on of rejected lots 8 6 Statistical verified quality limit (SVQL)8 6.1 General.8 6.2 Calculation of the SVQL9 Annex A (informative) Estimation of the statistical verified quality limit (SVQL) in nonconforming items per million (10-6) at a confidence limit 60 %.10 Annex B (informative) Relationship b
18、etween this standard and ISO 2859-114 Annex C (informative) Example of application of this standard (lot-by-lot inspection of assessment level EZ in IEC/TC 40).16 Bibliography17 Table 1 Sample size 7 Table 2 Sample size code letters .8 Table 3 Coefficients for confidence level 60 % (see also A.5) 9
19、Table A.1 Statistical verified quality limits in nonconforming items per million (10-6) 11 Table A.2 np with confidence limit of 60 % for accumulated number of non- conforming items and coefficient CL.13 Table B.1 Sampling plans corresponding to Table 2-A of ISO 2859-1.14 Table B.2 Tabulated values
20、for operating characteristic curves (p: per cent nonconforming).15 Table C.1 Lot-by-lot inspection of assessment level EZ IEC/TC 40 .16 EN 61193-2:2007 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications 18 Licensed Copy: London So
21、uth Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI INTRODUCTION To obtain a high quality level of products, process controls like 100 % testing of significant characteristics and statistical methods are needed to stabilize, monitor, and
22、improve processes. Sampling inspection is one of the methods to verify whether the process control is effective, and the quality level of a suppliers product by a customer or third party. Today the quality level of products for use in electric and electronic equipment is expected to be equal or clos
23、e to zero defects. But, the assessment of a quality level close to zero defects by sampling only would lead to an unreasonable increase of cost for inspection. A combination of process control and zero acceptance number sampling plans is indispensable. This standard provides a sampling system and pl
24、ans for the inspection of electronic components, packages and modules, manufactured under suitable process control, which prevents the outflow of nonconforming products. NOTE The sampling system provided by this standard is extracted from ISO 2859-1, and is intended to be used for the inspection of
25、final products, either by the manufacturer, a customer, or a third party. EN 61193-2:2007 4 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI QUALITY ASSESSMENT SYSTEMS Part 2: Selection and use of sampling plans
26、 for inspection of electronic components and packages 1 Scope This part of IEC 61193 applies to the inspection of electronic components, packages, and also modules (referred to as “products” in this standard) for use in electronic and electric equipment. It specifies sampling plans for inspection by
27、 attributes on the assumption that the acceptance number is zero (Ac = 0), including criteria for sample selection and procedures. The zero acceptance number sampling plans provided by this standard apply to the inspection of products, that are manufactured under suitable process control with the ta
28、rget of a “zero- defect” quality level before sampling inspection. In addition, this standard provides a method for the calculation of the expected value of the statistical verified quality limit (SVQL) at a confidence level of 60 %. Amongst other things, this method can be used to verify the effect
29、iveness of the suppliers process control. NOTE In this standard the term “module” is used for products which are modules according to the definition in IEC 60194. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o
30、nly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60194: Printed board design, manufacture and assembly Terms and definitions ISO 2859-1:1999, Sampling procedures for inspection by attributes Part 1: Sampling
31、schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 3534-2:2006, Statistics Vocabulary and symbols Part 2: Applied statistics 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60194, ISO 2859-1 and ISO 3534-2, as well as the
32、 following, apply. 3.1 electronic component individual component which includes electronic, optoelectronic and/or micro-electro- mechanical systems (MEMS) element 3.2 electronic package individual electronic element or elements in a container which protects the contents to assure the reliability and
33、 provides terminals to interconnect the container to an outer circuit EN 61193-2:2007 5 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 3.3 electronic module functional block which contains individual electroni
34、c elements and /or electronic packages, to be used in a next level assembly 3.4 inspection level IL level to define sample size for lot size NOTE Sample size of lots depends on the severity of inspection level. 3.5 nonconforming item item with one or more nonconformities NOTE A nonconforming item is
35、 a product which cannot satisfy the requirement (visual examination or electrical performance, etc.) in the lot-by-lot inspection or periodic test, etc. 3.6 structurally similar products products manufactured by the same manufacturer with the same materials, manufacturing processes and methods NOTE
36、Products are structurally similar, even when there are differences e.g. in case size and rated values. Results from designated tests conducted on items of one lot of these products can be accumulated with results of other lots in the same group of structural similarity. 4 Sampling system The procedu
37、re and sampling plans described in this clause are based on an acceptance number zero (Ac = 0). 4.1 Formation and identification of lots The products shall be assembled into identifiable lots or sub-lots. Each lot shall, as far as practicable, consist of items of a single type, grade, class, size an
38、d composition, manufactured under uniform conditions at essentially the same time. 4.2 Drawing of samples 4.2.1 Selection of sample items The items selected for the sample shall be drawn from the lot by simple random sampling (see 3.1.3.4 in ISO 3534-2). However, when the lot consists of sub-lots or
39、 strata, identified by some rational criterion, stratified sampling shall be used in such a way that the size of the subsample from each sublot or stratum is proportional to the size of that sublot or stratum. 4.2.2 Process of sampling Samples may be drawn after the lot has been produced, or during
40、production of the lot. 4.3 Sampling plans 4.3.1 Inspection level The inspection level designates the relative severity of inspection. Three inspection levels, I, II and III, are given for general use. Unless otherwise specified, level II shall be used. Level I may be used when less discrimination is
41、 needed or level III when greater discrimination is required. Four additional special levels, S-1, S-2, S-3 and S-4 may be used where relatively EN 61193-2:2007 6 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI
42、 small sizes are necessary and larger sampling risks can be tolerated, such as destructive inspection or valuable products. The inspection level shall be specified in accordance with the detail specification or an agreement with a supplier and a user. 4.3.2 Sampling plan for normal inspection Unless
43、 otherwise specified in the detail specification, single sampling plans for normal inspection according to Table 1 of this standard shall be applied (see also Annex B). NOTE Table 1 is adapted from ISO 2859-1. Table 1 Sample size Special inspection levels General inspection levels Lot size S-1 S-2 S
44、-3 S-4 2 to 8 2 2 2 2 2 2 3 9 to 15 2 2 2 2 2 3 5 16 to 25 2 2 3 3 3 5 8 26 to 50 2 3 3 5 5 8 13 51 to 90 3 3 5 5 5 13 20 91 to 150 3 3 5 8 8 20 32 151 to 280 3 5 8 13 13 32 50 281 to 500 3 5 8 13 20 50 80 501 to 1 200 5 5 13 20 32 80 125 1 201 to 3 200 5 8 13 32 50 125 200 3 201 to 10 000 5 8 20 32
45、 80 200 315 10 001 to 35 000 5 8 20 50 125 315 500 35 001 to 150 000 8 13 32 80 200 500 800 150 001 to 500 000 8 13 32 80 315 800 1 250 500 001 8 13 50 125 500 1 250 2 000 4.3.3 Acceptance number The acceptance number (Ac) shall be zero and the rejection number (Re) shall be 1. 4.3.4 Tightened or re
46、duced inspection When tightened inspection or reduced inspection is applied, Table 2 shall be used to select the applicable code letter for the particular lot size and the prescribed inspection level (see ISO 2859-1, Table 1). Then, sample size shall be determined from ISO 2859-1, Table 2-B (tighten
47、ed inspection) or Table 2C (reduced inspection) by the corresponding sample size code letter. EN 61193-2:2007 7 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:13:08 GMT+00:00 2008, Uncontrolled Copy, (c) BSI Table 2 Sample size code letters Special inspectio
48、n levels General inspection levels Lot size S-1 S-2 S-3 S-4 2 to 8 A A A A A A B 9 to 15 A A A A A B C 16 to 25 A A B B B C D 26 to 50 A B B C C D E 51 to 90 B B C C C E F 91 to 150 B B C D D F G 151 to 280 B C D E E G H 281 to 500 B C D E F H J 501 to 1 200 C C E F G J K 1 201 to 3 200 C D E G H K
49、L 3 201 to 10 000 C D F G J L M 10 001 to 35 000 C D F H K M N 35 001 to 150 000 D E G J L N P 150 001 to 500 000 D E G J M P Q 500 001 D E H K N Q R 5 Acceptance and rejection 5.1 Acceptability criteria The lot shall be accepted only if no nonconforming items are found upon inspection according to Clause 4. 5.2 Disposition of rejected lots The responsibl