SANS 3951-1-2008 Sampling procedures for inspection by variables Part 1 Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection gle.pdf
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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21188-2 SANS 3951-1:2008 Edition 1 ISO 3951-1:2005 Edition 1SOUTH AFRICAN NATIONAL STANDARD Sampling procedures for inspection by variable
4、s Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL This national standard is the identical implementation of ISO 3951-1:2005 and is adopted with the permission of the International
5、 Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa This standard may only be used and printed by approved subscriptio
6、n and freemailing clients of the SABS.SANS 3951-1:2008 Edition 1 ISO 3951-1:2005 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA TC 169, Applications of statistical methods, in accordance with procedures of Stan
7、dards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in April 2008. This standard may only be used and printed by approved subscription and freemailing clients of the SABS. Reference number ISO 3951-1:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 395
8、1-1 First edition 2005-04-01 Sampling procedures for inspection by variables Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL Rgles dchantillonnage pour les contrles par mesures Pa
9、rtie 1: Spcifications pour les plans dchantillonnage simples indexs daprs le niveau de qualit acceptable (NQA) pour le contrle lot par lot pour une caractristique de qualit unique et un NQA unique SANS 3951-1:2008This standard may only be used and printed by approved subscription and freemailing cli
10、ents of the SABS.ISO 3951-1:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the
11、 editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file ca
12、n be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretaria
13、t at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address
14、below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedSANS 3951-1:2008This standard may only be use
15、d and printed by approved subscription and freemailing clients of the SABS.ISO 3951-1:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword. v Introduction vii 1 Scope 1 2 Normative references . 2 3 Terms and definitions. 2 4 Symbols . 5 5 Acceptance quality limit (AQL) 7 5.1 Principle . 7
16、5.2 Use 7 5.3 Specifying AQLs . 7 5.4 Preferred AQLs 7 5.5 Caution. 7 5.6 Limitation . 7 6 Switching rules for normal, tightened and reduced inspection. 7 7 Relation to ISO 2859-1 8 7.1 Similarities . 8 7.2 Differences. 8 8 Limiting quality protection. 9 8.1 Use of individual plans. 9 8.2 Consumers
17、risk quality tables 9 8.3 Producers risk tables. 9 8.4 Operating characteristic curves 9 9 Planning . 10 10 Choice between variables and attributes .10 11 Choice between the “s” and “ ” methods . 11 12 Choice of inspection level and AQL 11 13 Choice of sampling plan. 11 13.1 Standard plans 11 13.2 S
18、pecial plans . 12 14 Preliminary operations . 12 15 Standard procedure for the “s” method. 12 15.1 Obtaining a plan, sampling and preliminary calculations 12 15.2 Acceptability criteria for single specification limits 13 15.3 Graphical method for a single specification limit 14 15.4 Acceptability cr
19、iterion for combined control of double specification limits 15 16 Standard procedure for the “ ” method. 21 16.1 Obtaining a plan, sampling and preliminary calculations 21 16.2 Acceptability criteria for a single specification limit. 21 16.3 Acceptability criterion for combined control of double spe
20、cification limits 22 17 Procedure during continuing inspection23 18 Normality and outliers 24 18.1 Normality 24 18.2 Outliers. 24 SANS 3951-1:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 3951-1:2005(E) iv ISO 2005 All rights reserved
21、19 Records 24 19.1 Control charts24 19.2 Lots that are not accepted24 20 Operation of switching rules24 21 Discontinuation and resumption of inspection25 22 Switching between the “s” and “ ” methods.25 22.1 Estimating the process standard deviation25 22.2 State of statistical control 26 22.3 Switchi
22、ng from the “s” method to the “ ” method26 22.4 Switching from the “ ” method to the “s” method26 23 Chart A Sample-size code letters of standard single sampling plans for specified quality levels 26 24 Charts B to R (Figures 5 to 19) Operating characteristic curves and tabulated values for sample-s
23、ize code letter B to R: “s” method .28 25 Charts s-D to s-R (Figures 20 to 32) Acceptance curves for combined control of double specification limits: “s” method56 Annex A (normative) Tables for determining the appropriate sample size69 Annex B (normative) Form k single sampling plans for the “s” met
24、hod 71 Annex C (normative) Form k single sampling plans for the “” method .75 Annex D (normative) Values of f sfor maximum sample standard deviation (MSSD) .79 Annex E (normative) Values of f for maximum process standard deviation (MPSD) .83 Annex F (normative) Estimating the process fraction noncon
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