1、 TECHNICAL REPORT CISPR16-4-5First edition2006-10Specification for radio disturbance and immunity measuring apparatus and methods Part 4-5: Uncertainties, statistics and limit modelling Conditions for the use of alternative test methods Reference number CISPR 16-4-5/TR:2006(E) INTERNATIONAL SPECIAL
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8、rvice Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00 TECHNICAL REPORT CISPR16-4-5First edition2006-10Specification for radio disturbance and immunity measuring apparatus and methods Part 4-5: Uncertainties, statistics and limit modelling Conditions for the use of alternati
9、ve test methods For price, see current catalogue IEC 2006 Copyright - all rights reserved 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 the publisher. Internati
10、onal Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch XCommission Electrotechnique InternationaleInternational Electrotechnical Commission PRICE CODE INTERNATIONAL SPECI
11、AL COMMITTEE ON RADIO INTERFERENCE 2 TR CISPR 16-4-5 IEC:2006(E) CONTENTS FOREWORD.4 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 4 Symbols and abbreviated terms7 5 Introduction 8 6 Procedure to derive limits for an alternative test method.9 6.1 Overview .9 6.2 Select the reference
12、 quantity X12 6.3 Describe the test methods and measurands 12 6.4 Determine the deviations of the measured quantities from the reference quantity .13 6.5 Determine the average values of the deviations 13 6.6 Estimate the standard uncertainties of the test methods14 6.7 Estimate the expanded uncertai
13、nties of the test methods 15 6.8 Calculate the average conversion factor16 6.9 Verify the calculated values.17 6.10 Apply the conversion .17 Annex A (informative) Remarks on EUT modelling .18 Annex B (informative) Examples of application of the test method comparison procedure .19 Bibliography49 Fig
14、ure 1 Overview of quantities to estimate for use in conversion procedure10 Figure 2 Overview of limit conversion procedure using estimated quantities.11 Figure B.1 Example reference quantity 19 Figure B.2 EUT and antenna set-up for fully anechoic room emission measurement 20 Figure B.3 EUT and anten
15、na set-up for open-area test site measurement20 Figure B.4 Radiation characteristics of elementary radiator (left), and scheme of EUT-model (right) .21 Figure B.5 Maximum average deviations for 3 m FAR (top) and 10 m OATS (bottom) 24 Figure B.6 Sample cumulative distribution function 26 Figure B.7 U
16、ncertainties due to the unknown EUT characteristic for 3 m FAR (top) and 10 m OATS (bottom) 28 Figure B.8 Expanded uncertainties (k = 2) of alternative (3 m FAR, top) and established (10 m OATS, bottom) test methods 32 Figure B.9 Maximum average conversion factors for different volumes 33 Figure B.1
17、0 Photo (left) and cut-view of simulation model (right) of the specimen EUT 35 Figure B.11 Deviations of the specimen EUT: 3 m fully anechoic room (top) and 10 m open area test site (bottom)36 Figure B.12 Sample FAR measurement .37 Figure B.13 OATS 10 m limit line converted to FAR 3 m conditions37 T
18、R CISPR 16-4-5 IEC:2006(E) 3 Figure B.14 Expanded uncertainties.37 Figure B.15 Comparison of the measured values with the corrected converted limit.38 Figure B.16 EUT and antenna set-up of 3 m open area test site measurement.39 Figure B.17 Maximum average deviations for 3 m OATS40 Figure B.18 Uncert
19、ainties due to the unknown EUT characteristic for 3 m OATS41 Figure B.19 Expanded uncertainties (k = 2) of alternative test method OATS (3 m)43 Figure B.20 Maximum average conversion factors .44 Figure B.21 Deviations of the specimen EUT: Open area test site (3 m).46 Figure B.22 Sample OATS (3 m) me
20、asurement47 Figure B.23 OATS (10 m) limit line converted to OATS (3 m) conditions 47 Figure B.24 Expanded uncertainties.48 Figure B.25 Comparison of the corrected values with the converted limit .48 Table 1 Summary of steps in conversion procedure .9 Table 2 Overview of quantities and defining equat
21、ions for conversion process.12 Table B.1 Instrumentation uncertainty of the 3 m fully anechoic chamber test method .25 Table B.2 Uncertainties in dB due to the unknown EUT characteristic for 3 m FAR 30 Table B.3 Uncertainties in dB due to the unknown EUT characteristic for 10 m OATS31 Table B.4 Maxi
22、mum average conversion factors in dB between 10 m OATS and 3 m FAR .34 Table B.5 Uncertainties in dB due to the unknown EUT characteristic for 3 m OATS42 Table B.6 Maximum average conversion factors in dB between 10 m and 3 m OATS.45 4 TR CISPR 16-4-5 IEC:2006(E) INTERNATIONAL ELECTROTECHNICAL COMMI
23、SSION _ SPECIFICATION FOR RADIO DISTURBANCE AND IMMUNITY MEASURING APPARATUS AND METHODS Part 4-5: Uncertainties, statistics and limit modelling Conditions for the use of alternative test methods FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standard
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34、 is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. CISPR 16-4-5, which is a technic
35、al report, has been prepared by CISPR subcommittee A: Radio-interference measurements and statistical methods. The text of this technical report is based on the following documents: Enquiry draft Report on voting CISPR/A/665/DTR CISPR/A/685/RVC Full information on the voting for the approval of this
36、 technical report can be found in the report on voting indicated in the above table. TR CISPR 16-4-5 IEC:2006(E) 5 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the CISPR 16-4 series, published under the general title Specification for ra
37、dio disturbance and immunity measuring apparatus and methods Part 4: Uncertainties, statistics and limit modelling, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site u
38、nder “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 TR CISPR 16-4-5 IEC:2006(E) SPECIFICATION FO
39、R RADIO DISTURBANCE AND IMMUNITY MEASURING APPARATUS AND METHODS Part 4-5: Uncertainties, statistics and limit modelling Conditions for the use of alternative test methods 1 Scope This part of CISPR 16-4 specifies a method to enable product committees to develop limits for alternative test methods,
40、using conversions from established limits. This method is generally applicable for all kinds of disturbance measurements, but focuses on radiated disturbance measurements (i.e. field strength), for which several alternative methods are presently specified. These limits development methods are intend
41、ed for use by product committees and other groups responsible for defining emissions limits in situations where it is decided to use alternative test methods and the associated limits in product standards. 2 Normative references IEC 60050-161, International Electrotechnical Vocabulary (IEV) Chapter
42、161: Electromagnetic compatibility CISPR 16-4-1:2003, Specification for radio disturbance and immunity measuring apparatus and methods Part 4-1: Uncertainties, statistics and limit modelling Uncertainty in standardized EMC tests CISPR 16-4-2:2003, Specification for radio disturbance and immunity mea
43、suring apparatus and methods Part 4-2: Uncertainties, statistics and limit modelling Uncertainty in EMC measurements 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-161 and the following apply. 3.1 established test method test method described
44、in a basic standard with established emissions limits defined in corresponding product or generic standards. An established test method consists of a specific test procedure, a specific test set-up, a specific test facility or site, and an established emissions limit NOTE The following test methods
45、have been considered to be established test methods in CISPR: conducted disturbance measurements: test method defined in CISPR 16-2-1:2003, Clause 7; radiated disturbance measurements up to 1 GHz: the test method defined in CISPR 16-2-3, 7.2.1; radiated disturbance measurements up to 18 GHz: the tes
46、t method defined in CISPR 16-2-3, 7.3. 3.2 alternative test method test method described in a basic standard without established emissions limits. The alternative test method is designed for the same purpose as the established test method. An alternative test method consists of a specific test proce
47、dure, a specific test set-up, a specific test facility or site, and a derived emissions limit that was determined by the application of the proposed method stated in this document TR CISPR 16-4-5 IEC:2006(E) 7 3.3 established limit limit having “many years” of good protection of radio services. NOTE
48、 An example is radiated field strength measured on OATS, developed to protect radio services as described in CISPR 16-3. 3.4 derived limit limit applicable for the alternative test method, derived by appropriate conversion from the established limit and expressed in terms of the misbrands 3.5 conver
49、sion factor K for a given EUT or type of EUT, the relation of the measured value of the established test method to the measured value of the alternative test method NOTE The terms measured and calculated are used interchangeably at various places in this document to describe actual laboratory tests and computer simulations. 3.6 reference quantity X the basic parameter which determi
