1、BRITISH STANDARDBS EN62333-2:2006Noise suppression sheet for digital devices and equipment Part 2: Measuring methods The European Standard EN 62333-2:2006 has the status of a British StandardICS 29.100.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g
2、3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSIBS EN 62333-2:2006This British Standard was published under the authority of the Standards Policy and Str
3、ategy Committee on 31 August 2006 BSI 2006ISBN 0 580 49084 XNational forewordThis British Standard is the official English language version of EN 62333-2:2006. It is identical with IEC 62333-2:2006.The UK participation in its preparation was entrusted to Technical Committee EPL/51, Transformers, ind
4、uctors, magnetic components and ferrite materials, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this docum
5、ent may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. U
6、sers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chan
7、ge, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 22, an inside back cover and a back cover.The BSI copyright notice dis
8、played in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 62333-2 NORME EUROPENNE EUROPISCHE NORM July 2006 CENELEC Europ
9、ean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for
10、 CENELEC members. Ref. No. EN 62333-2:2006 E ICS 29.100.10 English version Noise suppression sheet for digital devices and equipment Part 2: Measuring methods (IEC 62333-2:2006) Plaque rduisant le bruit des dispositifs et appareils numriques Partie 2: Mthodes de mesure (CEI 62333-2:2006) Rauschunter
11、drckungsschicht fr digitale Gerte und Einrichtungen Teil 2: Messverfahren (IEC 62333-2:2006) This European Standard was approved by CENELEC on 2006-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th
12、e 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 exists in two official versions (English and German).
13、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 electrotechnical committees of Austria, Belgium, Cyprus, the C
14、zech 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, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, na, Tue Nov 0
15、7 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 62333-2:2006 2 Foreword The text of document 51/853/FDIS, future edition 1 of IEC 62333-2, prepared by IEC TC 51, Magnetic components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62333-
16、2 on 2006-06-01. This Standard is to be used in conjunction with EN 62333-1. 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) 2007-03-01 latest date by which the national stand
17、ards conflicting with the EN have to be withdrawn (dow) 2009-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 62333-2:2006 was approved by CENELEC as a European Standard without any modification. _ Licensed Copy: Wang Bin, na, Tue Nov 07 01:36
18、:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 EN 62333-2:2006 CONTENTS 1 Scope.4 2 Normative references .4 3 General 4 4 Measuring methods 4.1 Intra-decoupling ratio: Rda54.2 Inter-decoupling ratio: Rde104.3 Transmission attenuation power ratio: Rtp.13 4.4 Radiation suppression ratio: Rrs.17 Anne
19、x ZA (normative) Normative references to international publications with their corresponding European publications22 Figure 1 Schematic diagram of a pair of antennas and NSS under test .5 Figure 2 A pair of antennas and NSS under test .6 Figure 3 Frequency response of coupling between a pair of ante
20、nnas .6 Figure 4 Recommended examples of small loop antennas for the measurement 7 Figure 5 Cross sectional view of the measuring configuration8 Figure 6 Schematic diagram of the measuring configuration9 Figure 7 Schematic diagram of a pair of loop antennas and test sample11 Figure 8 Schematic diagr
21、am of a pair of antenna and test sample .11 Figure 9 Schematic diagram of the measuring configuration12 Figure 10 Schematic diagram of the measuring method for transmission attenuation power ratio Rtp.14 Figure 11 Data examples of the measurement results.16 Figure 12 Measurement system diagram of Rr
22、s.17 Figure 13 Schematic diagram of test fixture 17 Figure 14 Size and structure of test fixture .18 Figure 15 Test sample attachment on test fixture20 Figure 16 Test fixture setup on turntable 20 Table 1 Merits and limitations of the recommended antennas8 Table 2 Dimensions of loop antennas .8 Tabl
23、e 3 Dimensions of test sample.9 Table 4 Dimensions of loop antennas .12 Table 5 Dimensions of test fixture 14 Table 6 Dimensions of test sample.15 Table 7 Dimensions of test fixture 18 Table 8 Dimensions of test sample.19 Licensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled
24、Copy, (c) BSIEN 62333-2:2006 4 NOISE SUPPRESSION SHEET FOR DIGITAL DEVICES AND EQUIPMENT Part 2: Measuring methods 1 Scope This part of IEC 62333 specifies the methods for measuring the electromagnetic characteristics of a noise suppression sheet. Those methods are intended to provide useful and rep
25、eatable measurements to characterize the performance of the noise suppression sheets, so that manufacturers and their customers are able to obtain the same results. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references,
26、 only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment) applies. IEC 62333-1, Noise suppression sheet for digital devices and equipment Part 1: Definitions and general properties CISPR 16-1, Specification for radio disturbance
27、and immunity measuring apparatus and methods Part 1: Radio disturbance and immunity measuring apparatus CISPR 22, Information technology equipment Radio disturbance characteristics Limits and methods of measurement 3 General Electromagnetic interference between electronic devices, and emission of ra
28、diation from electronic devices are caused, in part, by RF current generated by active devices which are driven at high frequency. Printed-circuit board (PCB), devices mounted on the PCB, and all other connected circuits or cables can act as antennas to radiate the RF noise. Levels of the electromag
29、netic interference and the emission are proportional to the RF current, and are also affected significantly by PCB design, radiation efficiency of the antennas, and noise coupling coefficients between the devices and the antennas. The noise suppression sheet (NSS) is used for decoupling of the noise
30、 path, suppressing RF noise current, and reducing radiation. The noise suppression effect of the NSS can be evaluated by four parameters. They are defined as intra-decoupling ratio (Rda), inter-decoupling ratio (Rde), transmission attenuation power ratio (Rtp) and radiation suppression ratio (Rrs).
31、A pair of antennas is held close to each other for the measuring intra-decoupling ratio (Rda) and inter-decoupling ratio (Rde). One antenna acts as a noise source and another one as a receiver. Both decoupling ratios are derived from comparison before and after the NSS is installed nearby the antenn
32、as. These measuring procedures represent practical configurations of the NSS. Practically, the NSS is installed near the noise source or the noise interfered part, inside of the electronic equipments. Licensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 EN 62
33、333-2:2006 A micro-strip line (MSL) test fixture is used for the measuring transmission attenuation power ratio (Rtp) as a transmission line that would be a noise path. The ratio is derived from comparison before and after the NSS installation. This measuring procedure represents another practical c
34、onfiguration that the NSS is utilized for reducing the RF current along the transmission line. The MSL test fixture is also used for measuring radiation suppression ratio (Rrs) as the antenna. The ratio is derived from a comparison before and after the NSS installation. This measuring procedure repr
35、esents another practical configuration that the NSS is utilized for reducing the radiation from the antenna. 4 Measuring methods 4.1 Intra-decoupling ratio: Rda4.1.1 Principle The following measuring method is applied for evaluating a reduction of coupling between lines or circuit boards on one side
36、 of the NSS, from 100 MHz to 6 GHz. A pair of loop antennas is employed. One is for noise source and the other one for receiver. They are simulating a general electromagnetic interference situation that often exists inside electronic equipment (see Figure 1). The NSS is placed so that the centre of
37、the antenna pair comes to the centre of the NSS. The coupling between two antennas with the NSS is measured, as well as the coupling without the NSS as a reference value. Consequently, intra-decoupling ratio Rda(dB) can be obtained. RF magnetic field raised by one antenna is coupled with another one
38、 (see Figure 2a). By setting the NSS, the antennas (see Figure 2b), a part of the magnetic flux is led to the NSS, and the coupling is reduced by electromagnetic loss in the material. Magnetic fluxLoop antennas Network analyzer NSS Coaxial cable IEC 637/06 Figure 1 Schematic diagram of a pair of ant
39、ennas and NSS under test Licensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 62333-2:2006 6 Figure 2a Loop antennas Magnetic flux Figure 2b NSS under test NSS IEC 638/06 IEC 639/06 Figure 2 A pair of antennas and NSS under test 4.1.2 Apparatus Figure 1 shows
40、 the schematic diagram of the measuring method of intra-decoupling ratio. NOTE The test sample and the loop antennas are set at least 30 mm away from any other material except for the coaxial cable, using low dielectric and low loss material such as the styrene foam and air gap. Small loop antennas
41、shall be used for the generation of the RF magnetic field and the detection of the magnetic flux. The S21of the ideal loop antenna pair is proportional to the frequency. This means that S21increases 20 dB with the decade of frequency. The usable frequency range of the loop antenna is defined by the
42、deviation of S21from the theoretical value. The deviation should be less than 3 dB as shown in Figure 3. Coupling S21Theoretical 20 dB/decade3 dB +3 dB f/10 f 10f 20 dB 20 dB Frequency IEC 640/06 Figure 3 Frequency response of coupling between a pair of antennas Several loop antenna designs shown in
43、 Figure 4 are capable of achieving the 20 dB/decade frequency response that defines a valid Rda/Rdemeasurement. 4.1.2.1 Loop antenna Recommended examples of the small antennas are shown in Figure 4. Merits and limitations of recommended examples of the antennas are described in Table 1. Licensed Cop
44、y: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 EN 62333-2:2006 Figure 4b Shielded loop antenna with slit and 50 termination 50 termination Connector Semi-rigid cable Slit Loop antenna Soldering Figure 4c One turn antenna with ferrite beads Connector Ferrite beads F
45、igure 4d Shielded coaxial antenna with slit Slit a/10 Connector Figure 4a Shielded multi-layered antenna with slit 2ndlayer 1st/3rdlayer Via hole Slit a/10 Substrate Connector IEC 641/06 IEC 642/06 Semi-rigid cable Connector 50 termination Figure 4e Shield loop antenna with electrical shorting plate
46、 Slit Electrical shorting plate IEC 644/06 IEC 643/06 IEC 645/06 Figure 4 Recommended examples of small loop antennas for the measurement Licensed Copy: Wang Bin, na, Tue Nov 07 01:36:58 GMT+00:00 2006, Uncontrolled Copy, (c) BSIEN 62333-2:2006 8 Table 1 Merits and limitations of the recommended ant
47、ennas Loop antenna type Frequency range (approx.) GHz Fabrication Materials a) Shielded multi-layer antenna with slit 0,1 to 3 PCB manufacturing process required PCB material Ex. FR-4 b) Shielded loop antenna with 50 termination 0,1 to 6 Engineering skills required Semi-rigid cable c) One turn anten
48、na with ferrite beads 0,1 to 2 Easy Semi-rigid cable Ferrite beads Ex. NiCuZn ferrite d) Shielded coaxial antenna with slit 0,1 to 2 Easy Semi-rigid cable e) Shield loop antenna with electrical shorting plate 0,1 to 6 Easy Semi-rigid cable Slit width shown in Figures 4a), b), d) and e) shall be less
49、 than a/10, where ais average diameter of the loop antenna. A pair of loop antennas shall be arranged as shown in Figure 5. The dimensions of loop antennas are specified as shown in Table 2. HaTest sample DLoop antennas IEC 646/06 D is the distance between centres of the loop antennas; ais the average diameter of the loop antenna; H is the clearance between test sample and the antenna surface; is the angle
