1、BRITISH STANDARD Anechoic chambers Part 1. Shield attenuation measurement The European Standard EN 50147-1 : 1996 has the status of a British Standard ICs 17.220.01; 29.020 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 50147-1 : 1997 STD.BS1 BS EN 501q7-1-ENGL I777 = L
2、b24bb7 0577704 b2 This British Standard, having been prepared under the direction of the Elecirokchnicai Sector Board, was published under the authority of the Standards Board and comes into effect on 16 January 1997 O BSI 1997 Committees responsible for this British Standard The preparation of this
3、 British Standard was entrusd to Technical Committee GEY210, Electromagnetic compatibility, upon which the following bodies were represented. Association of Consuiting Scientists Association of Control Manufacturers (TACMA) (BEAMA Ltd.) Association of Manufacturem of Domestic Electrical Appliances A
4、ssociation of Manufacturem of Power Generating systems BEAMA Ltd. BEAMA Metering Association (BMA) British Industrial Ihick Association British Lighting Association for the Preparation of Standars (BRITLAPS) British Telecommunications plc Building Automation and Mains Signalling Association (BAMSA)
5、(BEAMA Ltd.) Department of Heath Department of hade and Industry (National Physical Laboratory) Department of li-ade and Industry (Standards Policy Unit) Electrical InstaMion Equipment Manufacturers Association (BEAMA Ltd.) Elechicity Association ERA Technology Ltd. Federation of the Electronics Ind
6、ustry GAMBICA (BEAMA Ltd.) Heath and Safety Executive Induction and Dielectric Heating Manufacturers Association Institution of Electrical Engineers Intemational Association of Broadcasting Manufacturers Lighting Industqy Federation Ltd. MmisQy of Defence Motor Industry Research Association National
7、 Air ?i-dffic Services Power Supply Manufacturers Association (PSMA) (BEAMA Ltd.) Professional Lighting and Sound Association Radiocommunications Agency Rotating Electrical Machines Association (BEAMA Ltd.) Society of British Gas Indushies Society of Motor Manufacturers and Mers Limited Ti.ansmissio
8、n and Distribution Association (BEAMA Ltd.) Amendments issued since publication AmdNo. IDate I Text afected The foiowing BSI references relate to the work on this standard Committee reference GELB10 Draft for comment 91B0259 DC ISBN O 580 26832 2 STD-BSI BS EN 50147-1-ENGL 1777 m Lb24bb7 0577705 AT9
9、 m BS EN 60147-1 : 1997 Contents Page Committees responsible hide front cover National foreword ii Foreword 2 Text Of EN 50147-1 3 O BSI 1997 i STD.BSI BS EN 50147-1-ENGL 1777 m 1b2Ybb7 057770b 735 m BS EN 60147-1 : 1997 National foreword This British Standard has been prepared by Technical Committe
10、e GEIL210 and is the English ianguage version of EN 50147-1 : 1996 Anechoic chumbem Part 1: ShW attenuation measumt, published by the European Committee for Electrotechnical Stanar-on (CENELEC). Cross-reference IEC 50(161) : 1990 Publication referred to Corresponding British Standard BS 4727 Glossan
11、/ of electmtechnical, poww, telecommun.ication, elecmmclI;siuig This European Standard was approved by CENELEC on 19950744. CENELEC members are bound to comply with the CENKENELEC internai Regulations which stipulate the conditions for giving this European Standard the status of a national standard
12、without any alteration. Upto-date lists and bibiiographicai references concerning such national standards may be obtained on application to the Centrai Secretariat or to any CENELEC member. This European Standard exists in three officiai versions (Enghsh, French, German). A version in any other lang
13、uage made by transkition under the responsibility of a CEN member into its own language and notified to the CenM Secretariat has the same status as the officiai versions. CENELEC members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Irelan
14、d, Ita National Security Agency Specification for RE Shielded Enclosures for Communication Equipment 6.1 Test equipment The following types of equipment shaii be used in performing the shield attenuation test, depending on the frequency range given in the specification of the enclosure. The measurem
15、ent equipment shall have c) tunable or broadband dipoles, monoples with ground planes for electric field and plane wave measurements, and horn antennas for plane waves at microwave frequencies; d) probes for joint leakage tests; e) receivers with adequate sensitivity 6.2 Acceptance tests Acceptance
16、tests shall be performed in accordance with the procedures described below and iiiusmted in figures 3 and 4. Measurements shall be taken at several positions around the enclosure as given in the specification of the enclosure. In genemi, these measurements are made before absorber installation. If t
17、he ambient noise level is low enough, all tests should be run with the receiver outside and the transmitter inside the enclosure. 6.2.1 Leakage test Prior to acceptance tests leakage tests should be made all around the door frame, through accessible joints, around the filters and ail around the air
18、ducts. In addition, the magnitude and location of the maximum signal level emanating from the enclosure should be found by moving the antennas to at least four locations, preferably on different walls. 6.2.2 Electric and magnetic field measurements Electric and magnetic field attenuation tests (refe
19、rence measurements) shall be made with the antennas located directly opposite each other and separated by a distance shown in figures 3 and 4 plus the wall thiclaiess. O BSI 1997 STD-BSI BS EN 50347-3-ENGL 3777 m 3b24bbl 0577932 T37 m Page 6 EN 60147-1 : 1996 Loop Antenna 70 cm 0 if not avaible a ra
20、nge of YO . 70cm is tolerable placed paalkl to wall / Ll Shi e Id e d cable E N C L O S U w E W A L L J Loop Antenna (same Diameter as L1) parallel to wall, opposite L1 NOTE. For electric field measurements in this range, use same Set-up but substitute loop antennas with suitable monopoles with grou
21、nd plane. Figure 3. Test Set-up for magnetic (electric) field measurement Magnetic fields shall be measured with the loops parallel to a wall panel directly opposite each other. Recommended test mencies for magnetic fields are 10 kHz, loOIrHZ, lMHz, 10 MHz and30MHz and 10 MHz and 30 MHz for electric
22、 field 6.2.3 Plane wave measurements Measurements shall be taken at the frquencies 100 MHz, 400 MHz, 1 GHz, 10 GHz and 40 GHz at least, depending on the frequency range given in the specincation of the enclosure. The test Set-up is shown in figure 4. 6.3 Reference level When undertaking the referenc
23、e measurement it is important to note that in many countries the trammision of radio frequency energy is licensed and reference must be made to the country authority to determine if any such reguiaions apply After the country requirements have been satisfied the reference measurement shall be made i
24、n the following manner. The reference level shall be recorded with the outside antenna position unchanged and the inside antenna moved outside and positioned opposite plus a distance equivalent to the wail thickness. The value of signai levels may be recorded in decibels dB1 reMve to 1 microvolt or
25、1 mW. If local country provisions preclude the determimion of the reference level as described above, alteniatve methods may be used provided these give technically equivalent results. O BSI 1997 STD-BSI BS EN 50147-1-ENGL 1977 = Lb24bb7 0579713 975 Page 7 EN 50147-1 : 1996 Al Antenna (hom or parabo
26、lic dish) for microwaves. broadband horizontai dipole. parallel to wail, for lower frequencies Shielded cable Recommended distance -L E N C L O S U R E W A L L df 4 Antenna (Same type as Al) A2 Shielded cable Planewave dm 1 m 30 MHr . 1 GHr d= 30 cm 1 GHz . 40 GHz Figure 4. Test set-up for plane wav
27、e measurements (30 MHz - 40 GHz) * * Ln O BSI 1997 STD-BSI BS EN 5OL47-L-ENGL 1777 m lb24bb7 0577714 BO1 m BS EN 60147-1 : 1997 List of references See national foreword. * rn * O BSI 1997 BS EN 50147-1 : 1997 BSI 389 Chiswic, High Roa London w4 4AL BSI - British Standards Institution BSI is the inde
28、pendent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the intedonal level. It is incorporated by Royal Charter. Contract requirements A British Standard does not purport to include all the necessary provisions of a contract Users of
29、British Standards are responsible for their correct application. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and
30、 services. We would be grateful if anyone nding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the responsible technical committee, the identity of which can be found on the inside front cover. Tel: 0181 996 9o00, Fax: 0181 996 7400. BSI offers members an
31、individual updating service called PLUS which ensures that subscribers automatidy receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services, Sales Department at Chiswick Tel: 0181 996 7000;
32、 Fax: 0181 996 7001. in response to orders for intedonal standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and intern
33、ational standards through its Library, the Standardline Database, the BSI Information Technology Service (SlTS) and its Technid Help to Exporters Service. Contact the Information Department at Chiswick Tek 0181 996 7111; Fax: 0181 996 7048. Subscribing members of BSI are kept up to date with standar
34、ds developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Customer Services, Membership at Chiswick Tel: 0181 996 7002; Fax 0181 996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, i
35、n the UK, of the publicalions of the intrnational standadkation bodies. Except as permitted under the Copyright, Designs and Pants Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recording or otherwise - witho
36、ut prior written permission from BSI. This does not preclude the free use, in the com of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the tem may include royalty payments or a licensing agreement. Details and advice can be obtained hm the Copynght Manager, BI, 389 Chiswick High Road, London W4 4AL ISBN O 680 26832 2 GEYZ10
