EN 60512-23-3-2001 en Electromechanical Components for Electronic Equipment - Basic Testing Procedures and Measuring Methods Part 23-3 Test 23c Shielding Effectiveness of Connector.pdf

1、BRITISH STANDARD BS EN 60512-23-3: 2001 IEC 60512-23-3: 2000 Incorporating Corrigendum No. 1 Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part 23-3: Test 23c: Shielding effectiveness of connectors and accessories The European Standard EN 60512-

2、23-3:2001 has the status of a British Standard ICS 31.220.01 BS EN 60512-23-3:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 20 Aug

3、ust 2003 ISBN 0 580 38159 5 National foreword This British Standard is the official English language version of EN 60512-23-3:2001. It is identical with IEC 60512-23-3:2000, including Corrigendum April 2003. The UK participation in its preparation was entrusted by Technical Committee EPL/48, Electro

4、mechanical components for electronic equipment, to Subcommittee EPL/48/2, Connectors for electronic equipment, which has the responsibility to: A list of organizations represented on this Subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement

5、 international or European publications referred to in this document 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 no

6、t purport to include all the necessary provisions of a contract. Users 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 co

7、mmittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 t

8、o 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 14511 Corrigendum No. 1 20 August 2003 Change to 6.2EUROPEAN STANDARD EN 60512-23-3 NORME EUROPENNE EUROPISCHE NORM Febru

9、ary 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means

10、reserved worldwide for CENELEC members. Ref. No. EN 60512-23-3:2001 E ICS 31.220.01 Incorporating corrigendum April 2003 English version Electromechanical components for electronic equipment - Basic testing procedures and measuring methods Part 23-3: Test 23c: Shielding effectiveness of connectors a

11、nd accessories (IEC 60512-23-3:2000) Composants lectromcaniques pour quipements lectroniques - Procdures dessai de base et mthodes de mesure Partie 23-3: Essai 23c: Efficacit de blindage des connecteurs et des accessoires (CEI 60512-23-3:2000) Elektrisch-mechanische Bauelemente fr elektronische Einr

12、ichtungen - Me- und Prfverfahren Teil 23-3: Prfung 23c: Schirmwirkung von Steckverbindern und Zubehr (IEC 60512-23-3:2000) This European Standard was approved by CENELEC on 2001-01-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi

13、ving 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 exists in three official

14、 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 electrotechnical committe

15、es of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 48B/941/FDIS, future edition 1 of IEC 60512-23-3, prepared by SC 48B, Con

16、nectors, of IEC TC 48, Electromechanical components and mechanical structures for electronic equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60512-23-3 on 2001-01-01. The following dates were fixed: latest date by which the EN has to be implemented at nati

17、onal level by publication of an identical national standard or by endorsement (dop) 2001-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-01-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annex ZA is

18、normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60512-23-3:2000 was approved by CENELEC as a European Standard without any modification. _ Page2 EN60512233:2001CONTENTS Page Clause 1 Scope and object4 2 Normative references.5 3 Test meth

19、od.5 3.1 Test requirements.5 3.2 Test screen diameter.5 3.3 Applicable frequency range.6 4 Test equipment.6 5 Preparation of the test sample under test .7 5.1 Circular connectors.7 5.2 Rectangular connectors.8 5.3 Connectors for printed boards .9 5.4 Impedance matching of primary and secondary circu

20、it.9 5.5 Preparation of the secondary circuit 9 5.6 Adaptation of the primary circuit 9 5.7 Calibration of test set-up .10 6 Measurement of shielding effectiveness .11 6.1 Measurement 11 6.2 Method of calculating attenuation 11 7 Requirements.12 8 Details to be specified 12 Figure 1 Principle of lin

21、e injection method4 Figure 2 Installation of test set-up7 Figure 3 Example of test set-up for circular connectors8 Figure 4 Example of test set-up for shielded rectangular connectors8 Figure 5 Example of test set-up for shielded printed board connectors.9 Figure 6 Calibration set-up.10 Figure 7 Exam

22、ple of a shielding attenuation plot12 Table 1 Requirements for transfer impedance6 Annex ZA (normative) Normative references to international publications with their corresponding European publications .13 Page3 EN60512233:2001ELECTROMECHANICAL COMPONENTS FOR ELECTRONIC EQUIPMENT BASIC TESTING PROCE

23、DURES AND MEASURING METHODS Part 23-3: Test 23c: Shielding effectiveness of connectors and accessories 1 Scope and object This part of IEC 60512 defines a standard test method for measuring the shielding effec- tiveness of a connector, or a connector fitted with an accessory and terminated with a ca

24、ble. The complete assembly has a continuous 360shielding capability throughout its length. This test method utilizes the principle that the intrinsic shielding property of the connector/ accessory/cable assembly is its surface transfer impedance which can be expressed as the longitudinal voltage ins

25、ide the shield, relative to the current flow on the outside shell. The test method is based on two impedance matched circuits. See figure 1 for the measurement principle. The connector under test is integrated into the secondary circuit 02. The impedance matched injection line of the primary circuit

26、 01, which activates the electromagnetic field, runs parallel to the surface of the test sample under test. This test is suitable for measuring the shielding effectiveness of a connector fitted with triaxial contacts terminated with shielded, twisted pair cables as used in data bus systems. NOTE Thi

27、s standard has been adopted by AECMA as EN 2591-212 and, as such, should not be amended without direct consultation and liaison with the AECMA organization. Injection line Coupling section Primary circuit Signal generator Receiver Test specimen Secondary circuit L Z 01 Z 02 Z 02 Z 02 Z 01 P 2f P 2n

28、Z n P 1 IEC 2578/2000Key Z 01 characteristic impedance, primary circuit Z 02 characteristic impedance, secondary circuit L length of coupling section P1 power, primary circuit P2f power, far end, secondary circuit P2n power, near end, secondary circuit Figure 1 Principle of line injection method Pag

29、e4 EN60512233:20012 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60512. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, part

30、ies to agreements based on this part of IEC 60512 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain r

31、egisters of currently valid International Standards. IEC 60096-4-1:1990, Radio-frequency cables Part 4: Specification for superscreened cables Section 1: General requirements and test methods 3 Test method 3.1 Test requirements This method is based on IEC 60096-4-1 and the sample under test shall be

32、 tested with the cables installed. However, reference to 12.1.6.1 and 12.1.6.3 shall be made to ensure that an electrical short length is maintained and that a minimum of four points around the circum- ference of the specimen under test are measured. This test method can be applied to connectors and

33、 accessories with outer shielding capability. The following different connector designs can be tested: circular connectors; rectangular connectors; connectors for printed boards; connector accessories. The line injection method provides a means of obtaining two balanced and matched transmission line

34、s. This is achieved by selecting an inner pick-up line through the sample under test to provide an impedance match as close as possible to 50 relative to the sample under test. The second outer transmission line is achieved by laying an injection wire along the length of the sample under test, this

35、also being adjusted to provide an impedance match as close as possible to 50 relative to the sample under test. It is important to ensure there is no earth loop between the signal source and the measuring equipment. 3.2 Test screen diameter The surface transfer impedance of the screen installed for

36、the test shall comply with the requirements of table 1 and shall have an outside diameter of not less than 90 % of the inside diameter of the cable accessory outlet. Page5 EN60512233:2001Table 1 Requirements for transfer impedance Test screen diametermm Maximum surface transfer impedance of screen m

37、 /m at 30 MHz 2 4,9 5 9,9 10 17,9 18 23,9 24 29,9 30 40+ 70 45 35 20 10 5 NOTE These values have been chosen in order that the leakage of the shield is not dominant in the overall result. 3.3 Applicable frequency range The applicable frequency range is 10 kHz up to 1 GHz. The maximum applicable freq

38、uency is dependent on the test set-up and the dimensions of the sample under test. The upper frequency limit can be calculated as c r1 r2 = L f c = 3 10 8m/s L is the length of the sample under test r1is the dielectric constant of the primary circuit r2is the dielectric constant of the secondary cir

39、cuit 4 Test equipment Network analyser or signal generator and receiver Power splitter (as required) Attenuators (as required) Termination loads Test adapter Time domain reflectometer (TDR) Insulated copper foil or multi-conductor ribbon cable for the injection line construction. Page6 EN60512233:20

40、01Network analyser Power splitter Shielding tube Termination load Injection line Test specimen A1 F D D A2 Out Ref. In Shielding tube IEC 2579/2000Key A1 Coupling box A2 Termination box D Launchers for injection line F Feeding cables for primary circuit Figure 2 Installation of test set-up 5 Prepara

41、tion of the test sample under test In all applications when testing accessories, the shielding tube is subsituted with the accessory to be tested. 5.1 Circular connectors The connector shells are mounted on the r.f. proof-shielding tubes. The total length of the sample under test acts as the couplin

42、g section. Figure 3 shows an example of a test set-up for circular connectors. The coupling of the injection line is carried out by semi-rigid coaxial cables with appropriate termination load for the feeding cable of the signal generator. The outer conductor of the semi-rigid cable and the shielding

43、 tube are connected by soldering. The injection line shall be isolated from the conductive surfaces of the connector shells. Therefore, for impedance matching, a suitable dielectric has to be chosen. Page7 EN60512233:2001Dielectric for injection line 50 termination load Semi-rigid cable Injection li

44、ne To signal generator Shielding tube To receiver Test specimen : shielding circular connectors Semi-rigid cable Shielding tube 50 termination load IEC 2580/2000Figure 3 Example of test set-up for circular connectors 5.2 Rectangular connectors For rectangular connectors in shielded shells, the shiel

45、ding tubes or equivalent shielded cables are coupled to the cable retention of the connector shells which is r.f. proof. The coupling section extends over the total length of both shells in the direction of the signal path. If the connector interface is mounted to a shielded shell only on one side,

46、the adaptor shall have a separate outer shielding. In figure 4, an example of a test set-up for shielded rectangular connectors is shown. Semi- rigid coaxial cables are used for coupling of the injection line, which is isolated from the sample under test by a suitable dielectric, if necessary. 50 te

47、rmination load Dielectric for injection line (if necessary) To signal generator Injection line Semi-rigid cable Test specimen: rectangular connectors in shielded shells Shielding tube To receiver Semi-rigid cable Shielding tube 50 termination load IEC 2581/2000Figure 4 Example of test set-up for shi

48、elded rectangular connectors Page8 EN60512233:20015.3 Connectors for printed boards Connectors for printed boards can only be tested with the aid of the line injection method, if there are additional outer shielding structures for the PCBs. These can be achieved by a suitable shielded box, printed b

49、oards with shielding on both sides or equivalent constructions. Figure 5 shows a test set-up for printed board connectors. The injection line with suitable dielectric for isolation and impedance matching is coupled to the semi-rigid coaxial cable. For termination, a 50 SMD-resistor is used, which is mounted on the