Recommendations for shielded enclosures

This Technical Report applies to shielded enclosures used for EMC testing which are to be validated according to the EN 50147 series of standards and the corresponding international standards. The object of this report is to give guidance to the selection of the shielding materials and components. The frequency range for this document is 10 kHz to 40 GHz.

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SIST-TP CLC/TR 50484:2009
SIST CLC/R 210-005:2000
Recommendations for shielded enclosures
Ta slovenski standard je istoveten z: CLC/TR 50484:2009
17.220.01 Elektrika. Magnetizem. Electricity. Magnetism.
Splošni vidiki General aspects
31.240 Mehanske konstrukcije za Mechanical structures for
elektronsko opremo electronic equipment
SIST-TP CLC/TR 50484:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CLC/TR 50484:2009

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SIST-TP CLC/TR 50484:2009

CLC/TR 50484

April 2009

ICS 17.220.01; 31.240 Supersedes R210-005:1999

English version

Recommendations for shielded enclosures

This Technical Report was approved by CENELEC on 2009-03-20.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech 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.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50484:2009 E

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SIST-TP CLC/TR 50484:2009
CLC/TR 50484:2009 – 2 –
This Technical Report was prepared by the Technical Committee CENELEC TC 210, Electromagnetic
compatibility (EMC).
The text of the draft was submitted to vote in accordance with the Internal Regulations, Part 2,
Subclause (simple majority) and was approved by CENELEC as CLC/TR 50484 on
This document supersedes R210-005:1999.

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SIST-TP CLC/TR 50484:2009
– 3 – CLC/TR 50484:2009
1 Scope .4
2 Normative references .4
3 Definitions .4
4 General .4
5 Shielding .5
5.1 Shielding attenuation.6
5.2 Evaluation of shielding effectiveness . 10
5.3 Shielding components and selection of materials . 11
5.4 Shielding attenuation values (see Figure 8 measured according to EN 50147-1) . 14
Bibliography . 16

Figure 1 – Illustrated set-up for shielding .4
Figure 2 – Wave impedance versus distance of the field source .5
Figure 3 – Schematic diagram of the partial reflections (subscript R) and transmissions
(subscript T) at the two surfaces of a shield .6
Figure 4 – S results calculated for a low-impedance magnetic field source .9
Figure 5 – Calculated S results for a low-impedance magnetic field source .9
Figure 6 – Shielding attenuation measurement. 11
Figure 7 – Examples of door contacts . 13
Figure 8 – Shows typical performance values. 14

Table 1 – Summary SE aspects .

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