EN 61000-4-21:2011

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 General
5 Test environments and limitations
6 Applications
7 Test equipment
8 Chamber calibration
9 Testing
10 Test results, test report and test conditions
Annex A (informative) - Reverberation chamber overview
Annex B (normative) - Chamber validation for mode-tuned
        operation
Annex C (normative) - Chamber validation and testing for
        mode-stirred operation
Annex D (normative) - Radiated immunity tests
Annex E (normative) - Radiated emissions measurements
Annex F (informative) - Shielding effectiveness
        measurements of cable assemblies, cables,
        connectors, waveguides and passive microwave
        components
Annex G (informative) - Shielding effectiveness measurements
        of gaskets and materials
Annex H (informative) - Shielding effectiveness measurements
        of enclosures
Annex I (informative) - Antenna efficiency measurements
Annex J (informative) - Direct evaluation of reverberation
        performance using field anisotropy and field
        inhomogeneity coefficients
Annex K (informative) - Measurement uncertainty for chamber
        validation - Emission and immunity testing
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

IEC 61000-4-21:2011 considers tests of immunity and intentional or unintentional emissions for electric and/or electronic equipment and tests of screening effectiveness in reverberation chambers. It establishes the required test procedures for performing such tests. Only radiated phenomena are considered. The objective of IEC 61000-4-21:2011 is to establish a common reference for using reverberation chambers to evaluate the performance of electric and electronic equipment when subjected to radio-frequency electromagnetic fields and for determining the levels of radio-frequency radiation emitted from electric and electronic equipment. IEC 61000-4-21:2011 does not intend to specify the tests to be applied to a particular apparatus or system. Its main aim is to give a general basic reference to all concerned product committees of the IEC. The product committees should select emission limits and test methods in consultation with CISPR. The product committees remain responsible for the appropriate choice of the immunity tests and the immunity test limits to be applied to their equipment. Other methods, such as those covered in IEC 61000-4-3, CISPR 16-2-3 and CISPR 16-2-4 may be used. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision and includes the following significant technical changes with respectto the first edition: - In Clause 8, the use and specifications of E-field probes for application to reverberation chambers has been added. - In Annex A, additional guidance and clarifications on the use of reverberation chambers at relatively low frequencies of operation (i.e., close to the lowest usable frequency of a given chamber) are given, and its implications on the estimation of field uncertainty are outlined. - In Annex B, symmetric location of the field probes when the chamber exhibits cylindrical symmetry has been disallowed, as such placement could otherwise yield a false indication of field uniformity and chamber performance at different locations. - Annex C now contains more quantitative guidance on the setting of the maximum permissible stirring speeds that warrant quasi-static conditions of operation for chamber validation and testing. - In Annex D, a requirement for the EUT and equipment not to occupy more than 8 % of the total chamber volume in immunity testing has been added. - Annex E has been extended with further guidance on the value of EUT directivity to be used in the estimation of radiated power and field. - In Annex I, some clarifications on antenna efficiency measurements have been added. - A new Annex K has been added that covers measurement uncertainty in reverberation chambers.