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BS EN 61000-4-21:2011

BS EN 61000-4-21:2011

$215.11

Electromagnetic compatibility (EMC) – Testing and measurement techniques. Reverberation chamber test methods

Published By Publication Date Number of Pages
BSI 2011 112
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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.

PDF Catalog

PDF Pages PDF Title
7 English

CONTENTS
9 INTRODUCTION
10 1 Scope
2 Normative references
11 3 Terms, definitions and abbreviations
3.1 Terms and definitions
14 3.2 Abbreviations
15 4 General
5 Test environments and limitations
16 6 Applications
6.1 Radiated immunity
6.2 Radiated emissions
6.3 Shielding (screening) effectiveness
7 Test equipment
17 8 Chamber validation
18 9 Testing
10 Test results, test report and test conditions
19 Annex A (informative)
Reverberation chamber overview
36 Figure A.5 – Typical reverberation chamber facility
Figure A.6 – Theoretical sampling requirements for 95 % confidence
37 Figure A.7 – Normalized PDF of an electric field component at a fixed location for a measurement with a single sample
Figure A.8 – Normalised PDF of the mean of an electric field component at one fixed location for a measurement with N independent samples
38 Figure A.9 – Normalised PDF of the maximum of an electric field component at a fixed location for a measurement with N independent samples
39 Figure A.10 – Chamber working volume
Figure A.11 – Typical probe data
41 Figure A.14 – Distribution of absorbers for loading effects test
Figure A.15 – Magnitude of loading from loading effects test
42 Figure A.16 – Standard deviation data of electric field components for eight probes in the loaded chamber
43 Annex B (normative)
Chamber validation for mode-tuned operation
50 Tables

Table B.1 – Sampling requirements
Table B.2 – Field uniformity tolerance requirements
51 Figure B.1 – Probe locations for chamber validation
52 Annex C (normative)
Chamber validation and testing for mode-stirred operation
57 Figure C.1 – Received power (dBm) as a function of tuner rotation (s) at 500 MHz
Figure C.2 – Received power (dBm) as a function of tuner rotation (s) at 1 000 MHz
58 Annex D (normative)
Radiated immunity tests
62 Figure D.1 – Example of suitable test facility
63 Annex E (normative)
Radiated emissions measurements
68 Figure E.1 – Example of suitable test facility
69 Figure E.2 – Relating to the calculation of the geometry factor for radiated emissions
70 Annex F (informative) Shielding effectiveness measurements of cable assemblies, cables, connectors, waveguides and
passive microwave components
74 Annex G (informative) Shielding effectiveness measurements
of gaskets and materials
82 Figure G.1 – Typical test set-up
Figure G.2 – Typical test fixture installation for gasket and/or material testing
83 Figure G.3 – Test fixture configured for validation
84 Annex H (informative)
Shielding effectiveness measurements of enclosures
90 Figure H.1 – Typical test enclosure installation for floor mounted enclosure testing
Figure H.2 – Typical test enclosure installation for bench mounted enclosure testing
91 Annex I (informative)
Antenna efficiency measurements
93 Annex J (informative) Direct evaluation of reverberation performance using field anisotropy and field inhomogeneity coefficients
98 Table J.1 – Typical values for total field anisotropy coefficients for ‘medium’ and ‘good’ reverberation quality
99 Figure J.1 – Theoretical and typical measured distributions for field anisotropy coefficients in a well-stirred chamber
100 Figure J.2 – Theoretical and typical measured distributions for field anisotropy coefficients in a poorly stirred chamber
101 Figure J.3 – Typical measured values for field anisotropy coefficients as a function of N in a well-stirred chamber
102 Annex K (informative) M
easurement uncertainty for chamber validation – Emission and immunity testing
107 Figure K.1 – Average emitted power as a function of frequency for a typical unintentional radiator
Figure K.2 – Estimated standard uncertainty
108 Figure K.3 – Mean normalized width (in dB) of a n%
-confidence interval
Figure K.4 – Individual mean-normalized interval boundaries (in linear units) for maximum field strength as a function of the number of independent stirrer positions N
109 Bibliography

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