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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | English \n CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3 Terms, definitions and abbreviations 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.2 Abbreviations <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4 General 5 Test environments and limitations <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6 Applications 6.1 Radiated immunity 6.2 Radiated emissions 6.3 Shielding (screening) effectiveness 7 Test equipment <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 8 Chamber validation <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 9 Testing 10 Test results, test report and test conditions <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Annex A (informative) \nReverberation chamber overview <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Figure A.5 \u2013 Typical reverberation chamber facility Figure A.6 \u2013 Theoretical sampling requirements for 95\u00a0% confidence <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure A.7 \u2013 Normalized PDF of an electric field component at a fixed location for a measurement with a single sample Figure A.8 \u2013 Normalised PDF of the mean of an electric field component at one fixed location for a measurement with N independent samples <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure A.9 \u2013 Normalised PDF of the maximum of an electric field component at a fixed location for a measurement with N independent samples <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure A.10 \u2013 Chamber working volume Figure A.11 \u2013 Typical probe data <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure A.14 \u2013 Distribution of absorbers for loading effects test Figure A.15 \u2013 Magnitude of loading from loading effects test <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Figure A.16 \u2013 Standard deviation data of electric field components for eight probes in the loaded chamber <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex B (normative) \nChamber validation for mode-tuned operation <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Tables \n Table B.1 \u2013 Sampling requirements Table B.2 \u2013 Field uniformity tolerance requirements <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Figure B.1 \u2013 Probe locations for chamber validation <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Annex C (normative) \nChamber validation and testing for mode-stirred operation <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Figure C.1 \u2013 Received power (dBm) as a function of tuner rotation (s) at 500\u00a0MHz Figure C.2 \u2013 Received power (dBm) as a function of tuner rotation (s) at 1\u00a0000\u00a0MHz <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Annex D (normative) \nRadiated immunity tests <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | Figure D.1 \u2013 Example of suitable test facility <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Annex E (normative) \nRadiated emissions measurements <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | Figure E.1 \u2013 Example of suitable test facility <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Figure E.2 \u2013 Relating to the calculation of the geometry factor for radiated emissions <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Annex F (informative) Shielding effectiveness measurements of cable assemblies, cables, connectors, waveguides and \npassive microwave components <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | Annex G (informative) Shielding effectiveness measurements \nof gaskets and materials <\/td>\n<\/tr>\n | ||||||
| 82<\/td>\n | Figure G.1 \u2013 Typical test set-up Figure G.2 \u2013 Typical test fixture installation for gasket and\/or material testing <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | Figure G.3 \u2013 Test fixture configured for validation <\/td>\n<\/tr>\n | ||||||
| 84<\/td>\n | Annex H (informative) \nShielding effectiveness measurements of enclosures <\/td>\n<\/tr>\n | ||||||
| 90<\/td>\n | Figure H.1 \u2013 Typical test enclosure installation for floor mounted enclosure testing Figure H.2 \u2013 Typical test enclosure installation for bench mounted enclosure testing <\/td>\n<\/tr>\n | ||||||
| 91<\/td>\n | Annex I (informative) \nAntenna efficiency measurements <\/td>\n<\/tr>\n | ||||||
| 93<\/td>\n | Annex J (informative) Direct evaluation of reverberation performance using field anisotropy and field inhomogeneity coefficients \n <\/td>\n<\/tr>\n | ||||||
| 98<\/td>\n | Table J.1 \u2013 Typical values for total field anisotropy coefficients for \u2018medium\u2019 and \u2018good\u2019 reverberation quality <\/td>\n<\/tr>\n | ||||||
| 99<\/td>\n | Figure J.1 \u2013 Theoretical and typical measured distributions for field anisotropy coefficients in a well-stirred chamber <\/td>\n<\/tr>\n | ||||||
| 100<\/td>\n | Figure J.2 \u2013 Theoretical and typical measured distributions for field anisotropy coefficients in a poorly stirred chamber <\/td>\n<\/tr>\n | ||||||
| 101<\/td>\n | Figure J.3 \u2013 Typical measured values for field anisotropy coefficients as a function of N in a well-stirred chamber <\/td>\n<\/tr>\n | ||||||
| 102<\/td>\n | Annex K (informative) M \neasurement uncertainty for chamber validation \u2013 Emission and immunity testing <\/td>\n<\/tr>\n | ||||||
| 107<\/td>\n | Figure K.1 \u2013 Average emitted power as a function of frequency for a typical unintentional radiator Figure K.2 \u2013 Estimated standard uncertainty <\/td>\n<\/tr>\n | ||||||
| 108<\/td>\n | Figure K.3 \u2013 Mean normalized width (in dB) of a n% \n-confidence interval Figure K.4 \u2013 Individual mean-normalized interval boundaries (in linear units) for maximum field strength as a function of the number of independent stirrer positions N <\/td>\n<\/tr>\n | ||||||
| 109<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Electromagnetic compatibility (EMC) – Testing and measurement techniques. Reverberation chamber test methods<\/b><\/p>\n |