IEC 61000-4-21

The EN/IEC 61000-4-21 standard describes how Immunity, Emission and other measurements are performed in a reverberation chamber.

The exact title of this standard is: "IEC 61000-4-21: Electromagnetic compatibility (EMC) - Part 4-21: Testing and measurement techniques - Reverberation chamber test methods"

This review is based on the 2011 version.

Some random remarks and notes:

• Before a test a 'quick check' chamber performance measurement should be made to ensure that the loading of the chamber is less than the original chamber validation.
• ...

The field within the chamber is considered uniform if the standard deviation is lower than a predefined value.

Frequency range	below 100 MHz	100 - 400 MHz	above 400 MHz
Accepted standard deviation	4 dB	3 dB increasing linearly to 4 dB	3 dB

The specific measurements are described in several Annexes:

• Annex A: Reverberation chamber overview
• Annex B: Chamber validation for mode-tuned operation
• Annex C: Chamber validation and testing for mode-stirred operation
• Annex D: Radiated immunity tests
• Annex E: Radiated emission measurements
• Annex F: Shielding effectiveness measurements of cable assemblies, cables, connectors, waveguides and passive microwave components
• Annex G: Shielding effectiveness measurements of gaskets and materials
• Annex H: Shielding effectiveness measurements of enclosures
• Annex I: Antenna efficiency measurements
• Annex J: Direct evaluation of reverberation performance using field anisotropy and field inhomogeneity coefficients
• Annex K: Measurement uncertainty for chamber validation - Emission and immunity testing

Links

• IEC 61000-4-21

Institute of Electrical and Electronics Engineers

ElectroMagnetic Compatibility

Decibel

The ability of an EUT to be immune to incoming electromagnetic interference. This is equivalent to the term susceptibility that is used by some standards.