IEC 61000-4-21

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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



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