IEC 61000-4-20

From RadiWiki
Revision as of 20:25, 5 October 2024 by Joro (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

The EN/IEC 61000-4-20 standard describes how Immunity and Emission measurements are performed in a transverse electromagnetic (TEM) waveguides.

The exact title of this standard is: "IEC 61000-4-20: Electromagnetic compatibility (EMC) - Part 4-20: Testing and measurement techniques - Emission and immunity testing in transverse electromagnetic (TEM) waveguides"

This review is based on the Edition 2.0 2010-08 version.

Some random remarks and notes:

  • It is advised to not use EUT that are larger than 1/3 of the height of the usable height of the TEM.
  • For the Immunity testing, the standard describes that the Uniform Field Area in the TEM should be verified, using the procedures similar to as described in the EN 61000-4-3.


Emission[edit]

The TEM cell is a different and cost efficient method, compared to the OATS, to measure the emission patron of the EUT. This method does have a down side, calculation is needed to correlate the measurements done in the TEM cell to the OATS

For the emission tests there are 2 ways to calculate a correlation to the OATS:

  1. multi pole model
  2. three voltage measurements

Multi pole model[edit]

The multi pole model is currently not supported by RadiMation®

Voltage measurements: 3-Positions[edit]

Also known as the "To Radiated Power method". In this method the EUT is placed in 3 axis (x, y and z).

, and are the measurements done in Volt on the same frequency but in different directions.

is the Root-sum-square of the measured voltages.

is the maximum field in V/m

is the geometry factor determined by the height scan of the receiving antenna.

Related standards[edit]

Links[edit]