IEC 61000-4-20: Difference between revisions

Latest revision as of 20:25, 5 October 2024

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:

multi pole model
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).

$S={\sqrt {V_{x}^{2}+V_{y}^{2}+V_{z}^{2}}}$

$V_{x}$ , $V_{y}$ and $V_{z}$ are the measurements done in Volt on the same frequency but in different directions.

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

$E_{max}=G_{max}*{\sqrt {{\frac {3\eta _{0}}{4\pi }}P_{0}}}$

$E_{max}$ is the maximum field in V/m

$\eta _{0}={\sqrt {\frac {\mu _{0}}{\epsilon _{0}}}}=120\pi \Omega =377\Omega$

$G_{max}$ is the geometry factor determined by the height scan of the receiving antenna.

Related standards[edit]

EN 61000-4-3

Links[edit]

IEC 61000-4-20

@@ Line 1: / Line 1: @@
+__NOTOC__
 The [[EN]]/[[IEC]] 61000-4-20 standard describes how [[Immunity]] and [[Emission]] measurements are performed in a transverse electromagnetic (TEM) waveguides.
@@ Line 11: / Line 12: @@
 * 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 ==
+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:
+# multi pole model
+# three voltage measurements
+=== Multi pole model ===
+The multi pole model is currently not supported by {{RadiMation}}
+=== Voltage measurements: 3-Positions ===
+Also known as the "To Radiated Power method". In this method the EUT is placed in 3 axis (x, y and z).
+<math>S=\sqrt{ V_{x}^2 + V_{y}^2 + V_{z}^2  }</math>
+<math>V_{x}</math>, <math>V_{y}</math> and <math>V_{z}</math> are the measurements done in Volt on the same frequency but in different directions.
+<math>S</math> is the Root-sum-square of the measured voltages.
+<math>E_{max}=G_{max} * \sqrt{ \frac{3\eta_0}{4\pi} P_0 } </math>
+<math>E_{max}</math> is the maximum field in V/m
+<math>\eta_0=\sqrt{ \frac{\mu_0}{\epsilon_0} } =  120\pi\Omega = 377 \Omega</math>
+<math>G_{max}</math> is the geometry factor determined by the height scan of the receiving antenna.
 == Related standards ==
-* [[IEC 61000-4-3]]
+* [[EN 61000-4-3]]
 == Links ==