Difference between revisions of "61000-4-20"
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<math>E_{max}=G_{max} * \sqrt{ \frac{3\eta_0}{4\pi} P_0 } </math> | <math>E_{max}=G_{max} * \sqrt{ \frac{3\eta_0}{4\pi} P_0 } </math> | ||
− | <math>E_{max}</math> in V/m | + | <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>\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. | ||
=== Example calculation === | === Example calculation === | ||
= Immunity = | = Immunity = |
Revision as of 12:40, 22 January 2009
The 61000-4-20 is the standard for the Tem cells
Contents
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 there are 2 ways of calculation:
- multi pole model
- three voltage measurements
With the correlation the assumption is that under far field conditions the emitted power
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,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.