![]() The purpose of the LISN is to standardize the test environment for EMI testing. A spectrum analyzer standard input impedance is 50 ohms, so the voltage across that 50 ohms will be the voltage that is going to be evaluated in frequency domain to see where the equipment under test is meeting standards or not. At the output port, we connect a spectrum analyzer to investigate the frequency domain characteristics of the noise generated. ![]() So most of the AC noise, generated by the equipment under test, is diverted to the output port of the LISN. #Emi Filter Design Software seriesYou can see that any AC current that is going into the equipment under test, would mostly be close through this capacitive coupling to the output port of the LISN, whereas only a little bit of current would be flowing through the series inductance. On the left-hand side, a LISN is connected to a power source, on the right-hand side, it's connected to the equipment under test, and in between, LISN operates as a filter. Let's look at the LISN first, what is shown here is one-half of a complete LISN. We'll talk about differential-mode and common-mode EMI, and we will illustrate the discussion using a simulation example based on a boost DC-DC converter. In this lecture, we will look into more details related to measurement of conducted electromagnetic interference, and the use of the line impedance stabilization network or LISN.
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