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A line impedance stabilization network is a device used in conducted and radiated radio-frequency emission and susceptibility tests, as specified in various electromagnetic compatibility /EMI test standards.
A LISN is a low-pass filter typically placed between an AC or DC power source and the EUT to create a known impedance and to provide a radio frequency noise measurement port. It also isolates the unwanted RF signals from the power source. In addition, LISNs can be used to predict conducted emission for diagnostic and pre-compliance testing.
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