A line impedance stabilization network (LISN) device is something engineers use to test radiofrequency (RF) emission and susceptibility. During an electronic equipment test, engineers place the LISN device between an alternating current or direct current power source and the equipment under test. Then, the LISN creates known impedance and provides RF noise measurement. The user can then isolate the unwanted RF signal from the power source. Shop used and refurbished LISN devices for higher return on investment.
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