You see, the power supplied to the DUT must be clean in order to measure nothing but the noise the DUT delivers, without it including the power line's noise as well. We also use a LISN to isolate the power mains from the device in this test (DUT). For this purpose, we use a Rigol DSA815-TG Spectrum Analyzer (9kHz -1.5GHz) with the EMI option. You need an EMI receiver to properly measure the EMI a device emits, a Spectrum Analyzer with some specific features that are pre-defined by the CISPR 16-1-1 specification. Electromagnetic Immunity (EMS) is the tolerance to electromagnetic emissions. Electromagnetic Interference (EMI) stands for the electromagnetic energy a device emits, and it can cause problems in other close-by devices if too high. EMC at a GlanceElectromagnetic Compatibility (EMC) is the ability of a device to operate properly in its environment without disrupting the proper operation of other close-by devices.
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