Conducted Emissions Test Equipment

Conducted RF emissions is electromagnetic energy created by an electronic device of which a portion conducts onto the power supply cord and into the AC power grid. This energy can then affect other nearby electronic devices connected to the same power grid. During conducted emissions tests, the emissions created by the equipment under test (EUT) are measured to make sure they fall below specified standard limits. The most common frequency range for conducted emissions testing is 150 kHz – 30 MHz, however this range can be lower or higher for specific standards.


The test setup consists of the EUT, EMI Receiver or Spectrum Analyzer, Line Impedance Stabilization Network (LISN) and Transient Limiter. The EUT is connected to the LISN which provides a well defined impedance to the EUT, filters unwanted disturbances coming from the mains supply and protects the mains supply from unwanted disturbances created by the EUT. The RF port of the LISN then connects directly to the EMI receiver with a transient limiter in series to protect the receiver input from voltage spikes.

An innovative solution exists which combines the EMI Receiver, LISN, Transient Limiter and Control Software into one compact product. Click on the below link to learn more about this equipment:

EMSCOPE Solution



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