Grounding Effect on LISN for Conducted Emissions Measurement

Abstract

 The increasing use of electronic devices needs to ensure the level of security so that consumers are
protected. The electronic device used emits electromagnetic waves. EMC testing is intended so that the
effects of EMC can be controlled by radiation and its harmful exposures. Line Impedance Stabilization
Network (LISN) is a device used for emission testing in electromagnetic compatibility (EMC) testing. The
many types of LISN in the EMC test with various forms of chassis ground, this research was conducted to
determine the effect of grounding on two different LISN, namely the load and no load conditions. Then
compare the conditions without grounding on LISN. The loads used are television and PC monitors as
Equipment Under Test (EUT), while the measurement without load is called the Noise Floor
measurement. The test method used refers to CISPR 13: 2009. Grounding reduces emission problems in
measurements caused by poor voltage or non-standard quality of components so as to stabilize the
emission values during the conducted emission measurements. Measurement of noise floor with the
grounding system on the LISN which has a metal enclosure and strap produces a voltage level value that
is smaller than the grounding system without metal and strap, which is about 1.7 dBuV for EUT
Television and 1.2 dBuV for EUT Monitor PC.