Since the devastating effect of EMP on electronics in the military field has been known for a long time, all military systems are equipped with efficient protection against the impact of EMP. However, EMP is equally dangerous for all civil electronics used in almost every section of today's most important infrastructure of any country, for instance the power industry. These days, the protection of power system electronics against EMP that is capable of disturbing its normal operation or even to completely disable it, becomes extremely important. This article explains special aspects related to testing power system electronics resilience to HEMP and discusses the selection of a proper target, methods, and test pulse parameters.