Many critical infrastructures are heavily dependent on the reliable functioning of electronic systems. These include communication networks, hospitals or power grids. High Power Electromagnetics (HPEM) is a technology that can be used to generate strong electromagnetic fields which can be used as a weapon to deliberately disrupt the regular operation of electronic systems. A German research institute has developed a robust receiving and measuring apparatus in order to detect otherwise unnoticed exposure to extreme interference signals. The institute is a leading partner of the industry, military and civil public sector. It is part of a world-renowned German research organization for applied research and development services and has extensive experience in European research framework programs (Horizon). The system developed is comprehensive and capable of measuring and recording signals. Findings can then be used as a basis for rapid countermeasures. The technology developed is able to detect the interference frequency, to improve field strength determination and direction detection, based on frequency information. Central pulse parameters and measured and displayed. The system includes both hardware and software. System components include spiral antennas for detecting electromagnetic signals with high field strength, attenuators to weaken the signals and a unit to process, digitize and temporarily store the signals. The frequency as well as key pulse parameters (pulse width, pulse number, etc.) can be determined. The data is evaluated on a built-in microcomputer. Data is controlled and displayed on a web interface. The system is built into a well-shielded housing and includes a built-in battery for mobile operation. The system can be used for a frequency range from 500 MHz to 6 GHz. It allows for a field strength measurement from 100 V/m up to several kV/m. The system is shielded against even higher field strengths. Battery operation is possible up to 8 hours.