Design of Radio-Frequency Electromagnetic Field Radiated Immunity Automatic Test System in GTEM Cell Based on Labview

Abstract

Radio frequency electromagnetic field radi-ated immunity test is an important part of EMC (Electromagnetic Compatibility) test, which is usually tested in anechoic chamber to evaluate the immunity of the equipment to radio-frequency electromagnetic radiation. The construction of anechoic chamber and the system in-tegration almost cost millions or even tens of millions of yuan. Additionally, the test in chamber is inefficient be-cause the signal generator outputs slowly in order to avoid damage to high power equipments. For the users who just need the test of small products and equipment parts, the system of chamber is cost-ineffective. To solve the problem, the author designs a test system. The hardware of the sys-tem is based on GTEM (Gigahertz Transverse Electromagnetic) cell, equipped with suitable signal gen-erator, power amplifier, field strength probe etc. The software of the system is based on Labview automatic test program, which can realize the functions of instrument control, PID (Proportion, Integral, Differential) automatic adjustment, automatic test etc. The test results of the system meet the requirements of relevant standards. The system cost can be controlled in less than one million yuan. And the system without high power equipments is high efficiency and has low site requirements, which meets us-er's small products test demand.