Verification of a Low-Cost Electromagnetic Field (EMF) Tester for Electromagnetic Compatibility (EMC) Investigations

Abstract Electromagnetic compatibility (EMC) issues are increasingly prevalent in modern electronic devices. One contributing factor is the ongoing pressure to reduce production costs, which can lead to design compromises that negatively impact EMC performance. EMC measurements are often complex and typically require specialised facilities and instrumentation, such as anechoic chambers and spectrum analysers, to ensure accurate assessments. In this study, low-cost, handheld electromagnetic field (EMF) testers are presented as valuable tools for preliminary electromagnetic interference (EMI) investigations. Measurements indicate that these simple testers can serve as effective initial instruments for EMC assessments. However, accurate interpretation of measurement results is crucial. Adherence to general usage guidelines is essential, as misinterpretation may lead to an overestimation of EMC issues. For comprehensive analysis, particularly in identifying complex interference sources, more sophisticated measurement instrumentation remains necessary, such as a spectrum analyser and various types of antennas.