Effects of Environmental Phenomena on EMC Measurements

Dávid Maklári, Tamás Bodolai

Abstract

The EMC (Electromagnetic Compatibility) is one of the most important sectors in electronic industrial and in retail area as well. As more devices and “gadgets” are connected to network via wireless communication as more challenging to avoid any malfunctioning during normal operation. The main focus is to determine how much noise come from our devices and how much they can be immune to noises before causing any problem in their normal operation. Because this high sensitivity, reaction and interaction of the environmental factors - building - EMC chamber – measurement equipment and UUT (unit under test) as a whole system should be deeply understood and analyzed. One of the most important such problems is the earthing of the chamber and the building. As a requirement of Albatross Projects GmbH (manufactureer of University of Miskolc EMC chamber), the chamber needs an earthing point with less than 1 Ohm. As well-known as less the grounding resistance as better the performance. But the question is how the effect of the grounding resistance can be determined and calculated. The difference between 1.1 Ohm and 0.9 Ohm matters in the practice. In many cases EMC chambers are installed into an existing building where this 1 ohm can be hardly achieved therefore relation between resistance value and the measurement performance should be determined.

Keywords

EMC; earthing resistance; environmental effect

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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