Predicting EMI Emission Levels Using EMSCAN

Today, prediction of the emission levels for new products is more important than ever. Reducing the time-to-market requires the design cycle to be shortened, and allows no extra time for trial-anderror approaches to EMI design.

The EMSCAN is a device that measures the RF currents existing on a functioning PC board. This measurement provides a spatial representation of the RF current levels across the entire PC board by measuring the near-field magnetic fields using an array of loop probes. The EMSCAN data is useful to predict the approximate radiated electric field levels from the (unshielded) PC board itself. This information can help product designers to decide between design trade-off options without more expensive and time consuming Open Area Test Site (OATS) testing.