Now you can SEE high frequency electromagnetic fields. There are high demands for electromagnetic compatibility (EMC) of electronic products. The demands are stated in different set of rules, for example: VCCI, ANSI,CISPR, FCC and VDE. These demands are specified for products or systems and not for components or elements. The fact that there is no easy way to find the exact location of a radiating source is a problem for designers today. Detectus AB has developed several measuring systems with which the designers can measure the intensity and the location of a radiation source at a component level. The results of such a measurement can be shown as two or three dimensional coloured maps.