The ESA1 is a system of EMC tools for the comparative measurement of interference emitted by assemblies and devices. The CS-ESA software, which is designed for the developer’s needs, is included for quick and easy-to-follow interference supression. ESA1 is designed for the developer’s work space. With the ESA1, interference measurements taken during the development stage are proportional to the results from far-field measurements or from measurements with artificial networks. With the ESA1 tools, disturbance sources can be localized, effects detected and suitable EMC measures determined and implemented. The effects of the improvements implemented with ESA 1 are proportional to the results of the far-field measurements.