IEC/EN 61000-4-6 specifies the design and performance of a range of coupling/decoupling networks (CDNs). Each CDN is specific to the type of cable and the intended signal carried on the cable. The CDN M series is used to inject the RF disturbance on the main line (supply). Teseq offers a solution for two line and three line that can be configured using switch. The presented CDN M0 has a maximum current of 16 A and operating frequency starts from 150 kHz to 230 MHz. Teseq CDN M0 complies fully with the requirements of the standard and provide a simple, reliable and safe method of injecting RF energy into the equipment under test (EUT).