End of line testers, whether they are ICT or functional (FKT), require the use of solid-state relays (SSR) for creating paths for applying the correct stimulus into the device under test (DUT) pins. This fact makes Relay Boards one of the most critical parts of the system due to several considerations: reliability, simplicity, and cost. Lynx Tester has a small but sufficient set of Switch Matrix Relay Boards, each designed for a specific purpose: DUT power supply, 4-wire measurements, ICT, GPIO or the supervision of the injected signal.