Hi @attila
In my case one of the AD2 boards is connected to a DUT (Device Under Test) and the DUT is powered via a separate bench top power supply. Also, the AD2 board is connected to a test server PC via USB cable and it has a separate external power supply connected to 5V DC input. Obviously, the test server PC, the bench top power supply and the AD2 power supply are powered from different power sockets under my desk (with a proper grounding I believe) and obviously the AD2 board's ground is connected to the DUT's ground. Correct me if I'm wrong, but I believe this should be a fairly common scenario for any measurement device like an oscilloscope or waveform generator. Could you please let me know if my setup can cause high current to pass the ground line toward the computer and damage an AD2 board? Thanks.