Hi! I have some doubts about this and rather ask before i do anything that is potentially dangerous to me or my equipments.
Is it safe to ie. measure phone charger output with usb scope? I've read many discussions/articles about measuring mains with usb scope and how it is potentially dangerous, but did not find an answer if it's fine to measure the low voltage side of such devices without issues.
If it makes any difference i have "active" USB hub which is powered with external source from mains and not directly from USB port of PC.