I have a new Tenma 72-763572-7635 scope(1 week Everything working fine until this afternoon
The scope now seems to be stuck in AC coupling input mode, even though the display shows DC coupling.
(the relay click when you turn the input scale, also occurs at irregular scale settings....)
It seems either to have a bug (Ive tried repower & system reset) or broken
Any tricks, or should I prepare to send it back?