I put the probe into a +5v circuit before a LED inside an Arduino breadboard (and checked with a multimeter +5v was on that circuit).
However, whatever knobs I turn or switches on the oscilloscope I set, the horizontal line always stays in the middle (except when I change the position knob on the bottom left).
It's my first-ever oscilloscope ... what switch/knob should I set to get a reading of +5v ... or is the oscilloscope broken?
@Update: It works now (sort of). I noticed there was a multiplication of 10 switch on the probe itself (so the difference between 0 and +5v was not visible), and had to change the main amplitude knob and the inner knob (whatever it means) and also the 0 X B Bal knob ...
But the most important is, that it works, now I have to learn what all knobs mean :-)
I made a new question, since I got some major problems using it: Oscilloscope makes my mains (fuse box) group go down (maybe problem solved)