Yeah that's exactly what I've done.

I wrote also an email to you with the same result so i'll return it to the store i got it from (Conrad.at).

The bad thing is that it was a Birthday present and i got it on sunday and the two weeks are by far over....

Hello, I plgugged in my Sensing head: TT-LF 212 10:1 - 1,2m Attenuation Ratio: x10 Input Impedance: 10 MΩ, 14 pF Bandwidth: 150 MHz Rise Time: 2,3 ns Cable Length: 1,2 m Compensation Range: 10..60 pF in Channel A. Then I plugged it in the Signal Out Channel. Bellow is the image what i got. Is this ...

So do you have no idea?

I'm expecting to see a Flat Line at 0V