I have not used my Nano for 2 days. It remained in its cases and this morning I wanted to make a demonstration of my DSO Nano V2 with a friend. By connecting the generator and the probe (I did not connect the mass together like BenF says it) to visualize the square waves, here now what I have
I reloaded it and that does not change anything. What occurs? The remainder functions correctly. If I connect the generator with high speakers, I hear the sound of the frequencies when I pass from one frequency to the other. But as you can see on the image, there is a problem.
I hope that it is not already broken!