First, I want to apologize if this isn't in the correct forum. I didn't see anything that really fit, so I put it in this forum as the question is being driven by the output of my atxmega128A3U's clock signal.
My scope is an OLD Textronix TDS544A. Within the last year, I have pulled it apart and replaced all of the electrolytic capacitors in it. And it passes all of the self-tests every single time. When I connect any of the probes up to the probe compensation signal generator (0.5V 1KHz square wave) and look at the output at 1ms time division, I get the expected perfectly square output.
When I connect it to the clock output of my atxmega128A3U (pin E7 in specifically) at say 8MHz, I get a reasonable square wave with ringing on the rising and falling edges. The problem is when I look at the clock when the board is running 32 MHz. The output looks like a sinewave that has swallowed a square wave. No ringing is evident either. I would post a screen shot of the waveform, but that scope is old enough that uses a 3.5" floppy and I don't have one on any of my computers.
I can think of a lot of different things that would cause the signal to look like that, unfortunately, one of them is the acquisition circuit is going out of tolerance. Could I talk someone with a more modern scope to grab a screen capture of the clock out at 32 MHz so I can compare it to my scope? I would really appreciate it!