I was making an amplifier circuit, and found it was oscillating at really low freq, down around 1Hz. My hacked sdg2042x was set to 800kHz. And then after playing around I noticed it is the AWG all on it's own doing it. I never noticed this before.
Looking at the AWG alone with 1Vpp
100kHz 1.24Vpp and 0.42Vrms ~0.05Hz (w/ scope on ~5sec/div)
1MHz about the same voltage, about 0.5Hz
Zooming in on the 1MHz signal, I see it's 1.25Vpp, 0.44Vrms
So without trying my analog scope, am I just seeing a frame rate effect, like when a spinning tire looks stopped ?? Or is it actually a real oscillation, maybe from ADC/DAC low freq noise??
I swear I never noticed it like this before, when using the AWG and the same scope together.
Your 1st image.
Have you ever noticed that producing some types of humor is not quite easy.
(I can not believe you do not know basic fundamentals, so I first reaction is: this is some kind of humor)
Also I can try humor. Problem is between chair and oscilloscope.
Playing like kid, independent of true age, without full understanding is, of course, a fun pastime.
But seriously. I'll give you a hint. The AD converter can also be used for frequency conversions. Sure, I could say more clearly, but then you wouldn’t start learning the basics of a digital oscilloscope.
But then if this is real seriously made msg...
Look your first image right top corner two numbers... 99.9999kHz and Sa 50kSa/s
Your signal is seriously undersampled. fNyquist with 50kSa/s is 25kHz and you try look 100kHz signal...
welcome to world of digital oscilloscopes. You are not first one.