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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by KungFuJosh on Today at 10:55:51 pm »I meant I get a clean sine wave up to 841MHz.Ah, I see. Well, that's just one point in time, and the display persistence hides the deviation of the peaks from the real value. What we're interested in is observing dynamically how the waveform becomes wobbly as the signal frequency increases and gets closer to that point.
It's clearly better than the Rigol, though, which is much worse at 1/2.5x the sampling rate. I wonder how the SDS800X HD scopes perform in this scenario.
Here's, BTW, a 500 MHz sine wave captured at 1.25 GSa/s sampling rate:
I didn't get any wobble within normal range, and then I still don't get anything as crazy as what you showed in your screenshot. It mostly shrinks and the counter gets farther and farther off. Near the end before it resets, it looks a little wonkier.
Let me know if you want different parameters than what I've got here:
TSA Ultra set at 800MHz with a 10s 500MHz sweep.