I have observed that if I plug it in directly without the alligator cable that comes with the oscilloscope, the peaks on the sides of the signal improve, but I do not get a clean signal like yours.
Yes, the noise and all that doesn't originate in the scope, it's from the cable or the probe.
You can minimize all that with a short/better cable.
In the attachment you see the short coax from the TinySA or NanoVNA and a 50Ohms LR.
You can measure signals below 1mVpp cleanly this way (second picture, the resolution starts to show, but not so much the noise).
With a probe, you probably pick up most of the noise from the
screen. Stay away from it.
The scope does not "invent" the noise. If it's there, it shows it.
However, it has no “intensity grading” like newer Rigols.
So:
- Take the cable away from sources of interference
- Turn on the 20M bandwidth limitation if possible.
- With Acquire Mode “Average” repeating signals may also appear more stable.
- In 1x mode of the probe you will have less noise.
- If the noise is so bad that it cannot trigger stably, you can adjust the holdoff of the trigger for periodic signals.
This is best done via SCPI, as it is sometimes not possible to make fine adjustments with the rotary knob (bug).
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