Nothing to do ?
use a shieded cable for carring out the signal far away to oscilloscope ?
If you want to shield it for the other devices, a Faraday cage may help.
If you simply want to see less noise, you can try the following:
- Use a direct, short BNC connection to the DUT whenever possible.
- If you use the probes, use the 1x mode (for the smallest signals anyway).
The less stuff hanging on the probe (sprung hook, alligator clip) the less “antenna” you have.
- Turn on the bandwidth limiter (BW 20M).
- If it does not trigger cleanly, a trigger holdoff can help (perhaps via PC).
- For repetitive signals, the "Average" acq. mode can help (or a little less the HR mode, for any signal type).
Noise is everywhere. Maybe it's not just coming from the scope?
I don't think the noise is that bad if you help a little.
In the attached image you can see a measurement with
- Probe (1x), sprung hook and alligator clip (i.e. completely normal).
- BW limitation on
- Average Acq. (8x).
This is a very small signal for a measurement with the probes (6.5mVpp) and it still looks reasonable to me.