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Hantek dso2d15 Noise from internal power supply

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iw2evk:
Hi,

somone have tried to modify internal circuit of dso2d15 for reduce the radiofrequency noise irradiated from scope?
I've placed a ferrite sleve on main cord but it's not sufficent for reduce noise.
All around the scope for about 1mt i've strong radio noise on wide spectrum frequencies.

need help , please

Roberto iw2evk

Aldo22:
I think it's the screen, not the power supply.

iw2evk:
Nothing to do ?
use a shieded cable for carring out the signal far away to oscilloscope ?

Aldo22:

--- Quote from: iw2evk on September 24, 2024, 06:19:59 am ---Nothing to do ?
use a shieded cable for carring out the signal far away to oscilloscope ?

--- End quote ---

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.

Aldo22:
And before you curse the DSO2000:
It has pretty good sensitivity for such a cheap scope.
With a FNIRSI 1014D or 1013D you would see as much as in the attached picture of the signal above (50mV/div).
In this case the noise is not an issue.  :-DD

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