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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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