| Products > Test Equipment |
| How much noise floor and other things matter in oscilloscope usability |
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| Fiorenzo:
Ripple same settings on both oscilloscope AC, normal mode, 1x probe |
| Fiorenzo:
There is a huge difference between this two scopes. The Rigol has a faster update of the image, almost double... and the quality of the rappresentation, i mean the graphics, of the signal is a lot better than the Siglent. It seem like the Siglent had a lower resolution. There is not a huge difference in the speed of the user interface and also the Rigol appear to have a better quality of the material of the scope. But the front end noise is a lot different. Judge by your self from the photos attached. |
| David Hess:
--- Quote from: Fiorenzo on December 28, 2021, 10:06:46 pm ---Normal mode Probe connected 1x and grounded --- End quote --- Shorting the probe tip can be tricky. For lowest noise it is not sufficient to simply clip the probe's ground lead to the probe's tip because the loop will pick up ambient noise. Best is to short the tip out with a coaxial probe tip to BNC adapter plugged into a BNC short or 50 ohm termination, but winding wire around the probe tip also works. |
| nctnico:
This is even worse than I expected ( :wtf: ). I don't care about the open / shorted inputs at the most sensitive V/div (Rigol does digital zoom there so it is not an apples for apples comparison) but I do care about the display of an actual signal. On the Siglent you can clearly see spikes on the signal which are completely obscured on the Rigol. |
| Fungus:
--- Quote from: Fiorenzo on December 28, 2021, 09:57:59 pm ---So i did a lot of photos. First two comparison: no probe, 1mv/div, 20mhz BW limit. --- End quote --- Irrelevant. Only real signals count. --- Quote from: Fiorenzo on December 28, 2021, 10:03:35 pm ---4x avarage no probe --- End quote --- Averaging only works when there's a periodic signal. --- Quote from: Fiorenzo on December 28, 2021, 10:08:00 pm ---Ripple same settings on both oscilloscope AC, normal mode, 1x probe --- End quote --- No averaging? That's the only thing that counts - if averaging mode can better show the underlying signal or not. --- Quote from: David Hess on December 28, 2021, 10:15:02 pm --- --- Quote from: Fiorenzo on December 28, 2021, 10:06:46 pm ---Normal mode Probe connected 1x and grounded --- End quote --- Shorting the probe tip can be tricky. For lowest noise it is not sufficient to simply clip the probe's ground lead to the probe's tip because the loop will pick up ambient noise. --- End quote --- Yep. Connecting the ground clip to the probe actually creates an antenna. |
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