Products > Test Equipment
How much noise floor and other things matter in oscilloscope usability
<< < (32/63) > >>
bdunham7:

--- Quote from: Fiorenzo on December 28, 2021, 10:13:42 pm ---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.

--- End quote ---

Could you try the ripple and maybe no probe (like the first photos) with the Siglent in the 10-bit acquisition mode?
Fiorenzo:

--- 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.  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.

--- End quote ---


Yes I have put the wire of the probe in the less noisy position
Fiorenzo:

--- Quote from: Fungus on December 28, 2021, 11:11:03 pm ---
--- 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.

--- End quote ---

I know but i put the probes in the same manner with the lowest noise captured, i also did the photos with avarage on the signal of the ripple i didn't had the time to upload
Fiorenzo:

--- Quote from: bdunham7 on December 29, 2021, 04:05:33 am ---
--- Quote from: Fiorenzo on December 28, 2021, 10:13:42 pm ---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.

--- End quote ---

Could you try the ripple and maybe no probe (like the first photos) with the Siglent in the 10-bit acquisition mode?

--- End quote ---

Yes i will do. The 10 bit more reduce the noise as i checked yesterday evening. I will post some photos.
In regard of the Rigol It Is in my opinion a very good scope but It has the problem of the noisy front end
Fiorenzo:

--- Quote from: Fungus on December 28, 2021, 11:14:05 pm ---
--- Quote from: Fiorenzo on December 28, 2021, 10:08:00 pm ---Ripple same settings on both oscilloscope
AC, normal mode, 1x probe

--- End quote ---

I disagree that there's a huge difference in useful information. Sure, the Siglent line is thinner but The Rigol is showing the ripple just fine.

You should also be able to change the displayed part of the signal (the red bit) by twisting the selection knob on the Rigol (ie. intensity setting).

And again: What does averaging mode do if you turn it on in this situation? Why is this being avoided?





--- End quote ---

The spikes you can clearly see in the Siglent i think are switching noise  coming from the next stage of this psu. I am going to do some test about It to check if the front end noise of the Rigol is covering such interference
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod