Products > Test Equipment
SDS800x HD vs DHO800x FFT
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cyo3fff:
Hello,

I had a DHO804 scope and I give it away thinking to replace it with something "better".
SDS824x HD seems to be the right choice but I have at least one question not answered.
It is about FFT refresh rate.
On DHO804, the FFT refresh rate was "real time" updated like a real time spectrum analyzer for at least 100MHz span with narrow RBW (1kHz or less).
Up to know I did not found a youtube or something similar to show the refresh rate of the SDS800x FFT.
Could someone having both scopes to do a demo on this topic please? Or one with SDS824x HD at least because I know what DHO804 is capable of.

Thank you.

BR,

Cristian
Martin72:
Hi and welcome to the forum.


--- Quote ---It is about FFT refresh rate.
--- End quote ---

And how is this measured or is it more of a belly feeling:

--- Quote ---On DHO804, the FFT refresh rate was "real time" updated like a real time spectrum analyzer for at least 100MHz span with narrow RBW (1kHz or less).
--- End quote ---

You can also get the DHO800 to "stand still" at FFT, believe me. ;)
As always, this depends on the settings, no matter which scope you have.
That's why I don't think the question can be answered in general terms; you can rather "pick out" a specific situation and then compare it - with a sense of proportion....
cyo3fff:
Hi Martin72,

Thank you for welcoming me.

"And how is this measured or is it more of a belly feeling:"

Is more of a "feeling".

A test case would be:

FFT on an arbitrary signal (could be a wire as an antenna close to a dc-dc convertor or from a wave generator) with the following parameters:

start/stop frequency: 1MHz/200MHz
RBW: 10kHz (or 1kHz)
Max sample rate and number of points available for the kind of measurements
Windowing: Flattop (or else)
----------

But I prefer to see a movie not a still picture or, mathematically, how many frames/seconds the scope could achieved on this test case.
To "pass" the test (on my "feeling" criteria), the scope should have at least 30fps (just to give a "real time feeling" - like in a movie with 30fps or better).

Could you do this for me Martin72 please? It will help me a lot.

Thank you.

BR,
Cristian
TomKatt:
If you gave away a DHO804 because you wanted something better, I'd be thinking you're aiming higher than an SDS824X HD...  This Siglent is a good scope (I have one myself), but this seems like a lot of fuss to basically just change team brands.  If FFT is that important and the DHO804 wasn't good enough, perhaps you ought to be aiming higher?
Martin72:

--- Quote ---Could you do this for me Martin72 please? It will help me a lot.
--- End quote ---
I no longer have an SDS800X HD.


--- Quote ---If FFT is that important and the DHO804 wasn't good enough, perhaps you ought to be aiming higher?
--- End quote ---
The FFT function in particular is something that has been solved much better in the SDS800X HD than in the DHO800.
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