| Products > Test Equipment |
| SDS800x HD vs DHO800x FFT |
| (1/8) > >> |
| 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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