Siglent SDS2104X Plus FFT - Page 1
Forum section: electronics / testgear

author: andow
author_rank: Newbie
timestamp: May 09, 2022, 08:50:19 pm
content: Hello everybody! I've been lurking this forum for a long time, finally here is my first post!I recently bought a Siglent SDS2104X Plus and am really happy with it so far. One thing that puzzles me however is the display of the FFT (see attachment for an example).- First of all the x-axis is always linear, is there really no way to make it logarithmic?- My main use for the oscilloscope is testing audio equipment. When analyzing the frequency range of 20Hz-20kHz the essential area nearly up to 2kHz is covered by the y-axis scale. Is there a way to change this so the graph starts to the right of the scale?

author: Martin72
author_rank: Super Contributor
timestamp: May 09, 2022, 08:55:02 pm
content: QuoteAFAIK no, maybe they can implement it as a additional feature in a future firmwareupdate.The scaling itself is too much - Nobody needs 4 digits after the comma...IMHO a bug to fix.

author: TheLaSwamp
author_rank: Newbie
timestamp: May 09, 2022, 11:57:50 pm
content: Nice rig! I have the 1104X-U and I love it. It's it a bit lower in the food chain than yours, but I'm really enjoying tinkering with it.

author: bdunham7
author_rank: Super Contributor
timestamp: May 10, 2022, 12:46:56 am
content: You can run two FFTs simultaneously. Here is a 1kHz square wave with FFT1 at 0-20kHz and FFT2 at 0-2kHz. Sort of like a zoom, adjust as needed.

author: 2N3055
author_rank: Super Contributor
timestamp: May 10, 2022, 06:32:22 am
content: You can set to start from -100Hz .... Or any negative value. That will shift FFT curve to the right.Or you can simply pull it to the right with the finger...Or pinch zoom like on a tablet..

author: andow
author_rank: Newbie
timestamp: May 10, 2022, 08:58:08 pm
content: Thanks everybody for the replies! Some good tips here to make it more usable....It would be great if Siglent would come up with an update for this feature. I know they have dedicated spectrum analyzers but I think it's such a waste since this feature is already there in the SDS2000X.Anyway, still more than happy with this oscilloscope! Definitely a big upgrade from my old Philips....

author: Martin72
author_rank: Super Contributor
timestamp: May 10, 2022, 09:14:48 pm
content: Absolutely...Me, I´ve bought a used Neutrik A1 audio analyzer system for audio purposes.Because to judge over a DUT it takes a measure equipment which is definitely or mostly better than the DUT...

author: 2N3055
author_rank: Super Contributor
timestamp: May 10, 2022, 09:58:24 pm
content: Quote from: andow on May 10, 2022, 08:58:08 pmYou do know you have built in frequency response analyser in a scope? That does gain/phase plots and does it with log frequency too...?

author: andow
author_rank: Newbie
timestamp: May 11, 2022, 09:58:05 am
content: Quote from: Martin72 on May 10, 2022, 09:14:48 pmSure, I know that there are better devices for this. We have a Rohde & Schwarz Audio Analyzer in the studio and I also often use my RME interface with REW for this.But for a quick peek it's still nice to have on the oscilloscope.... ;-)Quote from: 2N3055 on May 10, 2022, 09:58:24 pmYes I do ;-) And it's a very cool feature! But it takes time and you can't measure in "real time", so the FFT is good for a quick check.But a Bode plot is really nice to have on the scope, and you don't even need an external function generator! I think this was the feature that sealed the deal for me buying the Siglent.