Products > Test Equipment
Siglent SDS800X HD Review & Demonstration Thread
Bill3745:
--- Quote from: 2N3055 on December 07, 2024, 07:58:11 pm ---
--- Quote from: Bill3745 on December 07, 2024, 06:57:18 pm ---Apologies if this is an obvious question that was addressed elsewhere, but what setup did you use for the bandwidth measurements? The closest I can do to approximate the FFT displays you presented was to feed a broadband noise signal into the scope and then run an FFT with averaging. I'm not questioning the bandwidth figures (I pretty much had similar results), but am stymied on how you produced them.
--- End quote ---
Most of the settings are visible in images posted.
Use peak hold mode for FFT and sweep frequency by signal generator.
--- End quote ---
Thanks, peak hold on the FFT answers my question as to how the graph was so smooth without averaging. However, how do you synchronize the generator frequency sweep with the FFT sweep? To me that implies something like a tracking generator on a SA, but not sure how you would duplicate on the SDS800X without some additional equipment.
Bill3745:
--- Quote from: Bill3745 on December 07, 2024, 08:11:17 pm ---
--- Quote from: 2N3055 on December 07, 2024, 07:58:11 pm ---
--- Quote from: Bill3745 on December 07, 2024, 06:57:18 pm ---Apologies if this is an obvious question that was addressed elsewhere, but what setup did you use for the bandwidth measurements? The closest I can do to approximate the FFT displays you presented was to feed a broadband noise signal into the scope and then run an FFT with averaging. I'm not questioning the bandwidth figures (I pretty much had similar results), but am stymied on how you produced them.
--- End quote ---
Most of the settings are visible in images posted.
Use peak hold mode for FFT and sweep frequency by signal generator.
--- End quote ---
Thanks, peak hold on the FFT answers my question as to how the graph was so smooth without averaging. However, how do you synchronize the generator frequency sweep with the FFT sweep? To me that implies something like a tracking generator on a SA, but not sure how you would duplicate on the SDS800X without some additional equipment.
--- End quote ---
Scratch that. I'm guessing (can't test it right now) that the answer lies in the peak hold... Thanks.
gf:
--- Quote from: Bill3745 on December 07, 2024, 08:11:17 pm ---
--- Quote from: 2N3055 on December 07, 2024, 07:58:11 pm ---
--- Quote from: Bill3745 on December 07, 2024, 06:57:18 pm ---Apologies if this is an obvious question that was addressed elsewhere, but what setup did you use for the bandwidth measurements? The closest I can do to approximate the FFT displays you presented was to feed a broadband noise signal into the scope and then run an FFT with averaging. I'm not questioning the bandwidth figures (I pretty much had similar results), but am stymied on how you produced them.
--- End quote ---
Most of the settings are visible in images posted.
Use peak hold mode for FFT and sweep frequency by signal generator.
--- End quote ---
Thanks, peak hold on the FFT answers my question as to how the graph was so smooth without averaging. However, how do you synchronize the generator frequency sweep with the FFT sweep?
--- End quote ---
You don't synchronise. You let the generator sweep very slowly so that the scope captures a large number of records during the sweep and combines them with peak hold. Don't use a too long record length (and number of FFT points) for this use case.
Martin72:
I use these settings when I want to determine the bandwidth using sweep and fft peakhold:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg5208711/#msg5208711
Bill3745:
--- Quote from: Martin72 on December 07, 2024, 09:01:06 pm ---I use these settings when I want to determine the bandwidth using sweep and fft peakhold:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg5208711/#msg5208711
--- End quote ---
Thanks, Martin (& gf). I ended up with the same setup after thinking a bit more about how max-hold operates :palm:
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