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Testing risetime and bandwidth with a Siglent SDS2102X Plus

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Martin72:

--- Quote ---You still need a 500MHz sinusoidal signal source with very good amplitude flatness...
--- End quote ---

OK, I plead guilty.... ;)
I brought this into play because I would like to measure the bandwidth of my scope this way and I now have a good source for it.

gf:

--- Quote from: Martin72 on September 20, 2023, 05:33:42 pm ---
--- Quote ---(significantly shorter than 1ns)
--- End quote ---
In some thread someone had determined the bandwidth of a SDS2000X plus by frequency sweep and FFT, FFT mode was peak if I remember correctly. I just do not know where that was and how it works exactly.

--- End quote ---

I found the message with the explanation again:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg5006257/#msg5006257

tggzzz:

--- Quote from: BrokenYugo on September 20, 2023, 06:50:40 pm --- A good fast edge pulse source is fairly easy to build, fun day project, usually looks like a really fast logic gate slowly oscillating, or a relaxation oscillator based around avalanching a BJT. Many threads on this topic, but start with appendix B of AN72.

http://cds.linear.com/docs/en/application-note/an72f.pdf

--- End quote ---

Pulse generators are fine after you have characterised the pulse's amplitude with a faster scope. What you see on the display is the convolution of the input signal with the scope's response.

IMNSHO it is preferable to use a step generator, since

* they directly reflect a normal use case, the shape of a "digital" waveform
* are easier to build so they are "right by design"
* require less characterisationLeo Bodnar's is one such, but even modern jellybean 74LVC1G* gates can be persuaded to give 2.5V 250ps into 50ohms; see https://www.eevblog.com/forum/testgear/show-us-your-square-wave/msg1902941/#msg1902941 . Naturally great care has to be given to layout and decoupling - don't even think of using solderless breadboards, but manhattan might be OK for scopes up to a few hundred MHz.

tautech:

--- Quote from: Yellie on September 19, 2023, 03:49:03 pm ---I received a Siglent SDS2102X Plus scope a few days ago and wanted to the test the specs.

--- End quote ---
Why ?
Risetime is stated in the datasheet at 3.5ns on P10:
https://int.siglent.com/u_file/download/22_09_19/SDS2000X%20Plus_Datasheet_EN01C.pdf

-3dB BW for these 100 MHz models is tested and confirmed with 3 waveform sources at ~185 MHz:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2958288/#msg2958288

gf:

--- Quote from: tautech on September 20, 2023, 08:43:30 pm ---
--- Quote from: Yellie on September 19, 2023, 03:49:03 pm ---I received a Siglent SDS2102X Plus scope a few days ago and wanted to the test the specs.

--- End quote ---

Why? Risetime is stated in the datasheet

--- End quote ---

It's not like you don't trust the datasheet. The journey is the destination - you just need to have measured it yourself once (and understand what you are doing, and why you do it the way you do it) ;) Consider it an exercise.

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