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| Testing risetime and bandwidth with a Siglent SDS2102X Plus |
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| gf:
--- Quote from: Yellie on September 20, 2023, 12:52:59 pm ---Hi Performa01. That looks near a squarewave, so it must be possible. ... So it must be the AWG. A litlle bit disappointing about this feature --- End quote --- It is possible. However, did you realize that Performa01's SDG7102A is 20x faster, and that it has a price tag of > 10,000 bucks? What you get meets the specs given in the datasheet. Keep in mind that a 125 MSa/s AWG -- which is based on band-limited Nyquist-Shannon reconstruction -- can hardly do much better than 24ns rise/fall time w/o introducing significant overshoot, and jitter at certain frequencies and pulse widths. Why be disappointed if it performs close to the feasibility limit anyway? Btw, don't use an AWG if you want square waves with fast rise/fall time. Rather use a dedicated pulse generator. For instance, the Si5351 clock generator chip achieves about 1ns rise time, and inexpensive Si5351 boards are available for 30 or 40 bucks. Or get e.g. a Leo Bodnar pulser if you need even faster edges (significantly shorter than 1ns). |
| Martin72:
--- Quote ---(significantly shorter than 1ns) --- End quote --- A little bit - 40ps... 8) 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. |
| gf:
I think it was Performa01, too. Sweep slowly with a leveled RF generator and let the scope record the result with FFT with peak hold. FFT window was rather short, just covering a small fraction of the sweep time, and peak hold accumulates many FFT windows. |
| 2N3055:
--- Quote from: gf on September 20, 2023, 05:58:41 pm ---I think it was Performa01, too. Sweep slowly with a leveled RF generator and let the scope record the result with FFT with peak hold. FFT window was rather short, just covering a small fraction of the sweep time, and peak hold accumulates many FFT windows. --- End quote --- You still need a 500MHz sinusoidal signal source with very good amplitude flatness... But there is no need to "verify BW". Scope is just fine. I agree 100% with tggzzz that OP should start learning as much as he/she can how to use the scope, probes, caveats, trials and tribulations.. --- Quote from: Yellie on September 20, 2023, 11:47:55 am --- But in the background there is always the question, do I get real value for my money? ;-) --- End quote --- You bought best scope in it's class. Most of the problem with it is that it has thick book you need to learn to even start to use fraction of it's features. My best suggestion would be to just take a tipical project you are interested in and start experimenting and learning. There is only one thing you need to be carefull: make sure to not overload scope in 50 Ω input mode. I would suggest to start your learning figuring out why it is so...... P.S. tggzzz has very nice web site with many good articles in regards to scopes and probes. Make sure to read it.. |
| BrokenYugo:
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 |
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