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Siglent - 11/20 - New SDS1104X-U, 4 channel 100MHz, 1Gsa/s economy oscilloscope
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TurboTom:
Thanks @rf-loop for demonstrating this kind of performance. It's not even worth to try to match that with any of the FFT implementations of the "mature" Rigol scopes. I don't know about their more recent designs or other manufacturer's products. But it seems that noise- and FFT-wise, the engineers at Siglent really did their homework! It's quite interesting to watch how the products evolve, especially since hardware-wise, the DS1000Z and the SDS1000U aren't too far apart, except for the main SOC silicon... I guess, the software approach makes most of the difference, of course in combination with the more powerful Zync SOC/FPGA combination in Siglent's product. I'ld actually love to see a very compact scope (like the DS1000Z), equipped with the grunt of an SDS2000X Plus or (probably more realistic) of a DS5000.
rf-loop:
It is not one or two time when someone ask how to get AM signal trig'd  to modulating frequency. Of course old traditional answer is, adjust Trigger Hold Off  time. Yes it works. But, it is also very poor method. When modulating frequency change bit more adjust again.. adjust again.. some times very frustrating. Also I have seen many times peopled give advice to use trigger holdoff.  All modern digital scopes have lot of more clever things that these traditional things what come from analog oscilloscope era.

With this method here trigger can be rock solid without any adjustment over whole normal audio range (90us in image is too long time except if need trig to very low, well under 10Hz, mod frequencies what are not normally used).

This modulating freq change speed is not constant. This is not at all because scope trigger. This is how I adjust generator what is not very handsome  for this purpose.

Signal is 21.2MHz and modulation stepped 10Hz - 4kHz.



Of course this is not just Siglent SDS1104X-U feature. Most modern scopes have this or other suitable trig functions for this.
rf-loop:
SDS1104X-U  have also timing inaccuracies as all oscilloscopes have more or less.

It is good to know least roughly how much is scope own time jitter when we try measure some signal jitter what we do not know. Of course if you have oscilloscope in your hand you can check it quite easy, if you have tools. But all do not have. Data sheet tell only roughly how big error there can be in frequency but it do not tell anything about how much it have jitter. Also just this time I do not have signal source what jitter I know sure but with other scope I can compare. If other scope is much better with it I can enough sure that test signal have same or less jitter but it can not be more.
So here is test. Same one signal come from signal source and it is split to both scopes and test is made simultaneously just in same time.
Other scope is SDS2104XPlus what have quite good reference. How ever I try SDS2104X+ can not show more total jitter over 10ms than up to 0.5ns peak to peak over more than 15minute period.
After then I start both scopes with around same settings and infinite persistence.
In image there can see SDS1104X-U result and for compare in same image is SDS2104X+ result.
Is it  much or not. It depends what user is doing. It is ≤ 0.6ppm peak to peak.  So,  1ms something like 0.6ns.
SDS1104X-U most fast time scale is 2ns/div.



Of course this is just one individual scope so do not take this result as "data sheet".
Btw in SDS2kX+ image can also see corners "wobbling" because what is not of course from scope in this case.

rf-loop:
Images tell.


Only one wonder. In sequence mode it is bit faster than SDS1104X-E if look top speed.



Note, history buffer wfm amount is same as sequence mode maximum amount.



Really this wfm/s thing is not most important thing. Also there may exist more fast burst speeds but I do not note these. Some manufactures may also use these peak speed. These are not peak speed but continuous average wfm/s  speed least over 1s. (sequence speed is different thing)

tautech:

--- Quote from: EEVblog on December 04, 2020, 04:20:53 am ---Apparently one is on the way to me. Wioll be interesting to see how stripped down the design is compared to the existing model.

--- End quote ---
3 weeks pass and only crickets.  :-//
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