@rf-loop,
when you have time please measure bw of SDS8202, i think it will be something like 250MHz
Yes it is nearly.
But as we well know, more and more high freuency and impedance matching go more difficult.
0 - 100MHz with this kind of input is not big problem to match with 50 ohm terminator connected to input.
(if take signal directly from 50 ohm source via 50 ohm cable.) Of course problem start littlebit but not bad.
100 - 200 MHz and problem is more bad. Over 200MHz it is so bad that what we test.. our signal road or oscilloscope itself.
It is pity that this kind of scope do not have 50ohm impedance inputs. (I do not mean that terminator resistance is inside scope. I mean impedance 50ohm for this whole frequency area.
If look only one example. 15pF reactance at 200MHz frequency is around 53ohm. If forget all other things in practice there is 50ohm terminator and parallel with it 53 ohm reactance. Simply: I can not simply measue oscilloscope itself frequency response becouse I have not well matched feedline to oscilloscope. If I do it, I measure whole system response only. With 100MHz it is also there but error is "acceptable".
With extremely bad matching, 50ohm terminator connected to oscilloscope input (1M, 15pF +-5pF) I can see that scope show -3dB point around > 230MHz. (this is not scope response, it is system response what is more bad than scope itself... and here around >200MHz this error in measurement come really markable)
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This is not for Owon. This is for ALL manufacturers today. And littlebit more to Asian manufacturers.
They must not hide specifications. They can sell one machine. People read specs and ads and then he have "waiting value" that it works as he have dreamed after he have read machine introduction/ad.
Now if it do not work as he have dreamed it is big disappoint and around of world or with himeself he talk how bad it is - just becouse he was dispappointed. Maybe machine still work and is just ok to what he need but becouse he was dispappointed his feel is "this machine is peace of bullshit". Maybe he feel fooled and also this Company is bad lyer in his mind.
Please peoples, do you homeworks. Study how to read datasheets, if it is cpomponent, multimeter or oscilloscope and go to look mirror. First study basic low level things how stuffs work, then read lot of material how professionals teach how to read datasheets in professional use for designing and how important are also application notes and also all these small note texts just as in insurance deal papers.
After all you still read ads and specs, nice pictures and so on. manufacturers do lot of introductions and maybe also copmare they machines to others. These are many times so biased and they find most nice way to compare so that they own looks ten times better. Well known case is this HP - Tektronix game (specially with oscilloscopes)
(look specially what they do not tell... do not come blind after they talk what they want talk - watch carefully and deeply what they do not tell. This is sometimes maybe most important thing to find)
Try to find Agilent papers what tell exactly memory depth and samplerate it use with different settings (you can not find) and what it can or can not use. (example after you read this wfrms/s bullshit or half truth. yes they do not not exactly lie but...
I think some manufacturer may win who is honest and who do not give peoples feel disappointed and fooled.
Who is first who understand this -- and also... do it in real worlkd!
I want be one small small part of this system what teach this to Chinese. They can win in end if they want. But what they need start. They need start learn how to be more open. How to be honest. This old culture of clever smart seller who can sell chickens with heavy rocks and stupid buyer need stop. Everyone can be smart seller and fool someone to buy and win his money - but he can do it only once with this buyer. World is now different. It works in old world where you move 5 kilometers and then you are agen new unknown. (or in big city it need 500 meter.)
With test equipments this may win who publishe most accurate and deep specifications and also real specifications. Not copypaste specifications from other manufacturers.
It was how Tektronix win tens of years example world of oscilloscopes.
There was even full detailed description and theory about inside circuits and full and updated schematics and service manuals etc.
No one copy these so that it is bad for Tektronix. No one. Why?
Owon grow in good tree... it is like raw apple. If they want, they can be better.
They need do some small things and one of these things are good and hinest specifications where people can exactly see what he buy... then he is not disappointed with his own developed dreams becouse there are not enough facts. (this is natural for peoples mind and it can also work opposite, you can hate something just becouse lack of knowledge. But you can also hate something if this something have destroy your own itself developed dream what was possible becouse lack of information)
After disappointed or feel like fooled.. peoples write they opinion. Many of these opinions may very easy destroy one name... or seriouslu damage it. There are thousends of peoples who have not write any opinions. Also in this unsocial media if peole is angry and disappointed he open more frequently his mouth as this kind off people who feel neutral or satisfied.
So, what I hope.
I hope some Chinese manufacturer start develop themselves. Owon is one good candidate.
Littlebit quality and reliability developing, littlebit more thinking for UI useability.
And accurate information about features and specifications.
Do not afraid and ashame specs details as they are. Truth can not really hide. If some detail is not so good please tell it also. If you hit information you give, with lack of information, that people can develop some "dream" that it have this or that feature. Then if he buy and there is not what he have dreamed... you maybe have get his money -- "fished and get his money" yes you are smaryt and clever Chinese business you can fish money from "stupid" poor educated buyers.
But if he is not in your boat and he is disappointed only becouse lack of information or even you have littlebit lie or as white lie information....
He may have to pour your fishing boat if he is not in the same boat with you.
So, if Owon or who ever manufacturer want win. Start develop design quality, quality control, start be more open mind and stop this shy and hide with specs. Real honest specs to table - please, and if do it right way - you win and customers win and both can smile.
Owon is not bad, it is one of most good oscilloscope in this price class. It give not se many dingle dongle features but it is good DSO.
Today with this FW and/or HW this SDS series maximum samplerate with more than 10k/channel memory is 1Gs/s.
If we talk
SDS7102 alone it have deep memory with full maximum samplerate 1Gs/s with one channel or 500Ms/s with two channel in use. This capture memory is selectable from 1k to 10Mpoints. Both channels have max 10M capture memory (not divided memory
SDS8102 and 8202 have not deep memory with full 2Gs/s. Maximum to deep memory is 1Gs/s with single channel or 500Ms/s if two channel in use.
With 2Gs/s in single channel use and 1Gs/s with two channel use there is 1k and 10k capture memory.
(in FW it is nice that if use fast horizontal speed and it use 2Gs/s then if you select more memory you can do it. It drops samplerate. If you agen select 1 or 10k it return this 2Gs/s. And becouse it always show samplerate on the display you always know what it is doing. (exept with low speed area if scan mode is used... there display show (this is bug) totally wrong samplerate, if slow speed mode (100ms - 100s/div) use normal or singleshot mode (not scan mode) it diplay right samplerate.