DSO203 handheld Aluminium Digital Oscillo?scope .Is it worthy? - Page 1
Forum section: electronics / testgear

author: kerrinal
author_rank: Contributor
timestamp: June 18, 2013, 06:34:58 am
content: My friend just ask me for the DSO203 handheld scope.Is it cheap for the DSO203,Let's talk about it.I just find a dso203 on ebay.http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=271160345410&ssPageName=STRK:MESE:ITIts bandwidth isn't listed anywhere, only its sample rate, which is 36MSPS. This means that We'll be limited to 18MHz signals in theory, but in practice maybe about 5MHz. Then there is the question of the analog bandwidth of the input amplifiers, which typically needs to be bigger as well, since the bandwidth is specified by the 3db amplitude drop. Rule of thumb is that the amplitude should be 10 times the bandwidth needed.The analog bandwidth for the DSO203 is listed as 30 MHz (and noted further by: "Analog channel circuit using unity gain >150MHz") and the sampling rate is adjustable up to 72MHz. They provide schematics if you don't believe them (I don't take much on faith, but that is what they claim and unless someone wants to model that, I have no better info). That being said, even your reply indicates use above audio frequencies, at least 3 orders of magnitude more actually.I used to determine 36 MHz -> 5 MHz RTBW in practice. SinX/X interpolation requires a factor of 2.5. That is, a digitizer running at 36 MHz (or 18 MHz quadrature) will be suitable to provide 36 / 2.5 = 14.4 MHz of real-time bandwidth, provided suitable analog circuitry exists. Oscilloscopes often have much higher sample rates to ensure higher rate signals do not alias (3dB, which you are correct about, is not sufficient rejection).Again, not saying this is a worse deal or a worthwhile piece of test equipment, but we really need to know Whether it is useful for us.after all,it is just a handheld oscilloscope.If you need much more function or powerful scope. you can chooseowonorsiglentbrand scope.but you really need to use caution with your statements like "Its  of useful ( or useless) above ___"... People just might think you are providing reliable advice.

author: dr_p
author_rank: Frequent Contributor
timestamp: June 18, 2013, 07:17:22 am
content: I have this:and I find it annoying not to have physical knobs for the adjustments. And mind you, I do have separate buttons for each adjustment. That tiny DSO you linked has neither. The screen is small, interface probably sucks. It's gonna be a royal PITA to use. No proper BNC jacks, so if you break the probes or the connector you're screwed. Max 80Vpp on the input ...the performance is crap, but for audio and sub 1Mhz it's probably ok as a waveform viewer. BUT THE PRICE? Paying 170$ for that is just crazy.If you don't trust, listen to a beginer then: don't buy that POS crap!

author: kerrinal
author_rank: Contributor
timestamp: June 18, 2013, 07:27:19 am
content: I just find the scope on ebay DSO1060 .But it charge 346 bucks and 51$ shipping fee.That's too much

author: Pinkus
author_rank: Frequent Contributor
timestamp: June 18, 2013, 08:55:11 am
content: do not buy this unless you already got one or two decent scopes and you just want a spare unit in your on-the-road-toolbox. This thing is only usable for checking if there is any signal at all. It is nothing for serious measurement.Trust my words: if you buy this, you will go and buy a real scope as soon as you have the money for this and you will hate yourself not listening to us and throwing your money out of the window on this DSO203 (or similar).So, just save you money buy not buying this crap and get a real scope.If a Rigol DS2072 is too expensive for you right now, get a Rigol DS1052 or a Hantek DSO5062 instead. They should be OK for you and you can always sell them for a good price.

author: BillyD
author_rank: Regular Contributor
timestamp: June 18, 2013, 09:10:57 am
content: Complete waste of money. You'll hate it.Also take a look at mikeselectricstuff on youtube where he reviewed a variant of this.

author: dr_p
author_rank: Frequent Contributor
timestamp: June 18, 2013, 04:20:53 pm
content: Quote from: kerrinal on June 18, 2013, 07:27:19 amI wasn't implying you should buy it. I just used the DSO8060 for comparison because that's what I have.Buy a second hand analog scope (2ch, 20...60Mhz) or save for a cheap yet proper DSO (Rigol, Hantek, Siglent, Owon etc)

author: ben_r_
author_rank: Frequent Contributor
timestamp: June 18, 2013, 06:39:01 pm
content: Didnt Dave do a video review on one of these handheld pocket deals. Yea def a waste of money, just save up a bit more and buy a proper entry level scope.

author: kerrinal
author_rank: Contributor
timestamp: June 19, 2013, 03:12:51 am
content: How about the DSO 201.It just about 60 bucks.pocket size digital storage oscilloscope. ARM Cortex-M3 compatible 32 bit platform compatible/

author: Lightages
author_rank: Unknown
timestamp: June 19, 2013, 03:19:23 am
content: All of these pocket oscilloscopes are toys,junk, and unsafe over 30V. They are most likely to mislead you rather than assist. Cheap junk for fun, if that's all you want.

author: dr_p
author_rank: Frequent Contributor
timestamp: June 19, 2013, 07:51:30 am
content: Quote from: kerrinal on June 19, 2013, 03:12:51 amThe price is right on this one, but it's still a toy. Might as well use your PC sound card for signals within audio bandwidth, and that's free.

author: tinhead
author_rank: Super Contributor
timestamp: June 19, 2013, 08:46:27 am
content: they both crap and both not worth the money. The QDSO/203 crap wasn't even wort more than 57USDhttp://www.ebay.com/itm/200932930155so no thanks (and btw don't get confused with all what "kerrinal" is posting, he seems to make some advertisement for his crap ebay shops)