OWON Oscilloscopes

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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:33 am 
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Posts: 187
It can say that this is really huge improvement after SDS series. Can not even compare.

It is still also portable. Construction is not so thin than SDS series but still quite thin. With optional Li battery it is also very portable. With battery it can also use for floating measurements.

(WARNING: take care about safety and really: DO NOT USE with high voltages or currents if you really do not have professional level knowledge about risks and fully know and understand all things related to electric safety. This really need understand and if you have not educated for working high voltages or high currents, do not even try, independent of if scope is floating or not. Thumb rule: without enough practical and theoretical knowledge, do not work over 48V levels and where short circuit current may exeed 5A - for your safety.)

Rigol DS1000Z have more features, but if really look important basic things, signal capture quality, samplerates, display quality, UI, front end noise floor, Rigol mysterious Sinc fake what leads level errors, battery option, Wi-Fi option, Touch panel option, 12bit models FFT, fan noise etc

I have owned and used Rigol DS1000Z. Yes there can have fun hours if like toy plaaying with hundreds of features, bells and whistless.. If I need simple good tool for work. I do not think 3 seconds which one I select, exept if I need cheap 4 channels. Also Riglol is very slow in use. Perhaps nice for hobby and entertainment but for working where do not need all "nice to have" bells and whistles... and 4 channels with shared 1 channel slow response controls. It feel like museum age Tektronix 700 --- Not for me if there is not any other way, example LeCroy MAUI.
Owon is not at all perfect but UI is quite fast and in use.

After half hour use I did not like it at all, after 2 hours use -- so so, after half day I like it and after 2 days use, I like it more. Specially after start learn to mixing Touch panel use together with normal controls.

I can not say anything about any options what are later available.
At this time when I get it only Wi-Fi and TOU was available.

What I like also, If room is silent, it is silent also after power on this scope.
Fan is very silent. First feel was that there is no fan at all. Inside of scope fan is not near outer box. It is inside hardware "sandwitch" construction.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:34 am 
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I will later made much more tests. After scope arrive to my hand there was really short time for any tests before I have been nearly 2 months travel.

Some more words about oscilloscope internal FAN.
Scope thermal design is made so that FAN do not force airflow between inside and outside. FAN location is deep inside. There is Front case plastic, Front panel PCB + display layer, space, strong metal base and then back side of metal base plate is main board.
Fan is assembled between main board and base plate. It take air from space between base plate and front panel PCB. Fan force mainly only internal air circulation flow. It is enough for cooling critical components. Air flow between outside and inside is nearly like natural convection.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:34 am 
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Later some words by english.


Vähän toisenlainen testi. Owon XDS3102A (12 bit) ja SDS1202X
Koska skoopit ovat luonteeltaan niin kovin erilaiset erityisesti sen suhteen miten muisti ja näytön muodostus on toteutettu sekä eri horisontaali ja muistiasetuksilla wfm/s on vallan erilainen, samoin kuin sekin että Owonissa ei nykyisessä FW ole intensity grading ominaisuutta lainkaan. (kirkkausgradienttia sen suhteen kuinka usein ADC data on ollut sama verrattuna hiukan aiempiin.)

Kuitenkin skoopit ovat vastakkain niin samoilla asetuksilla kuin suinkin ja saavat rinnakain saman signaalin splitattuna.
Koska Owonin alin täydella kaistaleveydellä oleva vertikaaliherkkyys on 5mV/div on sillä testatu. Koska Siglent on 8 bittinen on myös Owon tietenkin asetetu 8 bittiseksi ja koska Owonissa ei ole 50 ohm tuloasetusta on molemmat 1Mohm.
Molemmissa samplenopeus 1GSa/s. Koska Siglentissä 1ms on hitain jolla edelleen saadaan yhdelle kanavalle 1GSa/s on testattu sillä. Owonissa on enemmän muistia (40M) joten sillä pääsisi alemmas edelleen 1GSa/s.

1 kuvapari:
Skoopit RUN 1ms/s ja sitten STOP. Siitä zoomaus (t/div nupilla) 50ns/div (tällä asetuselle edelleen näytön yhden ruudun matkalla on 50 ADC samplepistettä.

2. kuvapari:
Skoopit RUN 1ms/div. Ikkunoitu zoomaus 50ns/div (tietenkin siis edelleen RUN eli kuva "lennosta".

Huomattava että Siglent on 200MHz malli ja Owon 100MHz malli joten kohinasta ainakin satunnainen ns termisen kohinan osuus olisi teoriassa isompi. Ai n iin, signaali itse on senverran puhdas että siellä olevaa geniksen kohinaa kumpikaan skooppi ei pystyisi havaitsemaan lähellekään. Signaali on 1MHz siniä ja peräisin hiukan paremman luokan Agilentin RF geniksestä.


Image

Image

Image

Image



Mitä tästä sanoisi, tai sanoisiko mitään. Kuvat kertovat.
Joku tietenkin vääntää sen muotoon että yksi kuva valehtelee enemmän kuin tuhat sanaa.

Pakko sanoa kun skooppeja vertaa livenä naamatusten.
Siglent on hiljainen. Owon on vielä hiljaisempi. (ainakin jos vertaa Rigolin turbiineihin)
Siglentin kuvaruutu on hyvä. Owonin kuvaruutu on vielä parempi. (ilmeisesti TFT laatu kirkkaus/kontrasti/katselukula on Owonissa parempi. kuten myös SDS sarjassa kautta aikojen ollut todella hyvälaatuinen TFT.)


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:35 am 
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XDS3000 as most of digital oscilloscopes have pass/fail function.

User can set test mask and then run scope. If signal hit mask then test result is fail and if signal stay inside mask limits then result is pass.
Mask is transparent so you also see signal what goes mask "fail" area.



Owon mask test is quite fast. It can do test with full wfm/s speed independent of test result (up to over 66000 mask test/s). There is counter what count pass, fail and total.
Also oscilloscope can stop if fail. It can beep for pass or fail depending user settings.

Also there is pass/fail signal output. This output have two functions, Trig out or pass/fail result out. Pass fail result output pulse is not as fast as test itself. But if there is even one fail when scope run full wfm/s speed it still give signal. It looks like limit is somewhere 5000 ~ 10000 fail pulses /s if fail rate is higher it do not recover between every fail.

It was nice to see it is full speed mask test. Good work Owon!

Really big big step after years ago lauched SDS model what also is still in production.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:36 am 
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Image

Kuvassa pass/fail ilmaisee glitchin. Ei pysähdy siihen vaaan jatkaa. Glitchi jää näkyville koska persistence on päälllä.

On valitettavaa että Owonin FW:ssä on bugi jonka johdosta se kuvan kerros jossa on mittaustulokset ja myös pass/fail laskuri ei tulostu kuvaan.
No, kuitenkin tuossa signaali oli siten järjestetty että pääsignaaliin on injektoitu noin 1:1000000 suhteella tuollainen pieni glitchi jokseenkin satunnaisella hetkellä pääsignaaliin nähden.

Signaali näyttää "paksulle" koska siinähän on pinottuna melkoinen joukko vaakapyyhkäisyjä johtuen wfm/s nopeudesta ja näytön päivitysvälistä.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:37 am 
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Very short and simply "first test" about delay jitter.

Result is - simply - amazing good. So good that this clearly need more deep tests.

But this is not first time with Owon. Years ago SDS7102 was oscilloscope what I have used many times for characterize some function generators time jitter things just because I find Owon very handy and also enough aaccurate for these purposes. This time I did not hava available better. Even with old much higher class old HP professional grade oscilloscope was clearly below Owon in this special thing.


Also it is nice to see Owon have done windowed zoom right way in one feature. When I change zoomed timebase I do not need do "endless" adjustments for find zoomed window to position what I want it keep its position where ever zoomed window center is in original unzoomed timebase related to trigger time position. Siglent modern models are quite good but here in this feature they need learn lot of from Owon.

Also it is noce that in windowed zoom mode zoomed window vertical scale is bigger than unzoomed. This is right way. In zoomed window, when user need zoomed, there are things what user look.



Image

20M memory, 2ms after trigger position. Zoomed to 2ns/div. There 2ns (one div) is 1ppm from delay time. Where is jitter?


DO NOT believe this image. There is bug explained below.
Image

Then I meet Mr- Bug.

I turn trigger position to 50ms where adjustemnt just stop and I think it is maximum. But when I turn I can detect that near 59ms trace do not change...
After then I take it agen, from zero delay to up using 2ms pulse period and only main window. All goes ok until delay reach 30ms. After then I can turn it up to 50ms where it stop but after 30ms trace did not move.
After several different tests from trigger position to center, maximum delay is 30ms if scope have this setting 40M and 2ms/div.
With 5ms/div same limit is consistently 75ms.

(you can read this image so that real delay from trigger point to centerline is 30ms instead of 50ms what read in image. With this correction image is quite ok but signal source quality (related to jitter) is not perfect for this test with this time delay. For 2ms delay it can (barely) accept)


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:38 am 
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Here better test for trigger jitter using signal source what itself have so low jitter that I believe this is nonsense in this kind of test. (HP/Agilent 8644B using internal exellent quality low phasenoise/jitter HP OCXO reference.
For collect jitter/drift there was infinite peersisstence used because 5s is too short and next step is infinite. Waiting time around 20~40s (bit slow to swith image store becaause Owon have not implemented one button fast image save (and I did not setup Wi-Fi at this time for images. Other eternity question is (not only for Owon), why there is only .BMP format... I will recommend there is least .PNG selectable. 20k image is enough instead of 1.4M. (but keep bitmap still selectable but not as default)

Image

For reference just 2ms/div zoomed to 2ns/div with zero delay time.

(note bugs:
1. randomly drop some image layers out when storing to USB, in this case information text between top and bottom image

2. Zoomed window 1ns (1 ADC sample cycle) time position error. If change to 20M memory, postion is correct.)



Image

Here same but delay 20ms. Exellent! <0.02ppm p-p


(note bug what randomly drop some image layers out when storing to USB, in this case information text between top and bottom image)




Image

Agen same but now delay -20ms. Exellent. <0.02ppm p-p


(here it did not drop out text between top and bottom window)

Dealy time is 20 000 000ns so 2ns equals 0.1ppm.

Result is really exellent. (exept these bugs what need repair in some later FW... this is still very first FW)


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:39 am 
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As someone ask somehow concretize what is difference in practice between 8 and 12 bit.

There is 2 image where 8bit is used and next two wheere 12 bit is used.

First there is image with running. After then stop and vertical zoom (10x)




Image

8 bit run

Image

8 bit run stopped and then vertically zoomed 10x




Image

12 bit run

Image


12 bit run stopped and then vertically zoomed 10x
of course due to higher resolution it finds noise what are not detected using 8bit resolution.

Note that if run this same signal with this vertical setting it is really different case just as if we run this 8 bit using these settings used for zoom.. there of course can not see stairs and for 12 bit mode it is of course more clean.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:39 am 
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I have tested some amount of serial (UART/RS232) just for detect if there is any signs it may work. This because when I purchase it there was not at all available serial decoding option.

But oscilloscope have in its trigger functions also "BUS". So I try what it do.

After some "look around and test many settings" I feel that it is interesting.

Example, when I set bus trigger for RS232 and right parameters, 9600 baud, 8 data etc.
I set scope for trig data (decimal 143 because I know this is near beginning of around 100 bytes message)

Rock solid. Even if I set horizontal to 5s/div and zoom I can see it trig rock solid to this data byte. My message is from GPSDO what send message every one second... I can see 5 messages in second and zoomed to trigger point there is rock solid trig to message first byte where exist this "143" (hex 8f)

Also if select start or stop instead of data, it trig pefectly.

This make it interesting and now I really hope I can soon get Decode option. This really looks interesting. (because this bus trigger works so good. Just opposite what other way good scope Siglent do.
But as we know Owon have long history with oscilloscopes equipped digital functions. Se this may be explanation.


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 Post subject: Re: Owon XDS3102A information, Tests!
PostPosted: Wed Jan 20, 2016 11:40 am 
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Some tiny test with "Bus" trigger mode for detect if there is any hope for good serial decode. There is, bus trigger works rock solid and also lenght of record is nice but I hope it is so also with decode option. At this time test with RS232 because continuous data stream was available (from allways on GPSDO). I can not test how decode works because I do not have this Option (yet).


Image

Because saving images to USB keep always save menu visible I have set scope for Wi-Fi connection.
Also it looks like it do not drop out randomly some display layers out from saved image as direct save to USB do, due to some bug. Sidenote: My XDS is with touch panel and it can use also fully mixed with buttons and ttouch. In some cases it is handy but need some experience first.



Image

Trigger is set for Bus and selected bus RS232. There I have selected Data trigger and set it trig for byte value 171 (decimal)
Note also what is whole timebase and memory.

Data stream is one message every second. Message lenght is in this case around 93 bytes. Speed is 9600 baud and 8 databits



Image

Continue running it using infinite persistence. Just: Rock solid. After two 0 bytes there is changing data what can see right side of zoomed window.



Image

Set trig for first byte what value is 0. Rock solid.



Image

Set trig for first byte what value is 143 (Decimal). Rock solid.


I do not have nice RS232 test string generator where can also simulate errors and set data string for what ever size and speed and data. But this tiny test is enough for give feel that I want test more. But I do not waste time for this bus trigger alone more because it looks well made. Important is now to know how Decode works. Trigger (bus mode) works rock solid so now it is least possible that Decode also works. Without perfect trig there is not hope.
I hope I can get soon Serial Bus Decode Option so I can do some tests how it decode and how is its useability.


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