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New (DSO203) portable oscilloscope! — Parallax Forums

New (DSO203) portable oscilloscope!

electrosyselectrosys Posts: 212
edited 2012-11-09 10:30 in General Discussion
A new portable oscilloscope is on the way: DSO203
Some of the features:
30MHz analog bandwidth
Two probe connectors, 4 inputs & 4 tracks (2 analog 2 digital)
3" 240
DSO.jpg
720 x 400 - 68K
DSO203 I.JPG
731 x 573 - 52K

Comments

  • Peter KG6LSEPeter KG6LSE Posts: 1,383
    edited 2010-11-17 07:21
    DADY WANTS !!!!!

    ""is that a iphone . nope its my O-scope ."
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2010-11-17 08:27
    Who really needs an iPhone? This is cheaper and soo.... much.... more fun.

    Is there a Propeller inside? If so, it should have a little logo sticker on it to encourage us.
  • Nick MuellerNick Mueller Posts: 815
    edited 2010-11-17 10:10
    Well, looks cute, BUT!
    If 1 MHz bandwidth is enough for you, 1Msps still doesn't fit the bandwidth. 1 Msps equals 100 kHz bandwidth.


    Nick
  • tonyp12tonyp12 Posts: 1,951
    edited 2010-11-17 16:01
    if you look at the prototype, the schematic mention this ARM 3

    http://www.mouser.com/ProductDetail/STMicroelectronics/STM32F103VCT6/?qs=sGAEpiMZZMvu0Nwh4cA1wf8bzqBH8XzckwyPFT1Ph04%3d

    ►The AD9288-40 Overclocking to achieve 72M+72M sampling frequency, so that the maximum single-channel sampling rate up to 144M.
    ►Analog channel circuit using unity gain> 150MHz op amp, so the actual 30MHz analog bandwidth is expected to do more.
  • electrosyselectrosys Posts: 212
    edited 2010-11-18 01:23
    @Nick
    The actual page is about ARM DSO Nano Pocket Oscilloscope ($43.20+$29.95) the ARM DSO Nano, has a 1Mhz bandwidth,...
    Look at the middle of the same page, under: Advertisement: New Products, Coming soon!!!
    This one is about DSO203 oscilloscope which has the actual 30 Mhz bandwidth.
  • electrosyselectrosys Posts: 212
    edited 2011-01-01 09:18
    You can now pre-order the DSO Quad oscilloscope (beta test price $159) Estimated shipping time is early March. There are 300 unit (278 in stock) for beta testers at seeedstudio.com
    Retail price: 199USD
    Beta test price: 159USD

    DSO Quad:
    Two 36Mhz analog channels and two digital channels
    Signal Generator
    Auto Measurement
    Various Triggering Option
    Easy waveform storage
    Firmware upgrade
    ....................
    Read more at: http://www.seeedstudio.com/depot/preorder-dso-quad-beta-test-p-736.html?cPath=174
  • bigboybigboy Posts: 1
    edited 2011-06-12 20:41
    i just bought one from China at 173.55USD, free shipping, Jun 1, i receive the oscilloscope with a crushed LED screen, i think it may be crushed between transportation, so i contact the seller, the seller is very friendly and helpfull, they told me to sent the broken dso back to China, and they paid for the freight, that is acceptable :)
    now, i have received a new DSO203, it is in good condition, they packed it with a stronger box.
    i highly recommend this item, if you are looking for similar products, you can think about this.

    i bought it here: http://www.diyertool.com/dso203-pocket-sized-digital-oscilloscope-arm-dso-nano.html

    Best wishes,
    Sharon Feerick
  • BeanBean Posts: 8,129
    edited 2011-06-13 09:40
    Sparkfun now carries the DSO Quad for $224.95

    http://www.sparkfun.com/products/10388

    Bean
  • BeanBean Posts: 8,129
    edited 2011-06-16 08:28
    I just received my DSO Quad from sparkfun.
    Nice little unit.
    First impressions:
    The digital probe connectors are super tight. I had to use pliers to unplug them. They'll probably loosen up with use.
    1 or 2MHz is about the analog input limit for square waves. Above that and they really get rounded off.
    The digital inputs are good to about 1MHz too. Even at 1MHz the duty is really off showing about 75% instead of 50% and gets worse at higher frequencies.
    I updated the firmware and it's not too hard, but it took awhile to figure out the correct files to use.
    It does NOT charge when on. Kind of a bummer.

    Overall I am impressed with it. Quite nice for $225.

    If anyone has any questions about it just post them and I'll try to answer them.

    Bean
  • Luis DigitalLuis Digital Posts: 371
    edited 2011-06-20 07:54
    Hello Bean,

    You can do a review? Something like this:
    http://www.youtube.com/watch?v=59hdyXSYqsE

    Thank you.
  • John A. ZoidbergJohn A. Zoidberg Posts: 514
    edited 2011-06-26 17:53
    Those little oscilloscopes are nice.

    But I just need a normal oscilloscope which I can detect waveforms at around 1~100kHz frequency range. Could this "2Msps Sampling Rate ARM DSO Nano Pocket Oscilloscope" cut it? :)
  • Luis DigitalLuis Digital Posts: 371
    edited 2011-06-27 07:43
    Testing DS0201 Mini Oscilloscope
  • cristian937cristian937 Posts: 3
    edited 2011-12-21 23:54
    Hi,
    I have bought a DS0203 quad, and as you say when I try to display a square wave with frequency greater than 1MHZ, what I see is a rounded form or an distorted wave that not seems being a square wave.
    But the specification for DS0203 quad say: "72Mhz analog bandwidth" !!
    So, do you have any suggestions to resolve this problem, or It's a limit for this device?
    Please apologies for my poor english. :(

    Many thanks
    Cristian
    Bean wrote: »
    I just received my DSO Quad from sparkfun.
    Nice little unit.
    First impressions:
    The digital probe connectors are super tight. I had to use pliers to unplug them. They'll probably loosen up with use.
    1 or 2MHz is about the analog input limit for square waves. Above that and they really get rounded off.
    The digital inputs are good to about 1MHz too. Even at 1MHz the duty is really off showing about 75% instead of 50% and gets worse at higher frequencies.
    I updated the firmware and it's not too hard, but it took awhile to figure out the correct files to use.
    It does NOT charge when on. Kind of a bummer.

    Overall I am impressed with it. Quite nice for $225.

    If anyone has any questions about it just post them and I'll try to answer them.

    Bean
  • LeonLeon Posts: 7,620
    edited 2011-12-22 01:43
    It's poor value compared to the €299 50 MHz Rigol DS1052E, which can be hacked to give 100 MHz bandwidth.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-12-22 09:25
    Just remember that a scope with a 100 MHz bandwidth will not display 100 MHz square waves as square, but as sine waves. A 100 MHz square wave includes harmonics at 300 MHz, 500 MHz, ..., and those get lost.

    -Phil
  • cristian937cristian937 Posts: 3
    edited 2011-12-23 05:36
    Hi All!
    Thanks for your replies. Ok I understand the problem but I have used an input signal with frequency of 4MHZ that is much smaller than 72MHZ.
    At the start I thought the the problem was in my circuit, so, to eliminate any doubt I have connected the DSO203's output (generating a square wave with frequency from 1MHZ to 4MHZ) to the CH1 input and what I see on display is the same result: a rounded form or an distorted wave that not seems being a square wave.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-12-23 10:54
    What kind of test probes does the scope come with? If they're uncompensated or poorly compensated, that may also cause the results you're seeing. Here's an article that includes information on test probe compensation:

    -Phil
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-12-23 12:08
    One additional note: the specs say that the sampling rate is 72Ms/s, not that the analog bandwidth is 72 MHz. Those are two very different things. If the analog front-end attenuates high frequencies, no amount of rapid sampling can bring them back.

    -Phil
  • cristian937cristian937 Posts: 3
    edited 2012-01-02 04:19
    Thanks Phil,
    but with a sampling rate of 72Ms/s the bandwidth is about 36MHz. And my square wave has 4MHz of frequency. :(
    I have repeated the same measure with an old oscilloscope (bandwidth 20MHZ ) and I saw the square wave perfectly.
    Anyway, thank you for your patience and courtesy.
  • BeanBean Posts: 8,129
    edited 2012-01-02 09:34
    cristian937 wrote: »
    Thanks Phil,
    but with a sampling rate of 72Ms/s the bandwidth is about 36MHz

    36MHz would be the bandwidth LIMIT. The actual analog path would have to be perfect (no attenuation at any frequency) to achive that.

    The DSO203 is good to about 1 MHz to 2 MHz, after that signals get very rounded. This is caused by the analog path, not by the digital sample rate.

    It's kind of like having a digital camera with a poor lens. No matter how high the megapixel resolution is, the image will always be blurry.

    Bean
  • xanaduxanadu Posts: 3,347
    edited 2012-04-02 15:32
    Is it normal to not be able to change the volume on this thing? Mine seems to be stuck on 60%. Thanks.

    Nevermind, figured it out lol long day.
  • jmgjmg Posts: 15,164
    edited 2012-04-02 19:27
    There is also another step up, this 7" 100MHz 1GSPS scope...
    I like the 6 digit frequency counter.

    http://www.uni-trend.com/UTD2102CEL.html

    eBay suggests prices of ~US$340, vs $180-$200 for DSO203, depending on case choice.
  • varpavarpa Posts: 1
    edited 2012-11-09 08:35
    Hello there.
    I am new to this forum and I recently bought a DSO203 and I am having som questions that maybe you experts could answer, and I think that others have the same questions too.
    The first thing I saw on my dso was that when I set V/div on, for example, CH A to 1V it measures just fine but when increasing the voltage/div it starts to give some faulthy values. When I connect CH A probe to itself it should show 0V but over 1V/div it shows more than 0V. At 10V/div it shows +2.40V. Does it need to be calibrated or what is the cause of this?

    Hope my english is good enough for you to understand the problem ;)

    //Robin
  • CircuitsoftCircuitsoft Posts: 1,166
    edited 2012-11-09 10:30
    varpa, Welcome to the forum.

    http://www.seeedstudio.com/wiki/DSO_Quad_Manual_(by_the_community)#Calibration
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