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Questions Before Buying — Parallax Forums

Questions Before Buying

runswithscissorsrunswithscissors Posts: 3
edited 2011-06-28 12:29 in Accessories
I am looking to use the propscope for automotive purposes 0 +15V and no more than 40KHz signal. My question is if I set the probes to 10x will it measure this without frying the scope.

Comments

  • sylvie369sylvie369 Posts: 1,622
    edited 2011-01-23 09:31
    Do not take my word for it - hopefully Andy and/or Hanno will speak up, but I think you'll be fine. This from the quickstart guide:
    Warning
    Do not apply more than +200 or less than -200 VDC to the input of the
    PropScope, otherwise permanent damage may occur.

    With the probes set to 10x you should have +/- 100Vpp.
  • kanekane Posts: 11
    edited 2011-01-27 19:44
    Since I am having problems getting the PropScope to work on Linux, it looks like
    I need to find an alternate solution to my problem. This low end scope looks pretty nice:

    http://www.rigolna.com/products/digital-oscilloscopes/ds1000e/ds1052e/

    Pat
    ---
  • Clock LoopClock Loop Posts: 2,069
    edited 2011-01-29 16:00
    runswithscissors wrote: »
    I am looking to use the propscope for automotive purposes 0 +15V and no more than 40KHz signal. My question is if I set the probes to 10x will it measure this without frying the scope.


    I use my propscope in 10x mode for diagnostics of waveforms for my x0xb0x. The peaks are around 15v.
    It has been absolutely necessary for the things I am trying to do to this x0xb0x.

    The price of the prop scope was well worth the amount of work it has done for me.

    (and if I kill it, i can repair it myself, with open schematics, code, etc, keep this in mind when purchasing another brand)
  • kanekane Posts: 11
    edited 2011-01-29 19:58
    Yes, I agree, I really like my PropScope, having the HW schematics is very cool.
    I just wish the SW was as open and the HW.
  • HannoHanno Posts: 1,130
    edited 2011-01-29 23:00
    Anyone interested in open source firmware that does something simple? Ie, stream out ch1 and ch2 voltages at a 9600 baud? You could hardcode ac/dc coupling and voltage resolution to keep things simple...
    Hanno
  • kanekane Posts: 11
    edited 2011-02-02 19:39
    Hanno wrote: »
    Anyone interested in open source firmware that does something simple? Ie, stream out ch1 and ch2 voltages at a 9600 baud? You could hardcode ac/dc coupling and voltage resolution to keep things simple...
    Hanno

    Yes, I want a very simple interface.

    I would love to connect to the PropScope from various mobile devices,
    like my EeePc and my Android phone. The later would be very cool.

    I'd like to help replace/extend the USB interface with a BlueTooth device,
    but that might take a rev of the PS HW.

    A wireless PropScope would be hot, esp. if it was mobile.

    Pat
    ---
  • Clock LoopClock Loop Posts: 2,069
    edited 2011-02-02 22:28
    kane wrote: »

    A wireless PropScope would be hot, esp. if it was mobile.

    Pat
    ---

    Slap a LIPO battery on the back of it and you have a wireless, FULLY isolated oscilloscope!!!!!!
    (no usb ground loop)
    LIPO:http://www.adafruit.com/index.php?main_page=product_info&cPath=44&products_id=328
  • HannoHanno Posts: 1,130
    edited 2011-02-03 16:45
    Have a look at the extension port of the PropScope. Should be straightforward to run it of a battery and send the data to a bluetooth/wifi/xbee module. Please list what features you want in a simple firmeware demo...
    Hanno
  • kanekane Posts: 11
    edited 2011-02-04 17:20
    > Hanno said:
    > Please list what features you want in a simple firmeware ...

    [ I think we should start a new thread for this topic -- PEK]

    If I could make a tiny bit of progress with my current PropScope on Linux
    (like getting it to talk to me) I would be happy to give you that list.
    I am willing to update the spec.

    Anyway, I hope I do not sound too negative, you guys have made
    a very nice device.


    Pat
    ---
    P.S. the reason I like BT is that I was one of Motorola's reps
    to the BT consortium years ago.
  • kanekane Posts: 11
    edited 2011-02-04 17:31
    Clock Loop wrote: »
    Slap a LIPO battery on the back of it and you have a wireless, FULLY isolated oscilloscope!!!!!!
    (no usb ground loop)
    LIPO:http://www.adafruit.com/index.php?main_page=product_info&cPath=44&products_id=328

    Cool, yeah we would need a good portable power pack. I really want to cut the USB teather.
  • BradCBradC Posts: 2,601
    edited 2011-06-24 06:57
    Hanno wrote: »
    Anyone interested in open source firmware that does something simple? Ie, stream out ch1 and ch2 voltages at a 9600 baud? You could hardcode ac/dc coupling and voltage resolution to keep things simple...
    Hanno

    Rather than do that, could you please spend some time actually completing the protocol documentation that was promised prior to the release of the product?

    Hell, I have some code that samples both channels at 25Mhz and takes 6000 samples, but it triggers a bug in the hardware... yours obviously works, but the "documentation" is an insult.
  • David CarrierDavid Carrier Posts: 294
    edited 2011-06-28 12:29
    Brad,
    What is the hardware bug you are seeing?

    Thank you,
    David Carrier
    Parallax Inc.
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