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Pocket scope

Discussion in 'Electronic Basics' started by Robert Roland, May 26, 2011.

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  1. Sometimes the multimeter just does not provide enough information,
    while the bench scope is too cumbersome to move around.

    I have these cheap pocket scopes around, and I thinking of getting
    one. It seems there are several types and versions about. Does anyone
    have any experience, recommendations or other advice before I buy?

    I have seen two versions from seeedstudio.com, the "DSO Nano" and the
    "DSO Quad". I have also seen some on dealextreme.com, which are
    slightly cheaper, but, judging by the customer comments, can run the
    same firmware.

    Are there any others I should look at?
     
  2. Tom Biasi

    Tom Biasi Guest

    "Robert Roland" wrote in message

    Sometimes the multimeter just does not provide enough information,
    while the bench scope is too cumbersome to move around.

    I have these cheap pocket scopes around, and I thinking of getting
    one. It seems there are several types and versions about. Does anyone
    have any experience, recommendations or other advice before I buy?

    I have seen two versions from seeedstudio.com, the "DSO Nano" and the
    "DSO Quad". I have also seen some on dealextreme.com, which are
    slightly cheaper, but, judging by the customer comments, can run the
    same firmware.

    Are there any others I should look at?
    --
    RoRo

    What is your intended use for the scope?

    Tom
     
  3. Winston

    Winston Guest

    Yes. Don't. :)

    The "DSO Nano" is much too slow and the "DSO Quad" is too delicate,
    (Max 80 Vpp at the probes) has only two analog channels and is nearly
    impossible to purchase.
    <http://www2.tek.com/tekselect/tk_te..._model=US/CANADA&p_product_type=Oscilloscopes,
    Basic&userAction=look&p_model_flex=>

    Have a look at that factory refurb. TDS2012B at $1369. Yum!

    --Winston
     
  4. Winston

    Winston Guest

    Well, that didn't work too well!

    Try this:
    Log to: http://www.tek.com/
    Along the top of the screen click on the sixth tab from
    the left: Purchase > Used Test Equipment.
    Scroll down to the lower left corner and select your
    country. Then in the dialog box titled "Category",
    select 'Oscilloscopes, basic'.

    There you will see a list of available scopes.

    If they work as well as did the old TDS520, they are
    a joy to use and very competent test gear.

    --Winston
     
  5. Hobbyist use. I have a bench scope (with LA) for use in the "lab", so
    the pocket scope will not be the primary scope.

    The idea is that is will fill the gap between the bench scope and the
    multimeter. Here's an example:

    A friend could not get his motorcycle started, and asked me for help.
    I found there was no spark on #1 or #4 cylinders, so I wanted to check
    if the signal to the coils were OK. I had not brought the scope, and
    the multimeter did not give me enough information.
     
  6. I agree with you there.
    With a 10x probe, that should be workable, and two channels is
    certainly much better than one. Although there have been occasions
    where I have wanted more than two channels on my bench scope, it does
    not happen often.
    What do you mean? Is it not simply a matter of clicking "Add to cart",
    and go ahead? They say they have 173 units in stock:
    http://www.seeedstudio.com/depot/pr...tal-storage-oscilloscope-p-736.html?cPath=174
    I already have a bench scope.
     
  7. I am sure it is a fine instrument, but at 16 times the size (volume)
    and 10 times the cost, it is not really an alternative.
     
  8. Sure, but an important point here is the portability. Lugging a PC
    around is even more hassle than carrying the bench scope.
     
  9. Tom Biasi

    Tom Biasi Guest

    "Robert Roland" wrote in message

    Hobbyist use. I have a bench scope (with LA) for use in the "lab", so
    the pocket scope will not be the primary scope.

    The idea is that is will fill the gap between the bench scope and the
    multimeter. Here's an example:

    A friend could not get his motorcycle started, and asked me for help.
    I found there was no spark on #1 or #4 cylinders, so I wanted to check
    if the signal to the coils were OK. I had not brought the scope, and
    the multimeter did not give me enough information.


    I don't like them, way too slow unless they have improved a lot.
    Anyway maybe you will like this one or something else they sell:
    http://www.vellemanusa.com/us/enu/product/view/?id=522380

    Tom
     
  10. Winston

    Winston Guest

    None are on offer with the special connector. Funny that.
    Check the review page.
    You'll see chatter from customers who've paid their money but have *yet*
    to receive their 'scope. Something's afoot, methinks.

    This'd make a *fine* field scope. :)

    --Winston
     
  11. Bob Masta

    Bob Masta Guest

    A laptop is admittedly a lot larger than a "pocket" scope,
    but it has a nice big display, can store lots of data, and
    do other tricks like spectral analysis.

    If you don't need high speed or DC response, you can use the
    built-in sound card. You'll need to rig up your own
    interface circuit if you want to view more than a few volts.
    See "Input Range and Limiter Circuits" at
    <http://www.daqarta.com/dw_0all.htm> for a simple approach.

    You mentioned checking a motorcycle ignition circuit. I've
    used the above approach with a simple "inductive" pickup
    consisting of an alligator clip-lead wrapped around a plug
    wire to measure RPM on a car engine using Daqarta. The
    observed pulse is pretty narrow, so this is not really much
    of a "display" application, but Daqarta can trigger on it to
    feed the built-in frequency counter.
    <http://www.daqarta.com/dw_freq.htm>. It measures
    "instantaneous" RPM by inverting the pulse-to-pulse period,
    so you don't have to wait for a high-resolution result like
    you would from a conventional counter.

    Best regards,





    Bob Masta

    DAQARTA v6.01
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
    Pitch Track, Pitch-to-MIDI
    Science with your sound card!
     
  12. Jamie

    Jamie Guest

    For a cheap one, this works ok ...

    http://www.ageta.hu/download/HDS1022.pdf

    Jamie
     
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