Connect with us

Instrument with analog output, cheap and on RS232/USB

Discussion in 'Electronic Design' started by Klaus Kragelund, Nov 3, 2012.

  1. Hi

    For a test setup I often need an analog signal to feed into the device under test.

    So I need a instrument with an anlog output. It needs to run on RS232 or USB

    I could roll my own, with a eval board, but have no time to spend on that

    Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive)

    Thanks

    Klaus
     
  2. Rich Webb

    Rich Webb Guest

    Bandwidth? Memory depth? Resolution? Sync trigger?

    This http://www.circuitspecialists.com/dds-3005usb.html might do the job
    and it's fairly inexpensive.
     
  3. Have you looked at Measurement Computing? They are inexpensive, less
    than NI.
    <http://www.mccdaq.com/solutions/USB-Data-Acquisition.aspx>

    Cheers
     
  4. rickman

    rickman Guest

    I assume a standard USB stereo audio adapter for the PC won't work?

    Rick
     
  5. Nico Coesel

    Nico Coesel Guest

    You can use a cheap PLC like this:
    http://www.xlogic-plc.com/

    or a programmable power supply like this:
    http://www.ebay.com/itm/261050328132
     
  6. I bought this 30V/5A one for USD $99 (£61) including shipping with
    (isolated) USB and RS-232 interfaces. Seems to be unavailable from
    that source atm. I think it's okay Chinese quality, but probably rated
    a bit "optimistically" according to DJ's vblog. No NA safety
    approvals. It's a kind of spare for when the 3-output Rigol is being
    used or maybe for risky types of loads.

    http://www.amazon.com/gp/product/B0085QLNFM/ref=oh_details_o03_s00_i00

    Speaking of Rigol, if you want more like a signal, these units are a
    bargain, in a different class quality and design-wise. They have an
    Ethernet interface (inherently isolated), and two signal generators,
    so you can generate a 50MHz sine wave frequency modulated with a 1MHz
    triangle wave if that's what you want.

    http://www.rigolna.com/products/waveform-generators/dg4062/

    They have higher frequency units, but the price goes up quickly for
    the additional capability.


    Best regards,
    Spehro Pefhany
     
  7. That's not bad. I was talking to a physics prof. (UC Davis?) who
    had an experiment where he put together different lengths of 50 and 75
    ohm
    cable, making variable wavelength 'sturctures'.
    And drove it with a ~50MHz. generator.

    George H.
     
  8. Joerg

    Joerg Guest

    This is the one I use for that purpose:

    http://labjack.com/u3

    That way you have it in a sturdy plastic housing. Comes with the lite
    version of DAQFActory which is quite useful. I really like it. Well,
    except for that blood-red color.

    This device is also handy for niftier test setups. For example "I want
    this line to switch to 3V tomorrow at 10:16am but only if there is
    enough daylight, and then gradually ramp down to 0V until evening".
     
  9. Thats a nice device and in the right pricerange, thanks :)

    Regards

    Klaus
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-