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Instrument with analog output, cheap and on RS232/USB

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

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  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)


  2. Rich Webb

    Rich Webb Guest

    Bandwidth? Memory depth? Resolution? Sync trigger?

    This might do the job
    and it's fairly inexpensive.
  3. Have you looked at Measurement Computing? They are inexpensive, less
    than NI.

  4. rickman

    rickman Guest

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

  5. Nico Coesel

    Nico Coesel Guest

    You can use a cheap PLC like this:

    or a programmable power supply like this:
  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.

    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.

    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
    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:

    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 :)


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