Connect with us

DAQ full scale range vs. gain vs. resolution?

Discussion in 'General Electronics' started by John Muchow, Aug 24, 2005.

Scroll to continue with content
  1. John Muchow

    John Muchow Guest

    With a DAQ module like the NI USB-6008
    (http://sine.ni.com/nips/cds/view/p/lang/en/nid/14604) or DATAQ DI-158
    (http://www.dataq.com/products/startkit/di158.htm) how does the gain
    setting affect the resolution of the measurement?

    For example, asusme a DAQ has a 10-bit input channel, +/-10V "full
    scale range", and gains of 1,2,4,8, If I set the gain to 1, I should
    then have 1024 steps from -10 to +10 volts, or a resolution of
    0.01953V (20V / 1024 steps).

    Does that mean if I set the gain to 4, I'll have a full-scale range of
    +/-2.5V and a resolution of .00244V (5V / 1024 steps)?

    Or do I always have that same (approx) .020V resolution? I'm pretty
    sure that's not the case, but I wanted to make sure. :)

    Thanks!
    John Muchow
    -- remove SPAMMENOT for e-mail responses --
     
  2. Bob Masta

    Bob Masta Guest

    The gain is applied before the A/D converter, so the result is
    just as you thought.

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  3. John Muchow

    John Muchow Guest

    The gain is applied before the A/D converter, so the result is
    Excellent, thanks!
    John Muchow
    -- remove SPAMMENOT for e-mail responses --
     
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

-