- From: Naoko Kurahashi <naokok_at_stanford.edu>
- Date: Fri, 27 Aug 2004 18:32:45 -0700
Hi, I'm no pro at this, but I've been doing some noise study myself so maybe I can shed some light. What range are you set on? I think the default for the demo is range=1. what voltage range does that correspond to for your card? I looked up your card on ni.com and it seems like it's 24bits. so a few hundred over 2^24 is not much fluctuation, even if you were set for +/-10V. My NI card is setup in an office room and I still get mV fluctuations all the time, even when I properly terminate my input. Naoko > comedi version 0.7.68.1 > > > driver name: ni_pcimio.c > > > board name: NI pci-6014 > > > > > > Is it normal for an analog input to increment, even when no input is > applied? > > Using the inp.c demo from the comedlib shows the weirdness. > > > > > > if i reset it... > > > #/usr/local/bin/comedi_calibrate --reset > > > > > > this is what i get. > > > > > > demo # ./inp > > > 40515 > > > demo # ./inp > > > 40554 > > > demo # ./inp > > > 40586 > > > demo # ./inp > > > 40614 > > > demo # ./inp > > > 40644 > > > demo # ./inp > > > 40672 > > > demo # ./inp > > > 40707 > > > demo # ./inp > > > 40738 > > > > > > > all of the other functions (analog out, digital io) seem to work. > > > is there something i am missing? > > > > > > thanks. > > > > -- > "No government has the right to decide on the truth of scientific > principles" - Richard P. Feynman (May 11, 1918 - February 15, 1988) > > _______________________________________________ > comedi mailing list > comedi_at_comedi.org > https://cvs.comedi.org/cgi-bin/mailman/listinfo/comedi >
Received on 2004-08-28Z00:32:45