Re: zeros on analog input with NI Daqcard 6036E

From: Bob Estes <estes_at_transmeta.com> · Date: Sun, 30 Nov 2003 00:53:07 -0800 (PST)

Did you see the program I included in a previous email (4 or 5 days ago)?
I'm very new to the comedi stuff, but have been able to sample near the
maximum rate supported by the card with this program (it was derived from
the mmap demo).  I know I've done at least 150k samples/second.

You do have to redirect the output to a file, though, probably cause the
program can't keep up with the screen output.

-B

> sorry for bringing this up again, but I am desperately trying to 
> understand why my national instruments daqcard 6036E cannot sample 
> anything close to the rate possible under windows. At the moment 
> sampling all 16 channels with 1 kHz results in a mixture of sensible 
> data and zeros. We have tested with a sine wave and the card really 
> loses the data at these points.
> The computer is fast (almost 3 GHz) and has 512 MB Ram, so that 
> shouldn't be a problem. I installed comedi end of october, has anything 
> changed significantly since then? I am running debian, kernel 2.4.22.
> PLEASE, I don't know what to do - any help will be greatly appreciated!!
> 
> Miriam
> -- 
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> Miriam Fend, PhD student		      Tel + 41 - 1 - 635 45 80
> Artificial Intelligence Laboratory            Fax + 41 - 1 - 635 45 07
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