s626 output voltage at zero crossing

Dear  Gianluca, dear all,

since you are the one, who wrote the comedi-stuff for the sensoray s626
I've did a cc to you directly. Many thanks by the way.

I've managed to get a sensoray s626 card up an running with
rtai-3.2/2.4.27-kernel/scilab/scicos ..., but I encounter a strange
problem.

The output voltage of the DA - converter exhibits a very funny ripple
whenever the output crosses the zero-voltage line.

To me it looks like a step response to a reasonable well damped second
order system. Since the cables are fairly short and no inductance,
capacitance or whatsoever is included in the measurement chain, I was
wondering, if this might be a driver problem .

Hope you know something or you can point me to some solution.

If one asks for it, I'm willing to send some meas. output 

Have fun and thx to all ;)

Nico

Received on 2006-02-14Z09:14:22