Re: peaks in analog output signal

yes, I swaped the signals, but the problem arises on the same output (D/A 0). Further investigations show that I also have little peaks on the second output, but just about +-0.05 V, while on the first output the peaks are almost +-0.2 V.

-------- Original-Nachricht --------
Datum: Wed, 23 Aug 2006 08:54:26 -0400
Von: Mario Behn <behn_at_mirsl.ecs.umass.edu>
An: "\\"Johannes" Schröck" <johannes.schroeck_at_gmx.at>
Betreff: Re: peaks in analog output signal

> Hi Johannes,
> 
> have you tried to swap the signals?
> 
> -- Mario 
> On Wed, 2006-08-23 at 09:13 +0200, "Johannes Schröck" wrote:
> > I use a PCI-DAS1200 board from Measurement Computing and I have a big
> trouble with analog output. This board provides two analog outputs. While the
> second output works fine (D/A 1), the signal generated by the first output
> (D/A 0) shows very disturbing peaks in the signal. The time distance
> between two peaks is equal to the sample rate. If I change the sample rate also
> the time distance between the peaks changes in the same manner. I really
> tried a lot to clarify this behaviour, but now I am on a point a don't know
> what to do any more. This peaks affect measurement very hard. While the
> signal from D/A 1 is quite smooth the signal from D/A 0 looks very noisy.
> > 
> > Does anybody observe similar behaviour befor? Is it possible, that this
> is a software problem? Or is this behaviour definitly a hardware problem of
> the board?
> > 
> > I use rtai 3.2, comedi 0.7.72, comedilib 0.7.22.
> > 
> > Thanks for any help, Johannes
> > 
> > 

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Received on 2006-08-23Z13:16:56