peaks in analog output signal

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 2006-08-23Z06:13:42