- From: Jan Gukelberger <g.u.g.i_at_gmx.de>
- Date: Fri, 02 Dec 2005 15:19:40 +0100
Hi, > When using the 1711 I have a strange problem. I try to read from > two channels like the following lines. [...] > When trying to execute this data_read I get some "bleeding" over > from one channel to the other. In addition, when the signal is just > a few volts neg or positive in relation to aref (which is 0 volts) > the signal gets noisy, more the more apart from zero the signal is. > On the other hand, when just reading from one channel, no noise > exists when the signal is zeri or not. Well, I'm in no ways an expert for sampling hardware but your description exactly meets the symptoms I'd expect to see when the ADC isn't provided enough settling time between channel switches. Try replacing comedi_data_read with comedi_data_read_delayed. HTH, Jan
Received on 2005-12-02Z14:19:40