- From: Luis Martinez <luimarma_at_marcosa.e.telefonica.net>
- Date: Mon, 20 Oct 2003 10:57:16 +0200
Hello, El Lunes, 20 de Octubre de 2003 09:09, escribió: > On Saturday 18 October 2003 18:39, Luis Martinez wrote: > > Hello, > > > > I am trying to get analog to digital conversion from a 0V to 10V output > > from a sensor. > > > > Although with a voltage tester the output of the signal is stable (the > > sensor is allways measuring the same for testing), when I read it with > > comedi I have an unstable read. > > Please give us numbers about how unstable it is. It may be normal noise. My system has a resolution of +- 0.25mV while the unstable read I get goes +-150mV and it does not seem to follow a pattern (it does not seem a wave). Also when I read the input with a volt meter I get a variation of only 1mV or total stable read (the resolution of the volt meter is +-1mV. I have used an analog signal conditioner to avoid noises and I have got the same results. Please help. Luis > > > Also if I read another channel that is not > > used (no signal on it) I have a value similar to the one I get on the > > channel of the sensor. > > This is ok. If the other channel is loose, it will get inducted currents > from the used channel. I get similar values in all the other channels of > the board, when they are loose. > Greetings, > Ivan Martinez Luis
Received on 2003-10-20Z07:57:16