Re: Help please, problems reading analog samples

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.

> 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

Received on 2003-10-20Z06:09:21