At 03:59 PM 7/03/97 +0100, you wrote:
>At 00:57 08.03.97 +1100, you wrote:
>>I wish to use a pic to determine a signal which has a resolution of 10
>>microvolts in 200 millivolts. It also has a requirement for any component to
>
>Perhaps, it would be easier, to have corrections on the analog
>side of the system.
>Do the two signals (10 microV  vs.  200 mV) have different frequencies? Try
>to filter them with an appropriate high-pass / low-pass including
>amplification.
>Then an 8-bit ADC may be sufficient.
>
>regards,
>
>Wolfram
>
>
>+-----------------------------------------------------+
>| Wolfram Liebchen                                    |
>| Forschungsinstitut fŸr Optik, TŸbingen, Deutschland |
>| mailto:liebchen@ffo.fgan.de                         |
>+-----------------------------------------------------+
>

Wolfram,

Thanks for the suggestion. I am not sure what you mean. However, I would
like to have as few components as possible as I am trying to fit a pH probe,
conductivity probe and temperature sensor along with electronics, cable, etc
in a tube 12mm diameter and 300mm long. 

The reason for the low resolution is the conductivity in a high pH environment.

Thanks again,

Peter 
Neosystems