> =A0 =A0 =A0 =A0 =A0 =A0 =A0I constructed a PIC ORP(Oxidation Reduction Po=
tential) interface using the help of Mr.Marcel Du Champ from this list. I a=
m facing a problem with signal noise. The LCD display is showing a value cl=
ose to 200mV when I dip it in a solution of potential of 200mV (say 203 to =
207mV). When I remove my probe out of the solution, I see that my display i=
s indicating all possible values between 0 and 900mV before returning to 0m=
V.
/>

Have you looked at the signals with an oscilloscope?

If you short cicruit the prpobe cvonnections at the probe does the
display still read randomly?

If you short circuit the probe connections at the connection to your
circuit what does the display do?

If you arrange for a fixed known voltage into the PIV what happens?

What is the probe impedance / resistance?
Do yuou have  acapacitor connected across the probe terminals.

Seeing your circuit would be REALLY useful.

You need to keep any circuit ssent to well under 40 kB to be sure they
dont get discarded. On a website as PDF / JPG / GIF / PNG / ... is
usally better.

If you have no website access, if you email it to me I will put it on
a  website for you.


      R







I don't want my probe to pick up noises from the environment. It is
also displaying some junk characters before returning to zero. How am
I supposed to eliminate such erratic behavior?
>
> I am planning to actuate a relay using the displayed voltage. I am worrie=
d whether any devices would be actuated due to such erratic behavior.
>
>
> Sairam
>
>
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

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