# Thread: How to calculate effect of 1 of 2 inputs while compensating for 2nd input?

1. ## How to calculate effect of 1 of 2 inputs while compensating for 2nd input?

Hmm, I'm not even sure what topic this falls under.

So I was evaluating an electrochemical process with respect to changing temperature. A voltage goes in, a slightly different voltage goes out. I want to figure out how much the temperature affects the output.

The problem is there was a slight drifting of the input voltage. So how do I cancel out the effects of the input voltage to figure out how temp affected the output?

Input & Output voltages as well as temp were logged and they are all lined up in a spreadsheet.

I'm sure it's easy I just can't put my finger on it.

Thanks for any help you can supply!

2. Sorry I didnt read your posting carefully. You might consider finding the effective resistance of your system. Unfortunately Ohm's Law gets violated so often that it shouldnt be called a law. Also you could only do this if you knew the resistance of all the other components in the system. Did you have a current limiting resistor in series with which to compare it? It sounds like you are trying to measure resistivity?

3. What I think I need to do is normalize the V(out) for the changes in V(in). Then once that variable is cleared/compensated for, I can find the effect of the temperature changes.

I'm just having a snag normalizing (if that's the right term)?
I think it is just a math only problem at this point, the problem could just as easy refer to weights or volumes vs. temp.

There really are no other items, just the power supply and the 2 channel voltage recorder and the temperature logger.

Thanks again!