Homework Help: Positive slope instead of negative

1. Nov 10, 2014

MMS

Not sure if this is the right section but I believe it'll be moved if not. :)

Anyway, in my physics laboratory, we build an RC parallel circuit. we measured some things here and there that would help us draw the tan of the phase φ as a function of the frequency. The problem is, instead of receiving a linear line with a negative slope as we would expect by the relation tan(φ)=-ωRC, we get a positive one.
We (me and my partner) tried to work out what was wrong and didn't really get too far with it. The only thing that came across our minds is that there is something related to the connection of the wires in the circuit that would determine the phase.
Not sure if that's wrong or right and it doesn't really satisfy me since we didn't give a too much of a physical explanation as to why is that but that's why I'm here. :p

I hope you guys can help me out with it.

Thank you!

2. Nov 10, 2014

BvU

A matter of tracking back what was here and what was there.
Is it clear what the $\phi$ in $\tan\phi = -\omega\; RC$ stands for ?