Breakdown voltage of parallel capacitor.

Hi there.

I am designing a simulation of the breakdown voltage of a parallel capacitor. So what I'm trying to figure out is, how the easiest way to to this is. For starters I guess it could be interesting to plot an I-V curve for the current between the two plates and then see where the current spikes. However, I am quite new at Comsol and I'm at a loss at how to make such a plot. I've designed the geometry and so forth, but how would I design the plot?

Anything helps.

Thank you

Tore.