# Discussion Forum

## Measure voltage difference between 2 points on model

 Topics: 4.2
RSS feed   |   Turn on email notifications   |   2 Replies   Last post: October 9, 2012 6:48pm UTC

Vijay Ramakrishnan

October 9, 2012 7:57am UTC

Measure voltage difference between 2 points on model

Dear Sir,
I want to know if there is any way i can insert a voltage probe or electrodes in my comsol model, to measure the voltage difference between two points in the model.
Vijay

John Schmidt

October 9, 2012 5:25pm UTC in response to Vijay Ramakrishnan

Re: Measure voltage difference between 2 points on model

Vijay,

I believe all you have to do is (say you are in a 2D model) add two Domain Point Probes (right click on Definitions under [FileName] > Model(#) > Definitions). In one Point Prove Expression, set it equal to V; in the other, set the expression equal to V - mod1.ppb1 (or whatever the probe is). Then you can plot mod1.ppb2 as a function of whatever you like. I believe that this will get you what you want. There may be other ways to do this using a line, and then finding the potential distribution along that line. There is a very detailed explanation of this in the help documents as well.

Good luck,
John

Ivar Kjelberg

October 9, 2012 6:48pm UTC in response to John Schmidt

Re: Measure voltage difference between 2 points on model

Hi John

As you say, its better to use a boundary than a 2nd order (down) entity (as a point or edge in 3D), as you might have singularities on calulating flux around a singe point/vertex/edge

--
Good luck
Ivar

Rules and guidelines