# Mathcad question: Please graph (Y1 + Y2 = 1/Zo) over range of Y1 and Y2 .( NOT OT).

Discussion in 'Electronic Design' started by Teece, Feb 20, 2007.

1. ### TeeceGuest

Hi,

I don't know why I am having so much trouble trying to graph this simple
function in Mathcad. It is not Off Topic because, ultimately, I am trying to
graph the solutions to the Thevenin Termination problem (split termination,
if you prefer).

Specifically, if I have two admittances, Y1 and Y2, in parallel, they add. A
termination admittance would result from Y1 + Y2 = 1/Zo. It is easy to plug
in a few numbers and get some values for Y1 and Y2 that satisfy, say Zo=50
Ohms. I am trying to get a graph of the function in Mathcad, as in Y1 vs Y2
for some value of Zo, and for some reason, it is just not coming to me.

I know that there are lots of Mathcad gurus out there that will find this
really easy.

Thank You
Tom

2. ### John PopelishGuest

Graphing generally requires a range variable that produces a
lits of values (as in x:1;10). You can either make the
values to be graphed functions of x or graph a function of x
against the xalues of x, itself.

3. ### Rich WebbGuest

Using your example, define Zo:=50 and then define the function
Y2(x):=(1/Zo)-x. Drop a graph on the page with @ and just fill in the
marker for the left axis with "Y2(x)". Mathcad will give you a default
range for the x-axis but you can change that, as usual, with the axis
limit boxes.

You may, but are not required to, pre-define a range for the independent
variable as in x:=0..10 or x:=0,0.1..10 and so forth. The "y-axis only"
trick works with all functions, built-in and user-defined.

4. ### TeeceGuest

It worked fine.

Regards
Tom

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