Converting Amplitude & Phase OR Real & Imaginary to r & jx for Smith Chart

[Chazzzmd]

Greetings,

Right now my standard data files include amplitude & phase, real & imaginary (seperate columns). I'm trying to figure out how to plot on a smith chart. I've looked at the example "Smith.vi" in labview and like the look and feel, but the numbers are just randomly generated for the values of r & x.

Is there a calculation I can use on the above mentioned numbers to result in the correct r & x values for the smith chart?

Thanks in advance for any help. I'm still a beginner with Labview.

-Chazzzmd

[Devin_K]

Chazzzmd,

I believe that the r and x inputs for the Smith plot are the real and imaginary components or your data, so you shouldn't need to do any calculation.  In other words, the plot is looking for data in the form "r + jx".  Just use the real components for r and the imaginary components for x.

[Chazzzmd]

Devin,

Thanks for the info. I know it's been awhile, but you know how it is getting caught up with additional stuff. I've since been able to get the smith chart working but found out something in the process.

The Smith Plot.VI is looking for resistance and reactance values (Z=r+jx).  Where r =resistance and x=reactance (j=imaginary). Once I took these values instead of straight real and imaginary the plot is now working correctly.

Just thought you might want to know. In addition, I'm still looking for the algorhythms to convert real and imaginary to r & x respectively.

Thanks again,

-Chazzzmd