impedance multisim

[kanogui]

Hi, I am trying to get the impedance of the attached circuit. I have tried with several forms that I found in the forum and own ideas but I cannot get it. I tried the following:  a) putting a AC current sourceand simulating the voltage (note I want to note the input impeadnce of the circuit), which teoritically will be the same as the impedance, right? b) I tried to use the impedameter that I found in labview samples but it seems to work only when the elements are in series (am I right? or probably I conencted wrong, first I found out I shouldn't put a ground, so I disconnected it but didn't get the correct answer (I have mi circuit solved by hand and it is 100% correct). c) I kept my voltage source and placed and Iprobe in series with the voltage sourcer and then tried to simulate mag(Vprobre)/mag(Iprobe), which theoretically will give me the impedance, but again I failed. What am I doing wrong?

I would appreciate any help. Thanks!

[OmarIsi]

Hello Kanogui,

Really the Impedance meter must shows the correct answer,what is the result you are expecting?

I share you the results of a simple test, are those results different than yours??? This results come from a sigle frequency AC analysis...

Regards,

[kanogui]

Hi, I cannot see it at all. At a frequency of 100.6584242 MHz, I am expecting to get a impedance with the real part value equal to the resistor, that is, 5 ohms, wich should be the minimum value of the real part of the impedance along all frequencies. 

[Tien_P]

Hi Kanogui,

I noticed started a new thread so I'll post here instead of the other thread that was originally started by someone else.

There is something strange with the file you posted, I can't get it to work either and I don't see anything wrong with it.  I created a new file from scratch using the same values and I am getting correct reading from my circuit. You can run the AC analysis, but using the Single Frequency AC Analysis is better since you are only looking at one specific frequency and not a plot.