Variables for voltage and current on each component (for use in graphically diagramm)

[imaginary]

Hi,

I have a very simple circuit containing only an AC voltage source and two series resistors.

I want do plot the Voltage from the source and of each resistor. I cant find any pre difined variables at present I take the current I und multiplicate it with the value of the resistor.

e.g.

Ur1 = I*r1

 Usource = I*(r1+r2)

thats quite annoying... especially because  setting brackets doesnt work.

probably cause the variables containing brackets itselfes.

hope you have any idea

thx

Message Edited by imaginary on 01-21-2009 10:20 AM

Message Edited by imaginary on 01-21-2009 10:21 AM

[reikira]

Hi Imaginary!

You can use an oscilloscope to measure and plot the voltage (you can find it on the left of the page)

Have a look at the attached picture.

Best regards, 

Serena M.

[imaginary]

thx for your reply.

yes I know that this is possible ...

the problem is that my circuit is more complex. The one with the two resistors was just an example to show the problem.

I would need many oscilloscopes (with their wires) thats confusing and I cant display the graphs in one diagramm to compare phases of voltage and current.

(Im running transient analysis)

At present im using pspice or LT-Spice, Multisim is  more comfortable to use but without these functions its time consuming.

[yyao]

Hi there,

Can you tell us what version of Multisim you are using? What type of analysis are you trying to do? Would it be possible for you to post a Multisim file which demonstrates this problem?

Thanks.

[imaginary]

I'm not sure what you mean ... only the saved ms10. file?

Im using the student edition of NI Multisim 10.1

here is a screenshot from the test circuit

http://www.bilder-hochladen.net/files/9ifr-1-png.html

I expected that I get 3 Voltage values.

V1

R1

R2

Also 3 current values (of course they are all the same in this case, but im used that I can chose the current of each component)

Message Edited by imaginary on 01-22-2009 11:15 AM

[yyao · Accepted solution]

Hi there,

The way you have things set up right now is correct. Multisim, as well as most other circuit simulators, keeps track of node voltages, not voltage drops. When you draw your schematic, Multisim automatically assigns numerical node names to each node. That is why you see V(1) and V(2) and not something like V(R2). To find the voltage drop across R2, you will have to calculate V(2)-V(1). To find out the name of each of your nodes (also called nets), simply do the following:

1. Click on Options>>Sheet Properties
2. For the Net Names option, select Show All
3. Click OK

To make it easier for you, you may want to name some of the nets to something that is more human readable. You can do this by:

1. Double click the net that you want to rename (the net is the wire that you drew connecting the components)
2. Enter your preferred net name in the space provided
3. Click OK

Hope that answered some of your questions.

Message Edited by yyao on 01-22-2009 11:52 AM

[imaginary]

thanks i needed some time to try this hint, but it seems to work.

til now i couldn't  assert any situation in which i couldn't display my voltages and currents 😃

I will let you know if ther is something else