Transcript How to Run Multisim

It’s always important that all of your nodes be numbered.
So the way to do that is to go to Options at the top of the
screen then select Preferences. When you open the
preferences you’ll see the check boxes on the top half,
Check the box: Show node Names, then OK
DC Operating Point
Once you have your circuit you’ll want to simulate it.
The way that could be done is to go to the Simulate
menu, Analysis then DC Operating Point.
The point of the DC operating point to measure the
currents and voltages through out the circuit.
Notice that all the node numbers and current branches are in the
left list. You can select which items you want analyzed by
selecting it and moving it over to the right side list by highlighting it
and pressing the button in the middle marked Plot During
Simulation.
You should get a box with readings in it saying at which
nodes the voltages are as follows. And something must be
understood about the current readings. In this case it’s the
reading vv1# branch. That reading is always the current
flowing into the positive side of the V1.
Modifying the Circuit
B
A
It’s also important to be able to modify the circuit when you have to. In this case lets change the resistor
value. You double click on the resistor and a window will show up. There are four tabs: Label, Display,
Value and Fault. The Value tab is the one where you are able to change the resistance level (arrow A). It is
also possible to change the tolerance level and even the temperature of the resistor but that won’t be the
point of this lab. You can also press Replace next to okay and it will give you the list of preset resistors to
replace it with. There is also the box (Arrow B) that allows to change the units from picohms to terraohms.
There is also the label tab, and what that does is allow you to change the Resistor number or what you want
to be shown or if you want you could add in an extra label to it. The graph below is to be able to write the
label and value in a more organized way on the schematic but isn’t necessary.
The Fault tab is meant to set faults within in the component, such as short circuits, open
circuits, or leakage. But using this won’t be needed.
Potentiometer
Capacitor
inductor
transformers
To add components is simple, just go to the list of components and choose
something you would like to include in the circuit. You can make any circuit you
want to, but the only thing that you need to know would be how to set it up in
terms of output and input terminals and making sure that it flows with the circuit
or else you get an error symbol when you try to run a simulation.
Transient Analysis
AC power supply
To do Transient Analysis, the first thing you need to do is to change your power supply to a AC type power
supply. If you were to use a DC type your graph would just be a straight line because transient analysis
measures the change of voltage with respect to time and in DC there is no change, it’s a constant voltage.
A
B
C
A window will appear and it will talk about setting the parameters. It’ll already have preset times and
numbers and you stick with them to see how it looks after you simulate it. If you do want to change it
then you could begin using the start and stop time (Arrow A). You could make the stop time smaller and
that would enlarge the picture you have of the current.
You could also change the number of points to make your curve. Right now it’s already preset (Arrow C)
for a hundred points or you could increase it or decrease it (Arrow B).
A
Now before you can simulate it, you still have to plot the output variables. So click on the Output
Variables tab. Highlight the variables that you want simulated and then press the Plot During
Simulation button. After it shows up on the other list then you can simulate the circuit.