Its always important that all of your nodes be numbered.

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Its 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
youll see the check boxes on the top half, Check
the box Show node Names, then OK
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DC Operating Point
Once you have your circuit youll want to
simulate it. The way that could be done is to
go to the Simulatemenu, Analysis then DC
Operating Point. The point of the DC operating
point to measure the currents and voltages
through out the circuit.
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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.
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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 its the reading vv1
branch. That reading is always the current
flowing into the positive side of the V1.
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Modifying the Circuit
B
A
Its 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 wont 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.
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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
isnt necessary.
The Fault tab is meant to set faults within in
the component, such as short circuits, open
circuits, or leakage. But using this wont be
needed.
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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.
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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, its a constant voltage.
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A
B
C
A window will appear and it will talk about
setting the parameters. Itll 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 its already preset (Arrow
C) for a hundred points or you could increase it
or decrease it (Arrow B).
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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.
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