PSpice Lab Report

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```					 University of Southern Mississippi

EET 110 Introductory Circuit Analysis

PSpice Exploration Lab

Lab Instructor: Dan Garcia

Date Performed: 2/9/06
Date Submitted: 2/16/06
Submitted by: Chris Mills
Abstract
In this lab the student explored the PSpice program downloaded from the internet
per university request. The program was explored by drawing a simple series circuit and
a more complex parallel circuit, and using the software to give voltages and currents for
certain points on the circuits. In addition to this, the student created a tutorial for working
through drafting the circuits in the lab using the program.

Introduction
Many times engineers take up valuable time in the industry trying to evaluate
different calculations for a specific circuit by hand. By becoming familiar with the PSpice
software, students are learning how to make mock circuits and evaluate them using the
program, which takes much less time and cost less than making a mistake on a job.
Before complex circuits are drawn and evaluated using the program, students must first
learn to evaluate simple circuits to both become familiar with the program and test their
skills before applying them to more complex jobs.

Materials
Acer 3003WLCi Laptop
PSpice 9.1 Student Version

Methods
The student first used PSpice to draw a simple series circuit consisting of two
resistors (wire resistance and load) and a power source.
The student then used PSpice to draw a parallel circuit of three different parallel
resistors, a wire resistance and a power source.
Finally, the student compiled a short tutorial on how to draft these two different
schematics.

Results
The student arranged the pieces to the series circuit and evaluated the voltage and
resistance, given that each resistor is 1kΩ and the power source supplies 1.5 V.

The results of the schematic are printed in the colored boxes, green is the voltage
at the given point, blue is for the current.

The student then drafted a schematic for a parallel circuit given the same
specifications:
The color code for this draft is the same as the series circuit. The schematic
printouts from the program are appended to the end of this lab report along with a
printout of the tutorial drafted as part 3 of the lab.

Conclusions
Based on the laboratory it can be seen that PSpice is a very powerful program and
familiarity with it is pivotal in industry and can save an engineer or technician money and
time.
The two different types of circuits drafted in this lab shows the versatility of the
program on a small scale, and by creating a tutorial for the program the student was able
to more clearly understand the inner workings of the program and how to instruct another
student on the programs controls.
Appendix A

PSpice Tutorial
Chris Mills
University of Southern Mississippi

Drafting a simple series circuit-
1) Open PSpice from Start  all programs  Pspice  Schematics
2) Open a new schematic page using the new project button

3) A grid of blue dots will appear, this grid is the medium on which the pieces to the
circuit will be assembled.
4) For this circuit you will need 3 main components and wiring, first of all lets get
all of these parts:
a. Voltage source
b. Resistors (2)
c. Earth ground
5) To get the components, select draw off of the toolbar at the top, then select “get
new part…”
6) A screen will appear that will allow you to search for each part, locate the part in
the window and select place part. On the last component choose to place the part
and close the window.

7) All of the parts lined up on the board will look like this:

Shorthand names in the window for the parts needed are:
Resistor = r
Voltage Source = VDC
Earth Ground = GND_EARTH

8) Now to arrange the components to form a generic series circuit. This entails a
voltage supply at the left, a resistor at the top, a resistor at the left, and the earth
ground at the bottom corner. These positions are only suggestions and can be
substituted with arbitrary placements; however, the earth ground should be placed
near the negative terminal of the voltage supply so that the measurements are not
skewed.

Note: to rotate a part press Ctrl+r while the part is highlighted in red

9) Now to draw the wire, select the pencil from the toolbar and click at the positive
end of the voltage source, connect the components but make sure not to intersect
the components with wire.

Notice the only blue dot appears where the earth ground is connected, other dots will
cause an error when the simulation is compiled

10) All that is left now is to simulate the circuit, to do this select the simulate button
from the toolbar

11) The simulation should look like this:

All of the outputs are zero because this is a sample, but to change this right click on
the component you wish to alter and change the properties. The value of the voltage
source can be changed to 1.5V and this circuit will simulate Mr. Garcia’s lab
experiment:
After selecting “ok” on this menu, the output for the circuit is:

Drafting a parallel circuit –
1) Open the program and create a new page as shown earlier
2) Get four resistors, a voltage source and an earth ground and make this
arrangement:

3) Change the value of the voltage source to 1.5V as shown previously
4) Connect the components with wire being conscious to only have five blue dots on
the schematic.
5) Press the simulation button and the result should look like this:
******Side Notes******

1) To add a name to the project, select the textbox tool from the toolbar:

Drag the tool to create a box and use the cursor in the box to type the
required name as in a word processor

2) With the default settings of the program, sometimes things that appear on the screen do
not appear on a printout of the schematic. If this happens take the followings steps to
alleviate the problem:

1. Select Options  Display Preferences…

2. The following screen will appear:
The left-hand frame
lists all of the attributes
that can be displayed on
the screen; the main
two are listed as
Simulation Currents
and Simulation
Voltages. Select these
off of the menu and
select both the display
and print checkboxes on
the right frame. The
colors of the displayed
attributes can also be
changed to make them
more prominent on the
schematic printout.

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