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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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