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Introduction to ORCAD(EBN 122 : Electricity and Electronics)
Pre-Practicum 1
By Bongani Mabuza 17 July 2009
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EBN 122: Practical 1Objectives
Familiarize students with Orcad
Execute circuit simulation in Orcad
Complete Practicum Assessment
Practical 1 will take place during the weekof 27-31 July (check web updates)
Group allocations will be posted on thewebsite
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EBN 122: Practical 1Orcad
Schematic Capture and circuit Simulation are two
essential tools in computer aided circuit analysis anddesign
Computer aided design makes it possible to deal withproblems which are computationally very complex and
lengthy without the aid of a computer
Simulation software is part of mordern engineeringpractice
This practicum provides an opportunity to gain someskills in using these tools, which are used in manysubsequent modules
2
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EBN 122: Practical 1Orcad
What is schematic
Capture?
Schematic Capture is anelectronic means of
graphically constructinga circuit in a format thatcan be subsequentlyread by software suchas PSpice for circuitsimulation and by OrcadLayout for circuit boardlayout
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EBN 122: Practical 1Orcad
What is SPICE and
what is PSice
SPICE was originally
an analogue circuitsimulator softwarepackage that wasdeveloped at the
University of Californiaat Berkeley
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EBN 122: Practical 1Orcad
How does PSpice help in
circuit analysis anddesign?
PSpices strong point isthat it helps the usersimulate and analysethe circuit designgraphically on thecomputer withouthaving to build aphysical circuit
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EBN 122: Practical 1Preparation
Read through the PSpice Appendix D at the
back of your prescribed textbook
Complete the prescribed questions before the
practical
You will be required to complete a pre-practical
assignment before you commence with yourpractical
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EBN 122: Practical 1Practicum requirements
What is required in order to complete the practical?
Understand and be capable of creating circuit schematics inOrcad Capture
Understand and complete bias point simulations
Understand and complete DC sweep simulations
Understand and complete Parameter Sweep simulations
Complete the pre-practicum
Complete the online assessment questions on/before theday of the practical
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EBN 122: Practical 1Launching Orcad
Open start menu
Go to Programs
Launch the Orcad
Capture CIS program
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EBN 122: Practical 1Orcad Creating a new project
How to create a new project?
Choose new project from the file menu of OrcadCapture
Make sure the project is using Mixed analogue and
AD, otherwise your project will not simulate
Name the project as follows: S-studentno-PRAC1,e.g. S24242424PRAC1
Choose as the location for your project the driveD and the directory EBN111Results. If thedirectory doesnt exist, create it
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EBN 122: Practical 1Demonstration of different simulations
A demonstration of how to complete the different
types of simulations (in class)
This work is also covered in your textbook appendix
You may download the demonstration software fromthe EBN 122 website for working at home, thesoftware is available in any of the engineeringcomputing laboratories
All Practicum's are completed in groups of two (2)
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EBN 122: Practical 1Pre-Practicum Questions
Pre-Practicum questions are to be completed before
the practical
Consider the figure below
The battery has internal resistance of 1
R2 is the load resistance, R2 must be variedsequentially from 1 10
12 V
Rint
R2
0
Battery
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EBN 122: Practical 1Pre-Practicum Questions
Complete a bias point calculation of the circuit for R2= 1 Determine the current through R2 Determine the voltage across R2
Sequentially set the value of R2 to five values in the
range 1 - 10 Determine the load voltage (V2) across R2 and the
current for each resistor value
Sweep the battery potential from 1 to 12 V in 1 Vincreaments Determine the current through R2 for every
increament
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EBN 122: Practical 1Pre-Practicum Questions
You will complete the pre-practicum
assignment before you commence withyour practical on the day of the practical
The assignment will be downloaded in .pdf
format from EBN 122 website and submittedonline
The pre-practicum is to be completedindividually
To be submitted online before you start yourpractical
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EBN 122: Practical 1Pre-Practicum Questions
Plagiarism warning !!!
The online pre-practicum is completed in a .pdfformat that is downloadable from EBN website
This document contains both unique watermarkand serial number
Any copy of the same document for differentstudents will be investigated immediately
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EBN 122: Practical 1Practical Assessment - Online
The practical assessment willbe carried out by completing
an online assessment form
To launch the onlineassessment open (doubleclick) the program on thedesktop
Online practical assessment
Launch the program Fill in your details: Name,
Surname, Student no. Select the practical will be
completing Login
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EBN 122: Practical 1Practical Assessment - Online
Once you have completed the practical,submit the practical
Your mark will be shown to you and emailed toyour student account
Practical assessment breakdown
Pre-Practicum: 50 %
Practical: 50 %
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EBN 122: Practical 1
Conclusion - Enjoy
Contact details for Questions or Feedback
Email: bongani.mabuza@up.ac.za NB: For all emails use the subject [EBN122]
Office no.: Eng 1, 15-18
Tell no.: 012 420 5917 (only when necessary, only!)
During practical
There will be two Demis to assist you during thewhole duration of the practical
Ask questions and remember you can also refer tothe practical guide or materials available on themodule website