MAE 170

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MAE 170
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MAE 170 - PURPOSE OF COURSE

• To acquire knowledge and confidence in the
  art of scientific
• measurements (temperature, pressure,
  strain, acceleration)
• through an exposure to sensors and signal
  conditioning

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Syllabus What will we cover?

• Instrumentation
• Data collection (using LabviewTM 8)
• Analysis
• Error analysis
• Report writing

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BOOKS/OTHER MATERIAL

• Introduction to Engineering Experimentation,
• Authors Anthony Wheeler and Ahmad Ganji
• Publisher Pearson (Prentice Hall)
• You will have access to all the information you
  need
• for Labview VIs (www.ni.com)
• Lectures on Website mae170.ucsd.edu
• In addition, books on circuit theory, engineering
  we expect you to solve problems you run into!

GET A CARBON-COPY LAB NOTEBOOK!
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WHY MAE 170 is RELEVANT
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INSTRUCTIONAL TEAM

COURSE INSTRUCTORS Prof. Farhat Beg
Prof.
Joanna McKittrick 471 EBU-II
257
EBU-II 858-822-1266 (fbeg_at_ucsd.edu)
858-534-5425 (jmckittrick_at_ucsd.edu
)
Laboratory Technical Staff Mike Watson
Nick Busan
104 EBU-II
104 EBU-II
858-534-7357 (mwatson_at_ucsd.edu)
858-534-9585 (nbusan_at_ucsd.edu)
One graduate TA for each lab Dan Arnold Dan
Zemler Krys Murano Jenny Hsiung Jin Yeal
(Eric) Kim Jordan/Dan Z are also our local
LabviewTM expert
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LABORATORY/ LECTURE SCHEDULE
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COURSE GRADING

• Assignments and Grading
• Lab / weekly grades (8 labs x 9 72)
• - Lab quiz 30
• - Laboratory notebook / continuous
  assessment 20
• - Written report 40 (First and second
  assignments - 20)
• - Labview VIs 10
• Mid-term exam (8) Oct. 23 (during lecture)
• Final examination (10 written, 10 in-laboratory)

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COURSE MECHANICS

• First line of defense generally the TAs ? come
  visit during the 2nd half
• of any lab period
• Administrative or grading questions, please
  contact Prof. Beg
• Prof. McKittrick office hours 300 440
  Mondays, Prof. Beg office
• hours during lab sessions.
• Contact the faculty who gave the lecture
  that week about lab questions
• Please put MAE 170 in the subject for all
  e-mail communications
• Instructions for lab sessions will be posted
  on class web page in advance
• The lectures will be posted before the start
  of lab sessions

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COURSE MECHANICS WHAT TO EXPECT?

• This is a class of over 300 people. We have firm
  rules about class conduct
• No make-ups of quizzes, exams, or labs without
  ADVANCE authorization
• Lab reports back within two weeks of submission
  (first report back within first week) grading
  questions within 1 week of return
• Please submit an electronic and paper versions of
  report
• Reports due within 10 minutes of lab start time,
  or may be considered late (BE ON TIME)
• There may be surprise quizzes in lectures

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LabView VIs

• Preparation of Labview VIs to acquire data using
  a PC and data acquisition card
• You will be entitled to use Labview in EBU-II
  computer labs
• There will be special Labview office hours
  weekly, special part of lecture each week
• NO E-MAILING Labview VIs to TAs / instructors
  for assistance

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LabView 7 for Data Acquisition

• Graphical programming language, easy to learn
• Uses the concept of a virtual instrument (VI)
• VIs replace traditional measuring instruments
  such as
• multimeters, oscilloscopes etc.,
• External signal (temperature, pressure, voltage
  )
• Conditioning (Data Acquisition-DAQ Board)
• Analog to Digital conversion (DAQ board)
• Representation on a computer

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LABORATORY QUIZ

• Every week, at the start of lab session, you will
  be given at least 10 question to answer
• You may need to give explanation about your
  answers
• Please make sure that you ask your TAs about the
  points
• the following week

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LABORATORY REPORTS

• Documentation is an IMORTANT aspect of any
  engineering experimental program.
• Lab reports must be neatly prepared using a word
  processor and must be attached by STAPLES no
  handwritten lab reports, no paper clips are
  acceptable.
• The names of the people in the group and their
  lab section / time must be clearly indicated on
  the report.
• Each person (not each group) will be required to
  have their own lab notebook with carbon copies,
  and staple the copies from their book to the back
  of their reports as an Appendix.

Please get note books with carbon copies
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LABORATORY REPORTS

• For data taken electronically, make notes about
  the experimental condition, filename, etc.
  Graphs should be taped or stapled into lab books.
  
• The procedure of each session will be posted on
  the class web page. You must read it before
  coming to the class.
• Your TA will come by to check each persons
  understanding and to check each notebook to make
  sure that your lab book includes all of the
  proper preparation and subsequent data.
• We expect every group member to put substantial
  effort in the report. Any complaints from other
  group members will result in individual report.

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MORE ON LABORATORY REPORTS

• We will provide you sample reports.
• We will give you comments on each report.
• Report formats and expectations will be covered
  in Lecture 2, as will the class expectations on
  error analysis.
• Please also read Appendix A in your textbook
  (assigned reading for week 2).
• We have deliberately reduced the percentage of
  the grade for the first 2 reports while you get
  the hang of lab reports.

WE ARE HERE TO HELP YOU
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SAFETY RULES

• At the beginning of each lab Mike, Nick, or the
  TA will give you a reminder of what you are to
  accomplish in the lab and an overview of safety
  issues.
• This lab is inherently safe, but experiments can
  always be made unsafe through improper adherence
  to safety rules.
• It is your responsibility to take common sense
  precautions and to be careful in the lab.
• If you ever feel that there may be a safety issue
  (with yourself or another group) while you are in
  the lab, DO NOT CONTINUE TELL MIKE, NICK, or
  the TA immediately and your concern will be
  addressed. We expect that by working together,
  the next many thousands of students can complete
  this lab course without any mishaps.

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LASER SAFETY

• We have a laser experiment, for this you are
  required to watch a laser safety video
• NEVER STARE INTO THE LASER
• DO NOT POINT THE LASER TOWARDS OTHERS
• Always confine yourself to the area designated
  for the laser experiment
• If you have concerns, please immediately talk to
  Mike, Nick, or the TA

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ACADEMIC INTEGRITY

• University of California policies on Academic
  Integrity will be strictly enforced. Please talk
  with the instructors if you have any questions or
  observe any questionable behavior. Details on the
  University policies may be found on the web.
• You MUST read the official campus policy
• http//www-senate.ucsd.edu/manual/appendices/app2.
  htmAP14
• Please speak with the instructor if you have any
  questions.    

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MORE ACADEMIC INTEGRITY

• An important part of our mission is to maintain
  integrity in the learning experience and we
  enforce a zero tolerance policy towards academic
  dishonesty.
• Each instructor will provide clear guidelines
  concerning the use of published materials and
  student collaborations at the start of each
  course, and the penalties for violation of these
  guidelines. These penalties will be enforced
  without exception.
• This quarter we are asking you to submit lab
  reports electronically
• (in addition to paper copy). Reports will be
  compared with previous reports.

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Questions that we will learn to answer

• How are measurements made?
• What effect causes the measurement?
• Is the measurement accurate?
• How accurate?
• REALLY?
• How should we treat and report our experimental
  data?

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COURSE PHILOSPHY / EXPECTATION

• We provide plenty of support
• BUT Self-learning is the key.
• This is a course that you will not do well in if
  you just go for the grade rather than
  understanding
• Practical final
• Written final
• Be curious. Expect (as always) to spend roughly
  7-9 hours OUTSIDE the LAB on this class.

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BASIC VOCUBLARY

• Accuracy how close to the known value?
• Resolution minimum difference that can be
  resolved
• Repeatability agreement between identical
  measurements
• Hysteresis does the direction or order of the
  measurements matter?

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ERRORS!

• Even when you do it right there are errors in
  your measurement!
• There are two types of errors
• - Systematic errors
• - Random errors
• Systematic error could be due to the calibration
  error
• Random errors are usually caused by uncontrolled
  variables in the measurement process
• Lecture next week on error analysis
• Chapters 2, 6-7 in your text cover this material

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REVIEW OF BASIC MEASUREMENTS

• Please read section 3.3 in chapter 3 of the book

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DIGITAL MULTIMETER

• This device measures voltage, current or
  resistance
• Two types of voltages can be measured with a
  D.M.M.
• - Direct current (DC)
• - Alternating current (AC)
• It is not good for a time varying signal

ELVIS
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OSCILLOSCOPE

• It gives you qualitative and quantitative
  information
• It allows visualization of a voltage waveform
• Voltage is along the vertical axis and time is
  along the horizontal axis

http//www.doctronics.co.uk/scope.htm
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MORE ON OSCILLOSCOPES
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HOW DOES IT WORK?
http//www.egr.uh.edu/courses/ECE/ECElabs/useos.ht
ml
http//www.doctronics.co.uk/scope.htm
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COUPLING

• There are three coupling positions
• - AC
• - DC
• - Ground
• When the DC position is selected, the input is
  directly connected to the amplifier and is not
  altered in anyway
• When the Ground position is selected, the input
  amplifier is shorted
• to the ground
• When the AC position is selected, the input is
  connected to the amplifiers through a
  capacitor (the idea is to remove DC component of
  the signal and
• to attenuate the lower frequency component
  of the input signal.

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THREE OBJECTIVES -THIS WEEK

• To familiarize oneself with
• - an oscilloscope,
• - frequency generator,
• - digital multi-meter
• Use of Ohm and Kirchoffs laws
• Introduction to LabView

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THIS WEEK IN LAB
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MEASUREMENTS IN THE LAB - DC AND AC VOLTAGE

• DC Voltage
• AC Voltage with a signal generator

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MEASUREMENTS IN THE LAB - RESISTANCE

• A resistor is an electrical component that
  limits or regulates the flow of
• electrical current in an electronic
  circuit.
• Resistors can also be used to provide a
  specific voltage for an active
• device such as a transistor
• Current through a resistor is inversely
  proportional to its resistance ,
• and directly proportional to the voltage
  across it. This is the well-
• known Ohm's Law .

Black Brown Red Orange Yellow Green Blue
Violet Gray White 0 1 2
3 4 5 6
7 8 9
25,000 Ohms
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KIRCHOFF RULES

• The algebraic sum of the currents entering and
  leaving
• a junction is zero
• The algebraic sum of the changes in potential
  around a
• closed loop is zero

I2
I1
I1I2I3
I3
b
c
0(Vb-Va)(Vc-Vb)(Vd-Vc)(Va-Vd)
a
d
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MEASUREMENTS IN THE LAB - CURRENT

• Do not forget to complete the circuit
• Measure your resistance with dry and wet hands
• There is an anomaly in three different methods

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ELVIS Educational Laboratory
Virtual Instrumentation Suite

• LabVIEW-based design and prototype environment
• Multifunction data acquisition (DAQ) device,
• A custom-designed bench-top workstation and
  prototype board

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APPLICATIONS
There are a large number of applications of what
you will be learning in next ten weeks
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Assignments

• Before each lab.
• Understand what you are supposed to do
• Read relevant sections in the book, there will
  be a short
• in-lab quiz and continuous assessment by the
  TAs and
• instructors
• For next week
• Go to www.ni.com and complete the 3-hour
  Labview tutorial

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Have Fun!