ELEC
105 - Instrumentation and Measurements - An Overview
History
Some years ago the Electrical Engineering department was visited by delegations
from both the Chemical and Mechanical engineering departments. In
both cases they were dissatisfied with the course we were offering to them.
Their basic argument was that the material in the traditional course was
not usable for their students, and in both cases they requested a course
with more of a focus on instrumentation and measurement. And, as
a result of that request the deparment allowed me to attempt a design of
a course that would be more in the direction they wanted.
The resultant course is the course that has been offered a number of times.
Here
is a link to the schedule for the most recent offering of that course.
And, here is a quick overview of the contents of the course, week-by-week.
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Week 1: Basic concepts
- voltage, current, resistance, voltage dividers
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Week 2: Sensors
1 - Temperature sensors, Time Constants
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Week 3: Signals
and Time Constants
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Week 4: Sensors
2 - AC tachometers, Sinusoidal Signals (Amplitude, Frequency), Sampling
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Week 5: Filters
- Filtering noise from signals, AC sinusoidal behavior of filters.
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Week 6: Fourier
1 - Fourier Series representations of periodic signals.
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Week 7: Fourier
2 - FFT
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Week 8: LabVIEW
- Introduction
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Week 9: IEEE-488
Systems - GPIB instruments and LabVIEW
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Week 10: Data -
Data representations (integer, floating point, character string), File
operations, Data storage
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Week 11: Data Converstion
- Converting data in LabVIEW, Data presentation
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Week 12: Control
1 - ON-OFF Control
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Week 13: Control
2 - Proportional Control & Implementation, Error analysis, Intro to
Response
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Week 14: Networks
- Control across the network using LabVIEW
How ELEC105
is taught
There are several aspects of the course that should be noted.
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There is no textbook that
gives the material covered in this course.
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I have a website for the
course, and here
is a link to the course web-site. This web-site has links to
material in a "book-like" web site that has been used for several courses
and which is used by numerous teachers on the web from numerous places
around the world.
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The "book-like" web site
has material on all of the topics in the course. Here
is a link to that web-site. The material on that web-site prints out
to over 1000 pages and there is a lot of interactive material including
simulations, self-grading questions, etc. Check out the index (top
button on the left) for a "book-like" index of links to material within
the site.
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The course is as active
as possible.
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There is a lab for every
topic. As much as possible, we do not give "by-the-numbers" instruction
for the lab work even though the primary audience is Civil, Mechanical
and Chemical engineering students - with a few Chemistry majors tossed
in at times.
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Class time is active -
i.e. various kinds of active learning techniques are used. There
are numerous in-class problems and questions that are used throughout the
semester.
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Course outcomes:
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Are available from the
start of the course. They are written to specific levels in Bloom's
taxonomy and I aim for a format where I tell them what is given, and given
that, what they should be able to do. As much as possible I used
McBeath action verbs to describe what they should be able to do.
Here is a link to the course
outcomes.
Recent
Changes in ELEC105
The version in Spring 2008 changed somewhat from prior offerings.
Here are the details of the changes.
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Elimination of Diode and
Op-Amp material.
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In previous offerings
I had students rectify and filter the output of the AC tachometer.
That necessitated discussing diodes and operational amplifiers. That
was done too hastily and ultimately seemed to me to be something that took
us away from the main flow of ideas in the course. There was only
the one sensor - the AC tach - that required those topics, and even though
they are usually included in courses for Chemical, Mechanical and Civil
engineers, they seemed off the track.
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Addition of material on
effects of sampling on measurements.
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Sampling effects (aliasing)
can cause loss of information, and can be misleading. Using the oscilloscope
to measure an AC tach output as a motor came up to speed or as it slowed
to rest produces signals that have to be under-sampled if the complete
transient is going to be captured on an oscilloscope display. That's
one place that almost necessitated some discussion of sampling.
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Adding material on sampling
gave me an opportunity to discuss sampling in sound systems (CDs, iPods,
etc.) and make those kinds of connections - connections that are valuable
in understanding that material.
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In turn, all of this required
that I develop web-based material on sampling effects. The material
developed is good, but I know that I will have to add to it next year.
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Change in quiz policy
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In previous offerings
I gave a quiz every Wednesday through the semester (13 quizzes) and the
quiz started after a half-hour into the class period. In the half
hour before the quiz I allowed students to ask questions about the quiz
material. After reading the paper at
this link (and other papers on that same topic. See Jeff
Karpicke's page.), I thought it better to have a quiz situation
where there were no cues about the quiz material, i.e. to work toward unaided
recall or complete retrieval. By allowing questions, I permitted
students to put material into their short-term memories and that material
was available during the quiz.
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This past semester I still
gave the quiz at the end of the half hour, but did not permit questions
prior to the quiz. The research evidence would suggest that this
was a better student learning experience since it should have been closer
to a complete retrieval event for the students.
What
is in this Notebook?
This notebook has material for this course, including:
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My thoughts on the course
- why it is the way it is, what I am trying to do, etc.
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Links to thoughts on each
week's material
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Week
1 - Basic Concepts & Intro to Sensors
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Week
2 - Sensors & Time Constants
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Week
3 - Signals
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Week
4 - Sensors - 2 & Sampling
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Week
5 - Signals
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Week
6 - Fourier 1 (Fourier Series)
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Week
7 - Fourier 2 (FFT)
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Week
8 - LabVIEW Introduction
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Week
9 - IEEE-488 (GPIB) Measurements in LabVIEW
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Week
10 - Data Representations
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Week
11 - Data Conversion
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Week
12 - Intro to Control - ON-OFF Control
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Week
13 - Proportional Control Steady State
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Week 14 - Measurement
and/or Control across the Network
zz