cmeter
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EL-32 June 5, 1997
[Filename: CMETER.DOC]
Capacitance Meter
Contributor: Tony King
Affiliation: University of HoustonAddress: Electrical and Computer Engineering
4800 Calhoun Rd.
Houston, TX 77204-4793
Phone: (713) 743-4423
Fax: (713) 743-4444
Email: tking@uh.edu
Type: Project
Student Time: Four Weeks
Location: Lab/Home
Summary
The project is to design a portable, hand held instrument to measure capacitance. The
meter should be lightweight, inexpensive, safe, reliable and accurate. Each team prepares
an oral and written report in conjunction with their prototype demonstration.
ABET Descriptors
Engr Sci Content: Electronics IIType: System
Elements: Analysis, synthesis, construction, testing and evaluation
Features: Development of student creativity, use of open-ended problems,
consideration of alternative solutions
Constraints: Economic factors, safety, reliability, performance, human factors
Effort: Team
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EL-32 June 5, 1997
[Filename: CMETER.DOC]
Capacitance Meter
Your assignment is to design, simulate and construct a portable, hand held instrument tomeasure capacitance. The meter should be lightweight, inexpensive, safe, reliable and
accurate. You must submit a design proposal, including simulation, for approval prior to
fabricating your prototype.
Your formal report should be well organized and conform to the guidelines distributed in
class [10%]. The report should include the following sections in addition to the abstract,
introduction and references:
Theory: What results do you anticipate? Perform the experiments mentally and
document your expectations (estimates, sketches, etc.). I recommenddoing this before setting foot in the lab. It can both enhance your
understanding of the project and save time. [25%]
Simulation: What were the simulation results? Include the circuit drawings and data
plots in your report. Create a folder named DP-(group name) containing
all your files and submit them electronically. [25%]
Experiment: What were the experimental results? Include experimental procedures,
circuit diagrams and data in tabular form. Data should also appear in
graphical form where appropriate. [25%]
Analysis: How do the experimental results compare with the simulation results and
your expectations? How do you account for any discepancies? [15%]
A signup sheet will be posted for reserving time to present projects to the instructor. The
written report must be submitted at least 24 hours prior to this presentation. After the
presentation, questions will be directed to each student to assess familiarity with the
project. Individual grades will be assigned based on these written and oral presentations.
You will have 30 minutes to present your project. You will be expected to come to the
presentation with a finished, working project. You will be given a set of capacitors in
order to test your prototype. If the project is not functioning properly, your grade will be
reduced accordingly.
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EL-32 June 5, 1997
[Filename: CMETER.DOC]
Capacitance Meter
Engineering Notes:
The instructor may wish to evaluate design proposals for safety prior to construction. The
instructor should also specify the minimum accuracy and operating range for the meter.
Allowing students to use a multimeter or oscilloscope can simplify the design.
Objectives/Comments:
Be prepared to discuss counters, comparators, signal generating circuits, bridge circuits,
etc.
Expected Outcomes:
Students have an opportunity to use electronics to solve an open-ended, economically
constrained design problem.
Discussion/Follow Up:
Allow the students to critique each others designs.
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