possible alternatives to using an oscilloscope for measuring action potential in the cockroach leg...
TRANSCRIPT
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Possible Alternatives to Using an Oscilloscope for
Measuring Action Potential in the Cockroach Leg
Laboratory
Matthew CroftSomerset High School
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Summary
While the Measuring Action Potential in the Cockroach Leg Laboratory is interesting and worthwhile, the equipment is not commonly found in a typical high school science department.
In addition, students may have difficulty operating oscilloscopes and obtaining data.
Several alternatives to using oscilloscopes are discussed.
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#1. The Poor Man’s Oscilloscope
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Introduction
Source: www.ledametrix.com/oscope/
It may be possible to construct a poor man’s oscilloscope using a 3.5mm audio cable that has been separated into three wires and attached to fine pins:
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Measuring Action Potential
Oscilloscope Software Example:
Audio Editing Software Examples:
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Measuring Action Potential
Sample Data from Audacity:
Speaker (similar to what we did in lab without the oscilloscope)
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Benefits & Drawbacks
Benefits Drawbacks
Oscilloscope Software
-Closest to original lab-Quantitative data
with graph-Data can be saved
-Purchase of Software-Possible damage to
computer-Signal is not amplified
Audio Editing Software
-Free software is available
-Quantitative data with graph
-Data can be saved
-Data is not collected in mV
-Possible damage to computer
-Signal is not amplified
Speakers-Audio response can
be rewarding to students
-Data is not quantitative
-Probably not feasible without amplifier
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#2. Multimeter
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Introduction
It may be possible to measure action potential on a multimeter set on mV.
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Benefits & Drawbacks
Benefits Drawbacks
Multimeter -Readily available-Easy to use
-May not be sensitive enough
-Data is not displayed in graphical format
-Signal is not amplified
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#3. Vernier Sensors
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Introduction
Vernier LabPro and LabQuest allow you to use a wide variety of sensors to collect information. Data can be analyzed in LoggerPro.
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Possible Sensors
Voltage Probe
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Possible Sensors
EKG Sensor
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Benefits & Drawbacks
Benefits Drawbacks
Voltage Probe
-Comes standard with LabPro
-Quantitative data with graph
-Will not damage computer
-Data can be saved and LoggerPro allows for
advanced data analysis
-Purchase of Hardware & Software
-Probe may not be sensitive enough-No ground wire
-Measurements are in V
EKG Sensor
-Quantitative data with graph
-Will not damage computer
-Three leads-Measurements are in
mV-Data can be saved and
LoggerPro allows for advanced data analysis
-Purchase of Hardware & Software
-Probe may not be sensitive enough
Ulf thinks it will work!
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