lab3slides - Lecture 3 Digital Design Laboratory Copyright...

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Lecture 3 Digital Design Laboratory Copyright © 2007, 2008 Thomas R. Collins
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Lecture Outline z Oscilloscopes z Propagation Delay z Tri-state Drivers
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Oscilloscope basics z Video { View prior to lab { View again in front of oscilloscope z More info on web site { Manuals in Lab 3 download section Typical display of TDS360
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Manual oscilloscope measurements z Horizontal axis is time, multiplying units by timescale z Vertical axis is voltage, multiplying units by voltage scale z Scopes in lab can make measurements automatically z Make sure you understand the underlying principles { Be able to explain how manual measurements are made! 4 units of time 5 units of voltage
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Acquiring a waveform z Probe a point in your circuit z Scope can “sweep” continuously z Trick is to “trigger” at a defined point on the waveform, either { Capturing the same waveform over and over { Capturing a single instance of a transient waveform To get screens like this, you typically have to set • Timebase (Horizontal scale) • Vertical scale (volts/div) • Horizontal & Vertical positions (offsets) • Triggering AUTOSET feature accomplishes much of this, but may not be optimal for a particular measurement
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The Run/Stop key z If you find yourself hitting the run/stop key and trying to catch an event in a hit or miss fashion, you are doing something wrong z Sometimes, the run/stop key is useful to initiate a single sweep, or to interrupt the oscilloscope while acquiring many identical sweeps z Video explains triggering more clearly
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Lab 3 measurements z Period z Frequency z Rise Time z Fall Time z Positive/Negative Duty Cycle z Propagation Delay
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This note was uploaded on 04/19/2010 for the course ECE 2040 taught by Professor Yili during the Spring '08 term at Georgia Institute of Technology.

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lab3slides - Lecture 3 Digital Design Laboratory Copyright...

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