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Oscilloscope - Basic oscilloscope operation This worksheet...

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Basic oscilloscope operation This worksheet and all related files are licensed under the Creative Commons Attribution License, version 1.0. To view a copy of this license, visit http://creativecommons.org/licenses/by/1.0/, or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. The terms and conditions of this license allow for free copying, distribution, and/or modification of all licensed works by the general public. Resources and methods for learning about these subjects (list a few here, in preparation for your research): 1
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Questions Question 1 An oscilloscope is a very useful piece of electronic test equipment. Most everyone has seen an oscilloscope in use, in the form of a heart-rate monitor (electrocardiogram, or EKG) of the type seen in doctor’s offices and hospitals. When monitoring heart beats, what do the two axes (horizontal and vertical) of the oscilloscope screen represent? trigger timebase s/div DC GND AC X GND DC V/div vertical OSCILLOSCOPE Y AC In general electronics use, when measuring AC voltage signals, what do the two axes (horizontal and vertical) of the oscilloscope screen represent? trigger timebase s/div DC GND AC X GND DC V/div vertical OSCILLOSCOPE Y AC file 00530 2
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Question 2 The core of an analog oscilloscope is a special type of vacuum tube known as a Cathode Ray Tube , or CRT . While similar in function to the CRT used in televisions, oscilloscope display tubes are specially built for the purpose of serving an a measuring instrument. Explain how a CRT functions. What goes on inside the tube to produce waveform displays on the screen? file 00536 3
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Question 3 When the vertical (”Y”) axis of an oscilloscope is shorted, the result should be a straight line in the middle of the screen: trigger timebase s/div DC GND AC X GND DC V/div vertical OSCILLOSCOPE Y AC Determine the DC polarity of the voltage source, based on this illustration: trigger timebase s/div DC GND AC X GND DC V/div vertical OSCILLOSCOPE Y AC Battery file 00531 4
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Question 4 An oscilloscope is connected to a battery of unknown voltage. The result is a straight line on the display: Assuming the oscilloscope display has been properly ”zeroed” and the vertical sensitivity is set to 5 volts per division, determine the voltage of the battery. file 01672 Question 5 An oscilloscope is connected to a battery of unknown voltage. The result is a straight line on the display: Assuming the oscilloscope display has been properly ”zeroed” and the vertical sensitivity is set to 2 volts per division, determine the voltage of the battery. file 01673 5
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Question 6 A technician prepares to use an oscilloscope to display an AC voltage signal. After turning the oscilloscope on and connecting the Y input probe to the signal source test points, this display appears: trigger timebase s/div DC GND AC X GND DC V/div vertical OSCILLOSCOPE Y AC What display control(s) need to be adjusted on the oscilloscope in order to show fewer cycles of this signal on the screen, with a greater height (amplitude)?
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