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Using an Oscilloscope
Learning Objectives
• Understand the basic operation of a Cathode Ray Tube
• Understand what an oscilloscope is displaying
• Be able to operate the basic functions of an oscilloscope
• Sensitivity control (Volts / division vertical)
• Sweep speed (Time / division horizontal)
• H position
• V position
• Automatic (auto) trigger
• Trigger level for viewing signals on channels 1 and 2
• View signals on channels 1 and 2
• View and describe an unknown signal in terms of:
• Amplitude
• Frequency
• Period
• Pulse duration
• View and identify cosmic ray signals from a scintillation
counter
Using an Oscilloscope
Outline
• Introduction
Using an Oscilloscope
Introduction
• Oscilloscopes are common, useful tools for viewing electric
signals
• An electric signal is the flow of charge through a conductor
• An oscilloscope displays the voltage which is generated across
a resistor (50 ohms or 1 megaohm) as a function of time as the
electric signal passes through the resistor
• How is the voltage related to the flow of charge in the
electric signal?
• Current = charge flowing past a point (or through a resistor)
per unit time.
• Units = charge / time = coulombs / second = Amperes
• Variable used is I
• Ohm’s law V = I  R ; V = voltage, R = resistance
Using an Oscilloscope
Display (Cathode Ray Tube)
V position
H position
Trigger level
Voltage
Time
Channel 1 Input
Channel 2 Input
Sweep speed
(Time / division, horizontal)
Sensitivity controls
(Volts / division, vertical)
Using an Oscilloscope
Cathode Ray Tube
Using an Oscilloscope
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