Using an Oscilloscope Learning Objectives Understand the basic operation of a Cathode Ray Tube...
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Transcript of Using an Oscilloscope Learning Objectives Understand the basic operation of a Cathode Ray Tube...
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
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
Channel 1 Input
Using an Oscilloscope
Channel 2 InputSensitivity controls(Volts / division, vertical)
Sweep speed(Time / division, horizontal)
V position H position Trigger levelDisplay (Cathode Ray Tube)
Voltage
Time
Cathode Ray Tube
Using an Oscilloscope
Slide template
Using an Oscilloscope