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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 Slide template