Download Lecture-2 - Dr. Imtiaz Hussain

Electronic workshop
Lecture-2
Oscilloscope and Function Generators
Dr. Imtiaz Hussain
email: [email protected]
URL :http://imtiazhussainkalwar.weebly.com/
Outline
– Introduction
– Function Generator
• Waveforms
• Frequency and Amplitude Setting
• DC Level
– Oscilloscope
Introduction
• Electronic circuits need to be tested for their
functionality.
• This is done by applying test signals as input to
the circuits and observing their response.
• This requires a device which generates test
signals and another device for observing the
circuit response to those test signals.
Introduction
Function Generator
• A Function Generator is a device that is used to generate
test signals for testing electronic circuits.
• All function generators can generate three basic types of
waveforms
– Sinusoidal
– Triangular
– Rectangular
Function Generator
• We can control the amplitude and frequency of
generated waveforms.
Function Generator
• We can also control the DC level of generated
waveforms.
Function Generator
Function Generator Probes
Oscilloscope
• The oscilloscope is basically a graph-displaying
device
• It draws a graph of an electrical signal.
• In most applications the graph shows how
signals change over time:
– the vertical (Y) axis represents voltage
– the horizontal (X) axis represents time.
Example Electrical Signal
Y=VOLTAGE (volts)
5
2.5
-2.5
5 10 15
20
X=TIME (seconds)
-5
• Above, this sine wave represents a voltage that is changing
over time
• So at time=2.5s, what is the voltage?
– And again at 10seconds?...15 seconds?
• We can see that as time moves forward, the voltage is
changing
– Is this an AC or DC voltage? What does that mean?
What are the major components?
• Display Screen
– Displays an input signal
with respect to time.
• Control Panel
– Adjusts how the input
signal is displayed.
What is the purpose of an oscilloscope
• The purpose of an oscilloscope is to measure a
voltage that changes with time and show it in a
graphical format
1) Here is the oscilloscope in
our lab
-Notice the X-Y axes
2) Here is our alternating voltage
signal from before
3) If we measure our signal with the
scope, it would look like this!
Oscilloscope Screen
• Notice that the screen has
ruled
divisions
both
horizontally and vertically.
• The major divisions are
marked off in centimeters,
the middle lines also have
minor divisions every 0.2 of
a centimeter.
Oscilloscope Probes
Oscilloscope Problem
• Using the function generator, create a wave with
the following output:
–
–
–
–
3 kHz Frequency
Sinusoidal Shape
2 Volt Amplitude
D.C Offset 0
• Adjust the output so that only 2 complete cycles
are showing.
• When are you finished, call your tutor to inspect
it.
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END OF LECTURE-2