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EE101_CHAPTER 3: OSCILLOSCOPE AND SIGNAL GENERATOR
Transcript of EE101_CHAPTER 3: OSCILLOSCOPE AND SIGNAL GENERATOR
Practical Test Lecture weeks:
week 8 - week 11 1 cycle = 10 div
TD = 2 div
1 cycle : 10 div = 360o
2 div = 72o 3. Phase Measurements or Time Delay, TD (Time/Div : 0.5ms/Div) Measurement of OSC Period, T
T = (Time/Div) x (no. div/cycle)
= 0.5ms/div x 10
b) Frequency, f
F = 1/T
= 200 Hz 2. Period and Frequency Measurements (Time/Div : 0.5ms/Div) Measurement of OSC Voltage Peak-to-Peak
Vp-p= (V/Div) x No. of vert. div.
= 100 mv/div x (3.8 x 2)
= 0.76 V
b) Voltage Peak
Vp = (V/Div) x No. of vert. div.
= 100 mv/div x (3.8)
= 0.38 V 1. Voltage Measurements (Volt/Div : 100mV/Div, Time/Div : 0.5ms/Div) Measurement of OSC We have learned at brief about the control functions of a basic oscilloscope.
Various control buttons on the oscilloscope serve their own purpose in control. Conclusion The speed the spot travels across the screen of the tube may be varied by means of the Timebase selector switch.
This is calibrated in Seconds (S), MilliSeconds (mS = 0.001 seconds) or MicroSeconds (uS = 0.000001 seconds). Timebase The focus control is also quite self-explanatory but most "scopes" seem to adjust a single spot from a short horizontal to a vertical line.
A single horizontal line is therefore not the best waveform to adjust the focusing, this is best done whilst viewing a waveform. Focus This is self-explanatory, it controls the intensity of the display. It is well worth remembering that one cannot execute screen-saver programs on an oscilloscope, so leaving the scope with a high brilliance will certainly burn the trace into the tube face.
If you must leave your scope switched ON for any length of time then turn the brilliance control down. Brightness Basic Oscilloscope Timebase – To select the speed which the trace moves across the tube face.
Input Level- To adjust the input level.
Pos (Position) – To set the position of the trace on the display. Basic Oscilloscope The basic controls are:
Bright – To adjust the intensity of display.
Focus – To adjust the focusing of display.
Grat (Graticule) – To illuminate a scale used to measure a trace.
Trigger – To select a trigger source.
Trace – To select which trace is to be displayed. The Oscilloscope is nothing more than just an instrument for displaying electrical signals in the TIME domain. Meaning that, you can view waveforms on it.
Some of the uses of the scope may not be obvious but if you already possessed one, then you will most probably regard it as the most useful tool on your workbench.
So, what is actually an oscilloscope? Introduction Objectives At the end of this chapter, the students should be able to:
describe the basic control functions of an oscilloscope.
practice their knowledge in using an oscilloscope to display various electrical signals. The Control Functions of Oscilloscope Selects which trace is to be displayed.
There are usually two or more selections possible:
A - Selects trace A only (single channel).
B - Selects trace B only (single channel).
A+B - Selects both trace A and trace B (dual channel).
ADD - Both channel inputs are added and displayed as a single trace. Trace Basic Oscilloscope Summary A function generator is a device that can produce various patterns of voltage at a variety of frequencies and amplitudes.
We can control output of the function generator in terms of frequencies, amplitude as well as the type of signal. Conclusions After powering on the function generator, the output signal needs to be configured to the desired shape. Typically, this means connecting the signal and ground leads to an oscilloscope to check the controls.
Adjust the function generator until the output signal is correct, then attach the signal and ground leads from the function generator to the input and ground of the device under test.
For some applications, the negative lead of the function generator should attach to a negative input of the device, but usually attaching to ground is sufficient. How to use a function generator? The frequency control of a function generator controls the rate at which output signal oscillates. On some function generators, the frequency control is a combination of different controls.
One set of controls chooses the broad frequency range (order of magnitude) and the other selects the precise frequency. This allows the function generator to handle the enormous variation in frequency scale needed for signals. Features and controls The amplitude control on a function generator varies the voltage difference between the high and low voltage of the output signal.
The direct current (DC) offset control on a function generator varies the average voltage of a signal relative to the ground. Features and controls Most function generators allow the user to choose the shape of the output from a small number of options.
-Square wave - The signal goes directly from high to low voltage. -Sine wave - The signal curves like a sinusoid from high to low voltage. -Triangle wave - The signal goes from high to low voltage at a fixed rate Features and controls A function generator is a device that can produce various patterns of voltage at a variety of frequencies and amplitudes.
It is used to test the response of circuits to common input signals. The electrical leads from the device are attached to the ground and signal input terminals of the device under test. What is a function generator? Example of Function Generator Introduction to the Function Generator POWER POINT NOTES