Download Week 3

Principles to Computer Engineering
ENG_4_532:
Week 3
Principles of Computer Engineering:
Experiment 1
Introduction to test equipment
Experiment 1
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Introduction to Breadboard
Build simple electrical circuits
Develop familiarity with Digital and Analogue Multimeters
Introduction to Oscilloscopes and Signal Generators
Building a Circuit on the Breadboard
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Push the component legs into suitably located sockets on
breadboard with care
Try to layout circuit neatly to look like that of the circuit
diagram
Double check circuit before connecting power (check polarity!)
Use colour coded wires where possible; red = +V, black = 0V,
blue = -V
Example Circuits to be Built
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The Lamp Circuit
Digital and Analogue Multimeters
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Can be used to accurately measure voltage and current in a
circuit
Have different characteristics – simple experiment to compare
them
DMM has an accuracy of around ±1%
Analogue MM accurate to around ±5%
Ideally have infinite internal resistance as acting as a voltmeter
Digital and Analogue Multimeters
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Use 1MW resistors in series with both Voltmeters to estimate
their input resistances
1 MW Resistor
+
PSU
-
+
1MW
Analogue
meter
V
IL
Meter
+
+
5V
Rx
V
m
Figure 2
Analogue meter in high impedance
5 volt circuit
Figure 4
Loading effects at 5 volts
The Oscilloscope
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Used to display time varying
waveforms
Apply sinusoidal signal from
generator at 1kHz
(Alternating current)
Measure frequency and
voltage with ‘scope facilities
Peak-to-Peak Voltage can be
measured
Vrms 
V pp
2 2
The Oscilloscope
Summary
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Become familiar with use of a breadboard
Build elementary circuits and test them
Use standard test bench equipment and appreciate their
accuracy
Introduce the use of oscilloscopes