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Electronic Instrumentation
Experiment 1
* Part A: Circuit Basics, Equipment, Sound Waves
* Part B: Resistors, Circuit Analysis, Voltage Dividers
* Part C: Capture/PSpice
Part A

Circuit Basics
 Equipment
 Sound Waves
Automobile Electronics
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Previously all mechanical systems have
become increasingly electronic
Over the past few years, for example, the
automobile has begun to use more
computers (microcontrollers)
How many microcontrollers are typically
found in a modern automobile?
Automobile Electronics
Physical Model for a DC circuit
Physical Model for Resistance
Physics vs. Electronics
Ohm’s Law
Alternating Current Generators
http://micro.magnet.fsu.edu/electromag/java/generator/ac.html
AC Circuits
Review of Sinusoids
General form of the Sinusoid
DC Source E3631A
ADJUST
VOLTAGE
LEVEL
TOGGLE
OUTPUT
ON/OFF
-25 to 0 VOLTS
0 to 6 VOLTS
GROUND
GROUND
0 to 25 VOLTS
Do Not Use
Function Generator 33120A
Digital Multimeter 34401A
Oscilloscope 54600B
Impedance

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Definition: a general measure of how a
circuit affects the current through it.
Impedance = resistance + reactance
Impedance is used to refer to the behavior
of circuits with resistors, capacitors and
other components.
In a resistive circuit, impedance=resistance.
Equipment Impedances



Each measuring device changes the circuit
when you use it.
The impedance of the device helps you
understand how much.
Device Impedances
•
•
•
•
•
Function Generator: 50 ohms
‘Scope: 1Meg ohms
DMM (DC voltage): 10Meg ohms
DMM (AC voltage): 1Meg ohms
DMM (DC current): 5 ohms (negligible)
Effect of Impedance on Circuit
What to do
How Ears Work
http://members.aol.com/tonyjeffs/text/dia.htm
Part B

Resistors
 Circuit Analysis
 Voltage Dividers
Combining Resistors in Series
Combining Resistors in Parallel
Reading Resistors
http://www.dannyg.com/javascript/res/resload.htm
Measuring Voltage
Voltage Dividers
More on Voltage Dividers
Kirchoff’s Laws
Circuit Analysis (Kirchoff Method)
Circuit Analysis (Combination Method)
Protoboards
Part C

Capture/PSpice
• Circuit Analysis Software
Capture
Simulations
PSpice
Cursors
Adding Traces