LAB 3
FIRST ORDER CIRCUITS
Real Instruments
Resistor, Capacitor and Inductors
1.
INTRODUCTION
First order systems or circuits in this case are called firstorder because the system response is
described by one firstorder differential equation (typically one independent energy storage
element).
The RC circuit is governed by the following differential equation:
u
x
x
τ
=
+
with τ = RC
2.
OBJECTIVES
s
Test the step and frequency response of a resistor, capacitor and inductor.
s
Understand the basic characteristics of a high pass filter.
3.
LIST OF COMPONENTS AND EQUIPMENT REQUIRED
List of Components
s
Resistors:
200
Ω
(1)
s
Capacitors:
0.1
μ
F (1)
s
Inductors:
1 mH (1)
s
Hookup wire AWG # 22.
Equipment required
s
Power Supply.
s
Signal generator.
s
Oscilloscope.
s
Digital Multimeter
s
Breadboard.
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HANDS ON
4.1
STEP RESPONSE OF AN RL CIRCUIT
Remember to set your Function Generator to “High Z” (you can find it under Utility>Output
Setup)
. Connect in series the 200
Ω
resistor and the 1 mH inductor. Select a
square wave
with a
frequency of 100 Hz, amplitude of 5 VPP and an offset of 2.5 volts.
Figure 1
RL Circuit for Section 4.1
s
Measure the inductor resistance using the Multimeter.
s
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 Fall '09
 Staff
 RC circuit, Highpass filter, Lowpass filter, RL circuit, digital multimeter

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