Lab report

2. Objective: Clearly state the objective of the laboratory in your own words. 3. Procedure: Provide a summary of the procedure used in the lab. Do not copy the
procedure from the lab manual. Any change in the procedure while conducting the lab to
the procedure given in the lab manual should be noted 4. Recorded Data: Whenever possible use tables and figures to provide all the recorded data.
The lab instructor may request that a student repeat the lab if any of the required data are
missing. 5. Post Lab: If post lab questions are given they must be answered in this section. These
shall be answered after the lab is over. 6. Conclusion: A brief conclusion shall be presented by the student. The conclusion should
be based on the observations and recorded data.


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EE 282 – Circuit I
Lab 10
RL circuits
Name ______________________________
Concepts: In this lab we will be learning about the transient characteristics of RL
Equipment: Oscilloscope, NI elvis system, 1 resistor, 1 inductor
The nominal (but not exact; you need to measure the actual) values of the resistors are:
R =3750 ?
L = 10mH?
Use the handheld multimeter to measure and record the actual values of the resistor.
R1 _________
Build the circuit on your breadboard and connect the elvis power supply as shown in figure
Use the oscilloscope channel 1 and channel 2 to observe both the input and output of the
RL voltage divider. Adjust the frequency and measure the time required for the voltage
across the resistor to become 2/3 or 63.2% of the final value.
Time constant (L/R) = _______ Measured Time Constant = ________
Percent error = ___________________
Part 2: Switch the inductor and resistor in the circuit so you can measure the voltage
across the inductor. Set the function generator to 1 kHz and observe several periods of the
input square wave. How does the output voltage appear on the screen? What mathematical
operation is the circuit performing? Now zoom in on one of the “spikes” and measure the
time constant from the decaying exponential. Do you get the same value you got in Part 1?
Mathematical operation: ______________________
Time Constant (L/R) = ____________
Measured Time Constant = ________
Percent error = ___________________
Lab 10 detailed version
Nimanthi Nandasiri
RL circuits
Equipment needed:
R1=3750O (Use decade resistor box); L= 100mH Inductor; NIELVIS oscilloscope; NIELVIS Function
Part 1
1. Calculate the time constant for the circuit. For RL circuit, ???? ???????? =
To measure the time constant,
Build the following circuit on your breadboard.
3750 ?
Use channel “0” of the Scope to measure input voltage waveform of the circuit and
channel “1” to measure output voltage (across the 3750 resistor) waveform of the
Lab 10 detailed version
Nimanthi Nandasiri
Input parameters to use in the NIELVIS function generator:
Frequency: 1000Hz
Voltage peak to peak =2V
Square waveform
Hit run
Open NIELVIS Oscilloscope and observe waveforms. (make sure to hit enabled on channel 1
Save a printout of the oscilloscope display and attach to the lab report.
If you look at the waveforms from the oscilloscope you should get waveforms similar to the
following figure.
Lab 10 detailed version
Nimanthi Nandasiri
Now we need to measure the time constant. This can be done by, measuring the time required
for the voltage across the resistor to become 36.8% of the initial voltage (or 63.2% of the final
Initial voltage should be something close to 1V, since the amplitude is 1 V.
First calculate 36.8 of initial voltage=
× 1? = 368??
We will move the C1 cursor to the initial voltage(~1V) and C2 cursor to the 36.8% of the
initial voltage(~368mV). Then measure the time difference (dT) between the two
2. dT will be the measured time constant.
3. Find error %
??????? ????? =
?????????? ???? ???????? – ???????? ???? ????????
?????????? ???? ????????
Part 2
Now change the circuit so the inductor is in the resistor’s position and the resistor is in the inductor’s
position. Use the same function generator parameters. Do the same procedure as part 1.
Save a printout of the oscilloscope display and attach to the lab report.
3750 ?
Lab 10 detailed version
Nimanthi Nandasiri
1. Calculate the time constant
2. Measure the time required to discharge 63.2% of the original voltage (measure time constant)
3. Find percent error

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