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EE Science Il Laboratory #4
Function Generators and Oscilloscopes
Laboratory Assignment
Identify the model of the function generator and oscilloscope on your bench.
Function Generator (Model no.):
Oscilloscope (Model no.):
————–
Turn on the function generator and oscilloscope. Connect the function
generator to the oscilloscope using a BNC
cable as shown in Figure I.
33500B Series Wavefonn Generator
SYNC
o.
1
0
Figure 1: Connect output channel I of the function generator to channel I of
the oscilloscope.
Part I: Generating a signal using the function generator
Configure the function generator to generate a sinusoidal waveform of
frequency 10 kHz and amplitude 2Vpp using
the procedure below. Please refer to the diagram ofthe front panel on
the last page of this manual (Figure App.I) if
you are having trouble finding any button.
I. Set the frequency to 10 kHz – Press the “Parameters” button on the front
panel of the function generator.
(Located under #5 Fixed Function Buttons in Figure App. I). Select
“Frequency” by pressing the button
below the word ‘Freque ncy’ (#4 in Figure App. I). Enter IO using the
numeric keypad and select kHz.
Note: Any option displayed on the screen can be selected using the softkey
s below the screen.
2. Set the amplitude to 2 Vpp – Select “Amplitude” by pressing the
button below the word ‘Amplit ude’ (#4 in
Figure App. I). Use the keypad to enter the number 2 and select Vpp.
3. Verify the impedance and tum on t_he outout — Select the output
by pressing “Channel” under channel setup
(#9 in Figure App.I). Press the key below ”Output Load” and verify
that “CHI Output Load” is set to 500
and press “Done” . Tum on the output by selecting “Outpu t” on the screen.
4. The signal generator can be modele d by an equivalent circuit consisti
ng of an AC voltage source in series
with an impedance called the source impedance, Z,, as shown in Figure
2. Depending on the output load
setting, Z out, the internal source voltage, V, is scaled in order to obtain
the desired voltage across the output
terminal using the equation for a simple voltage divider given below:
V = VSZOUI
OU/ z z
S
© University of South Florida
+
OU/
2
EE204-exp
Laboratory #4
I
If a 50 fl load is connected to the output, calculate the source
voltage, V, such that Vout = 2 Vpp. (Hint: Use
the equation above) . Vs=
——
Zout =
Vout
son
Function Generator
Figure 2: Equivalent circuit of the function generator.
Before proceeding to the next part of the laboratory, ask
your TA to check the waveform displayed on
your oscilloscope and obtain his/her signature on the first page.
Part II: Measuring the signal using the oscilloscope
You will need to refer to the document ‘WAM I Lab Oscillo
scopes Operation Guide’ for the following steps. Please
download the document from canvas.
I.
For your oscilloscope, refer to the oscilloscope operation guide
and set the oscilloscope impedance to 50 fl.
This sets the input impedance of tbe oscilloscope, and
for this experiment plays the role of the Zout in
Figure 2.
Note: In practice, the input port of the oscilloscope also
consists of a parallel capacitance. The effects of this
capacitance are not significant in this experiment but you
will encounter some effects of this capacitance
later in the semester.
2.
Setting the time axis a.
What is the period of the wavefo rm generated by the functio
n generator?
Period = _ jt C
;L -~-
b.
Display two periods of the signal on the oscilloscope display
.
The corresponding scale of the x-axis (in µs /div) is .:J (I
fl
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