4/2/2009 1 of 4 CLB
Southern Polytechnic State University
Electrical and Computer Engineering Technology
ECET 1100 Laboratory Exercise No. 6 Oscilloscope Introduction
Name_________________________________ Lab Section___________ Date_____________
Introduction
In this exercise you will investigate the functions of an oscilloscope when used to perform
voltage measurements including DC and AC voltage magnitudes and phase shift.
Cautions
• Do not energize a circuit until your instructor checks it.
• Remove all power from a circuit before attempting to measure resistance in the circuit
with an ohmmeter. Remember to disconnect the resistance from the circuit.
• Remove all power before making changes in a circuit.
• Record all data in ink. Do not erase. Make corrections by drawing a line through the
incorrect data and write the correct data next to the deleted data.
Procedure
Note that all experimental data for this lab is to be neatly organized and written on a separate
sheet of paper. Space is provided on the last page of this document for you waveform sketches.
1. Connect the circuit shown in Figure 1, leave the power supply turned off.
+
_
E
S
=
12 V
Figure 1
R
1
= 1 kΩ
R
2
= 2 kΩ
+
_
E
S
=
12 V
Figure 2
R
1
= 1 kΩ
R
2
= 2 kΩ
v
R1
v
R2
++
_
_
Ch. 2
Ch. 1
2. Connect Channel 1 of the oscilloscope to measure the source voltage and channel 2 to
measure the voltage across R2 (as shown in Figure 2).
3. Turn on the oscilloscope.
4. Set the Vertical Mode switch to CHOP, the Horizontal s/div knob to 1ms/div, the Trigger
switch to Ch.1, the Trigger Level knob to the 12 o’clock position, and the Vertical Volt/div
knobs for both channels to 2 V/div.
5. Set the Coupling switch for channel 1 to Gnd, and use the Vertical Position knob to move
the channel 1 trace to the bottom line on the oscilloscope display. This sets the bottom line as
the zero volt reference.
6. Repeat step 5 for channel 2. Both traces should appear in the same position on the display.
