Lab #4
Oscilloscope Operation
Mearaz Ahmed Net ID: mma618
Introduction
In this lab the objective was to learn abut the function of a oscilloscope. This is done by
performing many measurements to illustrate the many functions of oscilloscope. An oscilloscope
is a voltmeter which sends electronic signals as a function of time, and it is very useful and used
by many electrical and computer engineers.
Procedure
In this lab,
Equipment Checklist
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Keysight DSO-X 2002A Digital Storage Oscilloscope
Keysight 33500B Waveform Generator
Tektronix CDM260 Digital Multimeter (DMM)
Fluke 8010A Digital Multimeter (DMM)
Tektronix CPS250 Power Supply (quantity 2)
Breadboard
Coaxial cables with BNC to alligator clip (quantity 2)
Jumper wire, banana to banana
Jumper wire, banana to alligator clip
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100 Ω, 5%, ¼-½ watt resistor
270 Ω, 5%, ¼-½ watt resistor
1 KΩ, 5%, ¼-½ watt resistor
Force Sensing Resistor, Interlink Electronics FSR 402 or equivalent
In the first part of this experiment, we want to setup the triggering of the oscilloscope. Then
we measured and took snapshots of the oscilloscope’s measurements at different times with
different offsets. The same was done with the oscilloscope in differential mode.
Data Collection
Figure 1: Oscilloscope Triggering
Figure 2: Sync Waveform for Channel 1
Figures 3 & 4: Sync Waveform when Plugged into Channel l1 – Square Wave & 1K Hz
Figure 5: Waveform of an FSR with 100 ms Horizontal Scaling
Figure 6: Waveform of an FSR with 2 ms Horizontal Scaling
Figure 7: Sine Wave with 0 VDC Offset
Figures 8 & 9: Sine Wave with 2.5V VDC Offset
Table 1 Selected measurements for a sine wave with a 0 VDC offset and a 2.5 VDC offset
Selected Measurement
Juwen
(a) Measured Value
(V) with 0 VDC offset
Peak-Peak
Maximum
Minimum
Top
Base
Amplitude
Average Full Screen
Average N Cycles
DC RMS (N Cycle)
AC RMS (N Cycle)
5.07
2.52
-2.55
2.52
-2.55
5.07
-7.3mV
-7.3mV
1.77V
1.768V
(b) Measured Value
(V) with 2.5 VDC
offset
5.03
7.53
2.51
7.51
2.57
4.94V
5.0186V
5.0185V
5.32V
1.7681V
The measured values for the voltage at 2.5 VDC offset is much greater than that of the 0
VDC offset. The maximum and minimum, top and base, average full screen, average n cycles,
and DC RMS all change due to the VDC offset. However, the peak-to-peak, amplitude, and AC
RMS all stay the same. This is because more cycles are shown with the offset but the amplitude
and other aspects of the function stay the same.
Table 2 Selected measurements for a sine wave with a 2.5 VDC offset
Selected Measurement
Period (seconds)
Frequency (Hz)
Measured Value
Juwen
1.0001ms
999.9 Hz
I would expect the measurements to decrease since the average N-cycles would decrease.
Figures 10 & 11: Two Waveforms in Channels One and Two Before and After the MEAS
Subsystem
Table 3 DMM measurements for resistors
Nominal Resistor
100 
270 
Measured Value
98.5
275
Calculated Voltage Drop (V)
1.32
3.68
Table 4 DMM measurements for voltage drops across circuit
Scope Channel Qixiao
1
2
Measured Voltage Drop (Vpp)
5.0V
3.7V
Enter VR1 , VR2, or (VR1 + VR2)
VR1+ VR2
VR2
The differential measurement for Vpp does equal the expected value for my calculated voltage
divider value shown in table 3.