Fundamental Properties of AC Circuits/Lab Alternating Voltage and Current
- atch Week 1 Video Lecture 1: Introduction to Virtual Instruments from the weekly content and the video in this lab assignment on "Introduction to Virtual Breadboarding in MultiSIM"
- Week 1 Video Lecture 1 - Introduction to Virtual Instruments (Refer to the weekly content)
- Week 1 Video Lecture 2 - Introduction to Virtual Breadboarding in MultiSIM
- Please note that the virtual breadboard circuitry in the "Week 1 Video Lecture 2 - Introduction to Virtual Breadboarding in MultiSIM" is incorrect and should be modified. Check this document to correct the circuitry in the video to run the DCR and Connectivity check: Modified Circuit Design
- Construct the circuit of problem 1 in the Week 1 Assignment with MultiSIM using 3 Vrms at 60 Hz as your source. Use the Agilent function generator for the source.
- Using the Agilent multimeter, measure the voltages across the source and each resistor and fill out the chart below. Do not forget to put units on the chart. Be sure to provide a screenshot of your circuit with the instruments. Note what calculated value matched the Agilent multimeter measurement. Also, use the multimeter to measure RT (hint: remove the voltage source). Provide a screenshot of your measurement.
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Calculated |
Agilent Multimeter |
Tektronix Oscilloscope |
| VT = |
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| VR1 = |
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| VR2 = |
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| VR3 = |
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| IT = |
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| RT = |
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- Now repeat the measurements using the Tektronix oscilloscope and fill out the chart above (RT is not required). Provide a screenshot of at least one voltage measurement. Note what is required in order to duplicate the Agilent multimeter measurement.
- Show the calculated and measured period of the signal from the Tektronics Oscilloscope.
| Calculated period:
(source frequency 60 Hz)
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Measured period: |
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- Now change the values of R1 given below in the table and use Tektronix oscilloscope to record the measurements. Do not forget to add units in the chart. Take screenshots to show your work for the period measurement as well as for at least one case of R1. The screenshots should show the settings of the Agilent signal generator and o-scope along with the waveforms.
- Complete the following chart:
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| Source frequency 60Hz |
Tektronix Oscope Measurement |
| R1 = 5 kohms |
RT = |
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IT = |
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VR1 = |
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VR2 = |
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VR3 = |
| R1 = 10 kohms |
RT = |
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IT = |
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VR1 = |
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VR2 = |
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VR3 = |
| R1 = 15 kohms |
RT = |
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IT = |
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VR1 = |
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VR2 = |
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VR3 = |
| R1 = 25 kohms |
RT = |
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IT = |
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VR1 = |
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VR2 = |
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VR3 = |
| Source frequency 100Hz |
Tektronix Oscope Measurement |
| R1 = 25 kohms |
VR1 = |
| Source frequency 200Hz |
Tektronix Oscope Measurement |
| R1 = 25 kohms |
VR1 = |
- Using the initial circuit from step 2 and reviewing the week 1 - video lecture 2, initiate the virtual bread board feature in MultiSIM. Place components and run the DRC and Connectivity Check. Capture a screenshot of your circuit in the 3D Virtual Breadboard view including the results of the DRC and Connectivity Check. There should be zero error for the check.
- Based on your measurements, answer the following questions:
- Did your calculated and measured values match? If not, why?
- Does the multimeter give you the peak, peak-to-peak, or rms measurement?
- How did you obtain the same measurement on the Tektronix oscilloscope that you obtained using the Agilent multimeter?
- What is the industry practice to report AC measurements? Peak value or RMS value?
- Describe the effect of increasing R1 on the total resistance of the circuit.
- Describe and explain the effect of RT on the value of IT for a given value of VT.
- Does resistance depend on frequency? For a purely resistive circuit, does the voltage or current change as the frequency changes?
- What does DRC and connectivity check mean? If there was an error, what did you do to fix it?