In this guided project, the frequency response of an LCR circuit is investigated by both steady-state and transient methods. The resonant property that we study here is of great practical use, facilitating frequency tuning, filtering, and oscillation in a myriad of electronic circuit applications. Our circuit consists of a series combination of an inductor, capacitor and resistor with component values chosen to produce light underdamping. An AC voltage source drives the circuit and the resulting AC current flowing within the circuit is monitored. First, the circuit response is explored under steady-state conditions. For this investigation, the AC voltage source is sinusoidal. The circuit’s resonant response is observed by sequencing the source frequency, f, over a wide range of values while measuring the amplitude of the current, Io, at each frequency. The resulting graph of Io versus f is then used to determine the resonance frequency, peak width and Q-value of the circuit’s resonance curve. Second, the circuit response is explored under transient conditions. Now, the AC voltage source driving the circuit has a unipolar square-wave shape and, after the square wave transitions to its zero level, the resulting transient AC current is measured. By directly measuring the frequency of this transient oscillation or by determining the frequency via a fast Fourier transform, the circuit’s resonance frequency can be quickly and accurately determined. During this project, you will explore how software triggering is implemented to control the acquisition of a voltage waveform by a data acquisition (DAQ) device.
Now that you know a little bit about the basics of the project, you are ready to get started.
Click Here to download the Electrical Resonance Effect instructions, navigate to the Resources tab to download a zip file containing the pdf of instructions as well as example code.
Electrical Resonance Effect Module
Resonance.zip
Electrical Resonance Effect PDF
Circuit Resonance Core Concept.pdf