This paper takes the tracing of series resonance point and the confirmation of Q point in physics experiment as an example to introduce the method of circuit connection based on the free trial version of Multisim12. The virtual oscilloscope is used to demonstrate the varieties of the voltage of signal source and the resistance when the signal source changes. We can get the series resonance frequency by comparing these two varieties. The virtual multi-meter is used to get the Q point of the series circuit. At the same time, this paper also uses the virtual multimeter to intuitively obtain the quality factor of the series circuit. This simulation is suitable for teaching as an experiment and studying in the spare time.
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