This paper presents a method of studying RLC circuits with the help of the oscilloscope in the XYZ mode, complemented by an electronic device which generates a marker-trace on the screen and which is used to measure frequencies without needing any reference point on the screen. Although the electronic device can be used in a fairly quantitative manner, the authors have proved its special utility in the teaching of electric resonance, since it shows the phenomena associated with electric resonance in a very intuitive way.
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