Electrosurgical system for multi-frequency interrogation of parasitic parameters of an electrosurgical instrument

An electrosurgical system includes an electrosurgical generator and an instrument coupled to the electrosurgical generator. The electrosurgical generator includes an output stage configured to generate the electrosurgical energy at a plurality of radio frequencies, a plurality of sensors configured to sense a voltage waveform and a current waveform of the electrosurgical energy, and a controller coupled to the output stage and the plurality of sensors. The instrument supplies the electrosurgical energy to the tissue. The controller of the electrosurgical generator is further configured to calculate at least one parasitic parameter based on the electrosurgical energy at the plurality of frequencies and control the output stage based on the at least one parasitic parameter.