The systems and methods of the present disclosure calibrate impedance lossmodelparameters associated with an electrosurgical system having no externalcabling or havingexternal cabling with a fixed or known reactance, and obtain accurateelectricalmeasurements of a tissue site by compensating for impedance losses associatedwith thetransmission line of an electrosurgical device using the calibrated impedanceloss modelparameters. A computer system stores voltage and current sensor data for arange ofdifferent test loads and calculates sensed impedance values for each testload. The computersystem then predicts a phase value for each load using each respective loadimpedance value.The computer system back calculates impedance loss model parameters includinga sourceimpedance parameter and a leakage impedance parameter based upon the voltageand currentsensor data, the predicted phase values, and the impedance values of the testloads. Duringoperation, the electrosurgical device senses a voltage and a current, predictsa phase valuebased upon the sensed voltage and current, and calculates metrics at thetissue site basedupon the sensed voltage and current, the predicted phase value, the sourceimpedanceparameter, and the leakage impedance parameter.
