The present invention is an electrosurgical system for treating tissue, the electrosurgical system having a first electrode and a second electrode, each of the first electrode and the second electrode being treated. The electrosurgical system has a high frequency high voltage supply unit, the high frequency high voltage supply unit being electrically connectable to the first electrode. And is electrically connectable to the second electrode and configured to supply a predetermined therapeutic AC voltage to the first electrode and the second electrode, the electrosurgical system includes a measurement unit And the measurement unit is electrically connectable to the first electrode and the second electrode and has a measurement voltage supply module, and the measurement voltage supply module has at least a first frequency and a second frequency Frequency measurement The measurement unit is further configured to supply an alternating voltage, and the measurement unit further receives an electrical response signal for the first frequency and the second frequency via the first electrode and the second electrode, and from there An electrosurgical system configured to detect at least one characteristic of tissue located between a first electrode and a second electrode. The electrosurgical system further includes a control unit, which controls the electrical connection between the high frequency high voltage supply unit and the first electrode or the second electrode at the start of measurement during operation of the electrosurgical system. Interrupted and configured to establish an electrical connection between the measurement unit and the first electrode and the second electrode, and at the end of the measurement, the electrical connection between the measurement unit and the first electrode or the second electrode. The connection is interrupted, and the high-frequency high-voltage supply unit is configured to establish an electrical connection between the first electrod
