Die Erfindung betrifft einen Hochfrequenzgenerator (12, 12‘) zum Anschluss eines Hochfrequenzelektrochirurgieinstrumentes (14), der in verschiedenen Betriebsmodi zu betreiben ist. Der Hochfrequenzgenerator (12, 12‘) weist einen steuerbar veränderlichen Innenwiderstand und/oder Frequenzgang auf.The present invention relates to a high-frequency generator (12, 12 ‘) for the connection of a high frequency electric surgery instrument (14), which is to be operated in various operating modes. The high-frequency generator (12, 12 ‘) has a controllable variable internal resistance and / or frequency response.