Disclosed is a system comprising a generator and a surgical instrument wherein the generator is configured to deliver a combined signal comprising a radio frequency (RF) component and an ultrasonic component to the surgical instrument and the surgical instrument comprises: an RF energy output an ultrasonic energy output a circuit configured to steer the RF component to the RF energy output and steer the ultrasonic component to the ultrasonic energy output wherein the generator is configured to adjust a frequency of the RF component based on a characterization of a circuit component of the circuit.
