METHOD FOR DETECTING PRESENCE OF A BLADE IN AN ULTRASONIC SYSTEM

摘要

The type of blade installed in a hand piece of an ultrasonic system is determined and the information used to adjust the fault detection threshold of the generato r by using an impedance diagram to determine the type of blade which is connected to the hand piece. A check is performed to determine the magnitude of the blade impedance at resonance. If the hand piece is bare (i.e. no blade is attached), the magnitude of the impedance at resonance is typically less than 125 ohms. If on the other hand, a blade is connected, the impedance will be greater that 125 ohms. This value is used to indicated the presence or absence of a blade.