Available from IEEE (Cat n 80CH1552-9), Piscataway, NJ p 534-536. ... This system uses a digitally controlled feedback stabilized freuency generator to establish the clocking frequencies for the CCDa#39;s. ... This is accomplished not only through the preventive maintenance/periodic inspection/repair functions that they are so well ... The author recommends preparing a checklist to ensure proper completion of these tasks, to enhance the safety and efficacy of the electrosurgical unit. 5 refs.