... ultrasonic transducer. sweep Frequency-tracking Separate exitaiton type PCB and Auto excitation type PCB Type: HNE-FP-S(F means frequency,P ... generator with sweep frequency, small-signal remote control, over temperature and over current protection, power adjustable; Type: HNE-FP-A ... power; Example: HNE-40100-A, This model of PCB is auto-excited PCB, applicable to transducer of 40K, 100W.) Power ≤ ...