Disclosed is a method and a phased array inspection device enabling calibration of the device with an optimized pulse rate, the pulse rate is derived based on the true adaptive value of the impedance of the specific phased array probe circuit or the pulser circuit and the circuit energy consumption limitations. A power takeoff supported by the body clamped to the power line generates direct current from alternating current flowing in the power line. First and second transistor control terminal potentials. The piston divides the interior space of the canister into an air chamber and a fluid filled chamber.