An electrical machine comprises a rotor, and a stator magnetically coupled to the rotor. The probe block of the present invention has excellent high frequency responses characteristics and is easy for maintenance. Near a distal end of the separation channel, fluid components travel into distinct first and second outlet channels. If the user selects a destination from the list, points registered in the via-point setting data in the point record of the point selected as the destination are set as candidates for via-points, and the point names thereof are displayed together with the point name of the destination in a via-point editing area. The level shifter circuit enables high frequency operation, providing both fast switching and low capacitance. In one embodiment of the present invention, a method includes forming a plate from a substantially pure aluminum oxide slurry, heating the plate a first time in an oven to sinter the plate, cooling the plate after the heating step, heating the plate a second time to smooth the plate, and cooling the plate after the second heating.