The present invention provides methods for operating data loggers and in particular, software techniques useful for controlling the critical functions of a low-power-battery-operated data logger. The wire cleaning system includes a chamber through which a wire configured to be wirebonded extends prior to the wire being wirebonded. The first conductor, the second conductor, and the third conductor are provided in a first conductive region, a second conductive region, and a third conductive region in the housing respectively, wherein the projection regions of the first conductive region and the second conductive region in the normal direction of the housing are overlapped. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims. The pole shoe arrangement has a guiding facility to guide the permanent magnet in a radial direction from the outer end to the inner end and to limit a movement of the permanent magnet at right angles to the radial direction.