A power supply device capable of reducing noise intruding into connecting terminals for signal input or output will be provided. In the untwisted portions, one of the conductive lines on each of the twisted pairs is formed with an electrical open. The release element engages by means of an inner release section in the plug-in opening and, for release purposes, acts against the retaining sections of the retaining element. A topic vector process then creates one or more topic vectors from the document vectors. The baffle plate comprises a generally planar, apertured, gas distribution central portion surrounded by a flange, into both of which the cooling passages may extend. During a scanning operation, the control unit controls the probe tip to move in the Z-direction away from the sample surface only when the detection unit detects a variation in the state of vibration of the probe tip.