Abstract: A method for checking a rotary bearing of a gantry of a computed tomography system, comprises: rotating a bearing ring about an axis of rotation relative to a supporting structure, wherein at least two structure-borne sound sensors are attached to the gantry; capturing structure-borne sound values via the at least two structure-borne sound sensors while the bearing ring rotates about the axis of rotation relative to the supporting structure; and evaluating the structure-borne sound values to determine whether interference noise beyond a specified interference noise tolerance occurs when the bearing ring rotates.

Abstract: This application discloses cable length measuring apparatus for accurately determining the length of cable at spaced locations by utilizing at least two sets of measuring devices driven by the cable. Electronic switching means receive the length data from each of the measuring devices and processes that data into a command to a cable length marking means. The circuitry of the switch means automatically determines the most favorable instant to cause switching of the measurements of one of the measuring devices to create the command to the marking device to the other of the measuring devices in order to avoid any damage to the cable's jacket because of the switching between the two measuring devices.