Abstract: A probe unit and a holder of a measurement apparatus that can be releasably connected to one another, particularly without tools, are disclosed. The probe unit includes a mounting device having a contact surface and the holder comprises a counter-contact surface assigned to the contact surface. The contact surface can be divided into multiple separate surface sections that respectively abut along a line or two-dimensionally against the assigned counter-contact surface, if the mounting device takes a contact position. The holding force is produced by at least one mounting magnet of the mounting device and/or at least one holding magnet of the holder. Thereby a magnetic axial force in an axial direction as well as a magnetic circumferential force in a circumferential direction around the axial direction is created, so that the mounting device and holder are urged relative to one another in a desired rotational position in the circumferential direction.

Abstract: A measurement arm receptacle device of a measurement system for releasably arranging a measurement arm. The measurement arm receptacle device comprises a holding device that cooperates with a counter holding device of the measurement arm. The holding and counter holding devices may each comprise at least one retaining magnet. The measurement arm receptacle device comprises an electric contact part movable between a rest position and a working position. In the rest position the contact part is electrically connected with an electric reference potential and in the working position the electric contact part is electrically connected with a measurement arm contact of the measurement arm. Thus it can be unambiguously determined via the contact part, if a measurement arm is arranged at the measurement arm receptacle device and additionally a data carrier of the measurement arm electrically connected with the measurement arm contact can be read out.

Abstract: A measuring system (15) includes a measuring arm receiving unit (18) mounted on the housing (49) or on an axial pin (30) connected to the housing (49) for conjoint rotation so as to be rotatable or pivotable about the axis of rotation (D). A measuring arm (16) can be arranged on the measuring arm receiving unit (18). A motor unit (24) generates a motor torque about the axis of rotation (D) on the measuring arm receiving unit (18). A rotary angle specifying the rotary angle position of the measuring arm receiving unit (18) about the axis of rotation (D) is detected by a measuring device (67) having a scale part (68) and a detection unit (69). The scale part (68) is arranged in the form of a circular arc, annularly, or in the form of a disc about or coaxially with the axis of rotation (D).

Abstract: A measuring system (15) includes a measuring arm receiving unit (18) mounted on the housing (49) or on an axial pin (30) connected to the housing (49) for conjoint rotation so as to be rotatable or pivotable about the axis of rotation (D). A measuring arm (16) can be arranged on the measuring arm receiving unit (18). A motor unit (24) generates a motor torque about the axis of rotation (D) on the measuring arm receiving unit (18). The measuring arm unit (18) is mounted by a ball bearing guide unit (39) to be rotatable about the axis of rotation (D) in the peripheral direction and displaceably along the axis of rotation (D) in the axial direction A. An axial position of the measuring arm unit (18) in the axial direction is defined with the aid of a magnetic axial bearing device (46) and is maintained during operation.

Abstract: A measurement arm receptacle device of a measurement system for releasably arranging a measurement arm. The measurement arm receptacle device comprises a holding device that cooperates with a counter holding device of the measurement arm. The holding and counter holding devices may each comprise at least one retaining magnet. The measurement arm receptacle device comprises an electric contact part movable between a rest position and a working position. In the rest position the contact part is electrically connected with an electric reference potential and in the working position the electric contact part is electrically connected with a measurement arm contact of the measurement arm. Thus it can be unambiguously determined via the contact part, if a measurement arm is arranged at the measurement arm receptacle device and additionally a data carrier of the measurement arm electrically connected with the measurement arm contact can be read out.

Abstract: A measuring system (15) includes a measuring arm receiving unit (18) mounted on the housing (49) or on an axial pin (30) connected to the housing (49) for conjoint rotation so as to be rotatable or pivotable about the axis of rotation (D). A measuring arm (16) can be arranged on the measuring arm receiving unit (18). A motor unit (24) generates a motor torque about the axis of rotation (D) on the measuring arm receiving unit (18). The measuring arm unit (18) is mounted by a ball bearing guide unit (39) to be rotatable about the axis of rotation (D) in the peripheral direction and displaceably along the axis of rotation (D) in the axial direction A. An axial position of the measuring arm unit (18) in the axial direction is defined with the aid of a magnetic axial bearing device (46) and is maintained during operation.

Abstract: A measuring system (15) includes a measuring arm receiving unit (18) mounted on the housing (49) or on an axial pin (30) connected to the housing (49) for conjoint rotation so as to be rotatable or pivotable about the axis of rotation (D). A measuring arm (16) can be arranged on the measuring arm receiving unit (18). A motor unit (24) generates a motor torque about the axis of rotation (D) on the measuring arm receiving unit (18). A rotary angle specifying the rotary angle position of the measuring arm receiving unit (18) about the axis of rotation (D) is detected by a measuring device (67) having a scale part (68) and a detection unit (69). The scale part (68) is arranged in the form of a circular arc, annularly, or in the form of a disc about or coaxially with the axis of rotation (D).