The invention relates to a medical workstation and an operating device (1) for the manual movement of a robot arm (M1-M3). The operating device (1) comprises a controller (5) and at least one manual mechanical input device (E1-E3) coupled to the controller (5). The controller (5) is designed to generate signals for controlling a movement of at least one robot arm (M1-M3) provided for treating a living being (P) based on a manual movement of the input device (E1-E3) such that the robot arm (M1-M3) carries out a movement corresponding to the manual movement. The input device (E1, E2) comprises at least one mechanical damping unit (27, 40), which generates a force and/or torque during a manual movement of the input device (E1, E2) for at least partially suppressing a partial movement resulting from a tremor of the person operating the input device (E1, E2).