The system (110) has a coupling element (152) for coupling an analytical aid. A drive unit (160) drives a movement of the coupling element from a rest position to a deployed position. The drive unit comprises an electric motor (162) that generates a rotation movement with different directions of rotation, and a friction clutch with a rotational direction-sensitive element. The friction clutch couples the electric motor to system functions in the directions of rotation. An independent claim is also included for a method for collecting a liquid sample.
