The invention describes a device and a method for detecting turn-to-turn faults in the laminate stack (5) of a stator (1) of an electrical machine or a generator. In this case, the stator (1) is magnetized for the measurement by means of an auxiliary coil and an auxiliary current and the magnetic field (7, B) is measured by a pickup device (S1,S2,S3). The pickup device has (S1,S2,S3) at least two detectors (S1,S2,S3), which are arranged in two different radial positions with respect to the rotor axis (3), at the same time measures the magnetic field (7, B) in these two different radial positions with respect to the rotor axis (3). The two signals (10) measured at these different locations are evaluated and compared with one another in terms of magnitude and/or in particular in terms of phase angle for detecting turn-to-turn faults.
