A measuring system having a first magnetic field sensor, a second magnetic field sensor, an encoder, and an evaluation circuit to which the first magnetic field sensor and the second magnetic field sensor are connected. The evaluation circuit generates a first signal and a second measurement signal. The encoder generates a second magnetic field change with a second periodicity. The evaluation circuit generates a second signal with the second periodicity from the first measurement signal of the first magnetic field sensor and the second measurement signal of the second magnetic field sensor according to an absolute value function.