Method and device for testing of electric motors in particular fan motors for function

The invention relates to an apparatus for and a method of testing of electric motors, in particular fan motors, operability, wherein the received electromagnetic alternating fields formed by the electric motor by means of an antenna, the received signals on signal components in the frequency range of the rotational values ​​of electric motors and its harmonics using analyzing a unit for analysis, and are output in the presence of the functional capability by means of an output unit.