Method and device for machine diagnostics, and more particularly to the transmission diagnosis

The present invention relates to a method and an apparatus for machine diagnostics, and more particularly to the transmission diagnosis for a machine or a vehicle. The measuring system according to the invention includes on a bobbin (11) wound coil (2), on the surface attach to be detected ferritic abrasive particles (3). Opposite the coil (2), a rotating gear wheel (6) is arranged, which influences the inductance of the coil (2). The output signal of the coil (2) has pulses with a constant amplitude, whose frequency depends on the rotational speed of the gear (6). Deviations in the amplitude level are attributable to the addition of ferritic abrasive particles (3) on the coil (2), and therefore a measure of the state of the engine or the transmission.