I need a conversion table or formula for vibration units, say microns, mm/sec or whatever. My mail address will do.

Thanks.

I presume your accelerometers are mounted externally and will therefore measure the ‘seismic’ or overall vibration of the complete bearing assembly. This is not necessarily the same as the movement of the shaft internally. Most of the energy measured externally will be related to movement of the shaft but will be influenced by various effects such as the bearing stiffness in the direction in which the transducers are mounted. To measure the actual movement or orbit of the shaft in the bearing you will need to use non-contact shaft displacement probes.

Basically the operation is the same in that the voltage applied to the driver creates an RF signal which is transmitted to the probe tip by a tuned extension cable. There is a coil in the probe tip which generates an electromagnetic field. Any conductive material in this field will have eddy currents setup in its surface which absorb the energy and cause the output of the probe to decrease proportional to distance between the probe tip and the target. If the target is very close to the probe tip then the absorbtion is high and the output of the probe is greatly reduced (zero when touching). If the target is very far away then the absorbtion is less and the probe output is close to its drive voltage.