ENCODER ERROR DETERMINATION

摘要

A rideheight sensing device is described for providing a measure of the separation between the readhead portion (40) and the scale (10) of an encoder. The rideheight sensing device comprises a rideheight sensor (41; 42; 46; 50) that is located at, or is attachable to, the readhead portion (40) of an encoder. The temporary, or permanent, attachment of such a device to the readhead portion (40) of an encoder is also described. In a preferred embodiment, a rotary encoder is described and the rideheight sensing device is used to measure the eccentricity thereof.