Text: A transducer set consisting of a proximity probe and velocity transducer installed radially at the same point (usually in a common housing on the machine casing). Four separate measurements are provided by this transducer system, i.e., the proximity probe measures (1) shaft relative radial position within the bearing clearance, and (2) shaft relative dynamic motion to the bearing. The velocity transducer measures (3) machine casing absolute motion. When the velocity signal is integrated to displacement and summed n time to the shaft summation, it represents (4) shaft absolute motion (relative to free space.)

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