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Large turbine generator sets which are highly efficient operate at high temperatures. Consequently through operational cycles they suffer stresses due to the resultant contraction and expansion of the constituent parts. These, together with the effects of thermal transients, can give rise to both radial and longitudinal vibrations in the set. Real-time computer-based vibration monitoring equipment with VDU and keyboard has been designed to allow a watch to be kept on the performance. The apparatus and its operation are fully described. The reasons for various decisions-for example, the choice of eddy current probes-are looked at, the alarm strategy is discussed, data analysis and storage are examined, and an equilibrium algorithm is briefly outlined. Some case studies covering various faults-unbalanced rotation, Mathieu friction, for instance-are given, with diagrams of the appropriate VDU display. In the first stage six equipment are operational and another 25 will be installed.