Abstract: In a system for monitoring the condition of a machine by vibration analysis, including at least one vibration sensor in operative contact with the machine for sensing machine vibrations, and for providing a vibration signal at its output, a sampling device connected to the output of the vibration sensor for sampling, amplifying and digitizing the signal obtained from the vibration sensor, a frequency analyzer arranged to receive the sampled and digitized signal from the sampling device, and a pattern recognizer coupled to the frequency analyzer for detection of any abnormal frequency spectra, the improvement includes a data processing unit adapted to store control programs, which in turn is connected to the vibration sensor, and includes a microcomputer inclusive of a random access memory, for obtaining vibration data from the sensor, and for storing the vibration data in the form of a time series in the memory, a central monitor remote from the data processing unit adapted to store another program therein, i