Abstract: The article describes a computer system. Combined with a JES-FE series ESR spectrometer, the computer system can carry out acquisition, processing and simulation of measured data The system consists of an IBM-PC microcomputer, an interface, consisting of the timing controller and A/D converter, and application software.The sampling and the signal average can be made by the system in very wide range of sweep time(lms-128 min).It improved greatly the ESR spectrometer in measuring the short life free radicals and the weak signal. The system is on a level with ES-PRIT23 in main functions and specifications, but it costs only one fifth of that of ES-PRIT23.

Key words: Computer system, ESR spectrometer