Automated spectrum analysis

Automatic spectrum analyzers (ASA's) combine a powerful RF measurement system with computer control and data processing. This article discusses a typical ASA block diagram (analog and digital subsystems), shows how the calibration procedures used in such systems enhance the accuracy of measurements, and discusses some of the problems with current ASA systems. The present use of ASA systems in government and industry is illustrated with several examples of ASA systems used in production testing of large electronic systems, measurements of the electromagnetic environment, communication satellite monitoring, and EMC testing. Finally, alternate technologies for making spectrum measurements and the future of ASA's are discussed.