Real-time Measurement and Evaluation System of Electromagnetic Field Emission with Short-time Frequency Conversion Based on Virtual Instrument Technology

In view of the problem of high cost in measuring electromagnetic field emission signals with short-time frequency conversion using the test method stipulated in EMC standard, in this paper, a real-time electromagnetic field emission measurement and evaluation system based on virtual instrument technology is designed. The system mainly includes four parts: measurement sensor, data acquisition and analysis, signal transmission and conversion, display and evaluation. Experiments show that the designed test system can accurately capture the maximum electromagnetic field emission amplitude of short-time frequency conversion signals at each frequency points, and it also has the advantage of obtaining the test and evaluation results in real time.