Researchs About Source-Stirred Reverberation Chamber And Electromagnetic Interference Measuring Receiver In The Field Of Electromagnetic Compatibility Tests

In order to maintain the validity of the EMC test, the test site and the test instruments are the sticking points. In this paper, the researches about the Source-Stirred Reverberation Chamber (SSRC), a new type of test site, and the Electromagnetic Interference Measuring Receiver, the core equipment in EMC tests, are presented, and the details are below:1. Comparing some different kinds of RC from the viewpoints of the theory and realization; Pointing out the shortages in the design of traditional mechanical-stirrer RC, and the merits in the design of SSRC;2. Introducing some RC characteristic parameters, and analyzing the statistical properties of the fields in RC;3. Getting use of the Green Function to obtain the electric field expression in the planar model of the SSRC; making use of the Dyadic Green Function to obtain the electric field expression in the three-dimensional model of the SSRC;4. Analyzing the drawbacks in the SSRC model proposed in this paper, and validating the expressions above and the simulation tools by comparing the result here with that from the other simulation software;5. Based on the expressions above, the theory analysis and the simulation for SSRC is carried out, and the factors, such as the Quality factor, working frequency and the moving range of excitations, are discussed too, those are considered to have impact on the characteristics of RC; The electric field distribution results, coming from MATLAB, validate the stirring effects of the Source-Stirred design, and testify the analysis above: the characteristics of RC improve with the increase of working frequency (dimension of the chamber), with the moving range of the excitation, and with the decrease of the quality factor;6. Providing the configuration of the Electromagnetic Interference Measuring Receiver; Introducing the control system (INTEL 196KC), interface, auto-measure procedure;7. Getting rid of the attenuator for signal below 10dB, and replacing it by the software diagram, which can improve the testing speed obviously;8. Pointing out some key factors for test precision, such as the switch for calibration, calibration source, attenuator and the diode-demodulation.