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This paper describes the implementation of mode-stirred method for susceptibility testing according to the current DO-160D standard. Test results on an Engine Data Processor using the implemented procedure and the comparisons with the standard anechoic test results are presented. The comparison experimentally shows that the susceptibility thresholds found in mode-stirred method are consistently higher than anechoic. This is consistent with the recent statistical analysis finding by NIST that the current calibration procedure overstates field strength by a fixed amount. Once the test results are adjusted for this value, the comparisons with the anechoic results are excellent. The results also show that etst method has excellent chamber to chamber repeatability. Several areas for improvements to the current procedure are also identiified and implemented.
This paper describes the implementation of mode-stirred method for susceptibility testing according to the current DO-160D standard. Test results on an Engine Data Processor using the implemented procedure and the comparisons with the standard anechoic test results are presented. The comparison experimentally shows that the susceptibility thresholds found in mode-stirred method are consistently higher than anechoic. This is consistent with the recent statistical analysis finding by NIST that the current calibration procedure overstates field strength by a fixed amount. Once the test results are adjusted for this value, the comparisons with the anechoic results are excellent. The results also show that test method has excellent chamber to chamber repeatability. Several areas for improvements to the current procedure are also identified and implemented. Nguyen, Truong X. and Ely, Jay J. and Koppen, Sandra V. Langley Research Center NASA/TM-2001-211033, NAS 1.15:211033, L-18093
This study summarizes the results of an experiment designed to determine the effectiveness of using frequency stirring to provide field homogeneity in a reverberation chamber. Frequency stirring is accomplished by up-converting band limited white Gaussian noise to microwave frequencies and thus exploits both the high mode densities achievable in a narrow bandwidth at microwave frequencies and the pseudo-statistical nature of the reverberation chamber's eigenmodes. The ultimate goal is to replace the mechanical stirring devices currently used in reverberating chambers with an equivalent electronic eigenmode stirrer. In addition, an expression for the net Q of a reverberation chamber is developed which includes the effects of antenna loading; methods for predicting the homogeneity of the resulting fields in the chamber after application of the frequency stir technique are proposed; and a theoretical basis for interpreting fringe power density levels, cross sections, and shielding effectiveness measurements is also given.
The definitive reference on electromagnetic shielding materials, configurations, approaches, and analyses This reference provides a comprehensive survey of options for the reduction of the electromagnetic field levels in prescribed areas. After an introduction and an overview of available materials, it discusses figures of merit for shielding configurations, the shielding effectiveness of stratified media, numerical methods for shielding analyses, apertures in planar metal screens, enclosures, and cable shielding. Up to date and comprehensive, Electromagnetic Shielding: Explores new and innovative techniques in electromagnetic shielding Presents a critical approach to electromagnetic shielding that highlights the limits of formulations based on plane-wave sources Analyzes aspects not normally considered in electromagnetic shielding, such as the effects of the content of the shielding enclosures Includes references at the end of each chapter to facilitate further study The last three chapters discuss frequency-selective shielding, shielding design procedures, and uncommon ways of shielding—areas ripe for further research. This is an authoritative, hands-on resource for practicing telecommunications and electrical engineers, as well as researchers in industry and academia who are involved in the design and analysis of electromagnetic shielding structures.