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A reference test setup to support research and development of HPEM testing schemes
Thorsten Pusch1, Martin Willenbockel2, Tomas Hurtig3, Michael Suhrke1, Sven Ruge1, Michael Jöster4, Benjamin Jörres1
1Fraunhofer INT, Germany; 2Bundeswehr Research Institute for Protective Technologies and NBC-Protection; 3FOI – Swedish Defence Research Agency; 4Private
As an extension to EMC testing procedures covering regulated exposure conditions, schemes for probing immunity of electronic devices against high power electromagnetics (HPEM) have been developed and refined over the years. Several test environments are available, some not yet fully acknowledged in standard documents or laboratory practice. In order to further their development and to facilitate exchange across laboratories and methods, a new reference test setup representing a modern, generic IT system has been designed. Fixed on a styrofoam board, a small single board computer is complemented with digital and analogue periphery. The affordable hardware, compact footprint and battery operation invite for implementation in a variety of use cases. A custom monitoring software visualizes well-defined error conditions under exposure as signaled via optical link. The setup will be detailed together with test results garnered with monofrequent pulsed RF signals between 1 and 2 GHz, showing good reproducibility of a diverse range of error types.
Influence of Power Line Termination Device Placed on Ground Plane to NSA Measurement
1VCCI Council / NEC Platforms, Ltd., Japan; 2Kyushu Institute of Technology; 3VCCI Council
To improve the reproducibility of radiated emission measurement, a very high frequency line impedance stabilization network (VHF-LISN) has been proposed and has been under consideration for standardization into basic measurement standards (CISPR 16-2-3 and CISPR 16-1-4). Since a VHF-LISN can be placed on the ground plane (GP), we thought it was necessary to investigate the effects of placing it. Initially, the effects were investigated by normalized site attenuation (NSA) measurements. The influence of a common-mode absorbing device (CMAD) and an artificial mains network (AMN) were also investigated in the same way for comparison. Then, we created simulation models of antennas and these devices. Both actual measurement results and simulation results demonstrated that the influence of VHF-LISN was smaller than the influence of CMAD or AMN. The results suggest that evaluation of the influence on the NSA of a VHF-LISN placed on the GP is not needed if the evaluation is not required for a CMAD or an AMN.
Influence of Antenna Cabling on Measurement Results below 30 MHz in CISPR 25 Ed. 4 Annex J
Takanori Uno1, Toshiyasu Tanaka3, Koji Maeda2, Hironori Okamoto4, Osami Wada5
1DENSO EMC ENGINEERING SERVICE, Japan; 2Aisin Seiki Co., Ltd.; 3Microwave Factory Co., Ltd.; 4Kansai Electronic Industry Development Center; 5Kyoto University
This paper discusses the effect on the measurement results of the wiring arrangement of an antenna cable with respect to the long wire antenna method specified in CISPR 25 edition 4 Annex J. The experimental results show that the impact on the measurement results still exists even though a setup with multiple ferrites on the cable is used as recommended in Annex J. Measurement results of the Backward Cabling method which positively utilizes the influence of an antenna cable on the measurement system is shown. In addition, the Backside Cabling method which minimizes the influence of an antenna cable on measurement results is proposed. Furthermore, issues related to CISPR 25 edition 4 are considered based on the characteristics of and differences between these two cabling methods.