2007 ieee international symposium on electromagnetic compatibility

10EMC <strong>2007</strong> ADVANCE PROGRAMThe electro-optical modulator based on Pockels effect implementsthe transition from electrical signal to optical signal. This makesusing optical fiber in EMC measurements come true. This paperdescribes the principle of modulators based on Pockels effect, designsthe modulator with high precision, calculates the electric field in themodulator, discusses the parameters of the modulator, and gives theequivalent electrical circuit.The Development of Integrated Electro-optic Sensor forIntensive Electric Field MeasurementRong Zeng; Weiyuan Chen; Jinliang He; Puxua Zhu; Xiaolin Li; and QiWang, — Department of Electrical Engineering, Tsinghua UniversityIn order to meet the special demands of impulse electric field measurementsimultaneously, such as intensive signal, fine insulation,transient, wide frequency band, and small size, three kinds of opticalelectric integrated electric field sensor were designed and fabricated.The output/input character and frequency response of the sensorswere examined carefully. It can be found that the measurable amplitudeof two traditionally designed sensors is less than 80 kV/m,which is not suitable for intensive electric field measurement. But anovel sensor designed here is suitable for insulated, intensive (about300kV/m) electric field measurement. And the application of which,in the lightning impulse experiment upon air gap, ensures that thesensor can be expected to be in widespread use in transient intensiveelectric field measurement investigations.Basis for a Wireless Network for EMC Measurements inElectric SubstationsW. H. Siew, University of Strathclyde; Karl Liu, N/A; Bukar Musa, N/A;Yu Wang, N/A; and Faheem Mir, N/ASwitching operations of power equipment, such as disconnect switchand circuit breakers in high voltage substations, produce high frequencytransient currents which propagates along the busbars. Thebusbars then act as antennae, producing transient electromagneticfields in the switchyards. In electromagnetic compatibility (EMC)considerations, the resulting fields are important sources of electromagneticinterference (EMI); moreover, highly sophisticated, newtechnology equipments are being introduced into the substationsenvironment for measurement, control, protection, and communicationpurposes. These equipments are located close to the switchingequipments in the switchyards, hence to establish the EMC of theequipment it is desirable to quantify this high voltage environment.This paper describes a new digital wireless measurement systemwhich is based on Bluetooth technology that can be used in powerstations or other similar harsh environments. It comprises a RemoteAcquisition Unit (RAU), a Wireless Data Communication Network(WDCN) and a PC-based Control Platform. The performance andcapability of the system is assessed against another measurement systembased on fiber optics technology and found to be more portable,easier to install, and cheaper than the latter. The limitations of thewireless system are considered and ways of addressing them in furtherresearch are discussed.On the Selection of Telecommunication Port ImpedanceStabilization Networks (ISNs)David Arnett, Hewlett Packard Company; and Edward Blankenship,Hewlett Packard CompanyWhen measuring telecommunication port conducted disturbances on10BaseT or 100BaseT Ethernet, test labs will find different testresults based on whether they select an ISN for two differential pairsor for four differential pairs. This paper discusses the reason why testdata from the two ISN designs will sometimes agree and sometimesdiverge.Electromagnetic Compatibility Lack in Measuring Devicesand Quick Passive Detection MethodMarian Soinski; Roman Rygal; and Wojciech Pluta, — CzestochowaUniversity of Technology; and Piotr Kepski, Research & Development OfficeStrong stationary magnetic fields from permanent magnet, or strongelectromagnetic fields from many different sources, when used in awrong way, can change a proper behavior in already optimized technicalequipment. For example, many electronic electrical energymeters do not correctly count the consumption of electrical energy, orlow-voltage current transformers do not indicate proper levels of outputsignal. This is evidence of a lack of electromagnetic compatibility(EMC). To prevent the described situation from happening, someactions have to be taken. This paper outlines the problem and proposesa possible solution to the phenomenon of illegal use of thedescribed lack of EMC.EMC TEST FACILITIES AND ANTENNASA Critique on Traceability in Site Validation MeasurementsZhong Chen, ETS-Lindgren; and Achim Enders, Technical University atBraunschweigSite validation measurement procedures are specified in ANSI C63.4and ANSI C63.5 in the U.S., and CISPR 16 <strong>international</strong>ly. The metricsfor site performance for both standards is the site attenuation deviationor normalized site attenuation deviation. However, the (normalized)site attenuation deviations measured according to these standardsfor the same site-under-test are non-unique, leading to ambiguitiesin the reference for traceability. Because the antennas used for siteattenuation measurements are not specified, the variety of allowedantennas have a non-negligible effect on site-attenuation deviations.The main variable antenna characteristics which directly influence theapparent site response are different antenna balun impedances, differentnear-field coupling effects for different antenna elements, and differentfar-field radiation patterns. Results are presented for theseinfluencing factors to show that several dB variations in site attenuationdeviations can be obtained for the same site. Consequently, standardsdevelopment organizations are suggested to (re-)consider specifyingand adopting some type(s) of reference antenna(s).Extracting Useful Information from Radiated Emission TestSite NSA and VNSA Data SetsEd Blankenship; David Arnett; and Gary Town; Hewlett-PackardCompany; Derick Skouby; and Henry Benitez, — ElectroMagneticInvestigations, LLCThis paper explores historical and technical details of the radiatedemission site attenuation techniques. We give an example of additionalinformation beyond pass/fail that can be gleaned from theresults. Our research demonstrates two ways to investigate test siteanomalies, using variations on the standard site attenuation method.Verification of an EMC Facility Retro-Fit using Time-Domainand Field Uniformity MeasurementsDennis Camell, National Institute of Standards and Technology (NIST);Michael Taylor, Hach Co.; Robert Johnk, NIST; and Ben Davis, NISTThis paper summarizes a joint NIST-Industry measurement effort.Time-domain and field uniformity measurements are used to verify aretro-fit of RF absorber in an EMC Compliance Chamber from 30MHz to 6 GHz. Time gating and dense frequency packing of inser-©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org