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Seventh International Conference on Electromagnetic Compatibility, 1990

28-31 Aug 1990

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Displaying Results 1 - 25 of 55
  • EMC certification and accreditation programs in the US Navy

    Publication Year: 1990, Page(s):248 - 252
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The approach that was proposed by the US Navy has focused on the need for accreditation in two areas of EMC technical support, personnel providing direct technical support and laboratories doing MIL-STD-462 acceptance testing. Certification of personnel to a recognized and widely accepted standard would provide a basis for assuring that contractors and their Government counterparts were competent ... View full abstract»

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  • The Masterclass-teaching EMC in industry

    Publication Year: 1990, Page(s):243 - 247
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    To raise the awareness and technical ability of design engineers, Rolls-Royce and Associates (RRA) has started an in-house teaching programme to propagate the considerable experience existing within the Company. The lecture programme is based on this experience and the knowledge of senior engineers within the Company and is called the Masterclass. The author looks at the various technical needs of... View full abstract»

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  • A university postgraduate course in EMC

    Publication Year: 1990, Page(s):240 - 242
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    In preparation for the forthcoming EC legislation, UK electronics and electrical industries and industries whose products incorporate electrical or electronic elements will need a much higher level of expertise in electromagnetic compatibility than is currently available. The main objective of the MSc course described is to produce engineers whose knowledge of EMC will enable them to make importan... View full abstract»

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  • Induced fast transients in multiconductor shielded cables

    Publication Year: 1990, Page(s):103 - 108
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    The coupling of fast transient electromagnetic fields to lossy multiconductor shielded cables is considered. Calculation of the transient responses calls for the development of models simulating the cable, the incident field and the impressed sources. Accurate models are developed to simulate a multiconductor cable with a multilayer braided-shield and multiple parallel inner conductors or twisted-... View full abstract»

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  • Earth heterogeneity effects on the buried cable vulnerability to lightning

    Publication Year: 1990, Page(s):294 - 300
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors analyze the effect of the earth heterogeneity on the surges induced within buried cables by a nearby lightning discharge. A general formulation for the lightning induced electromagnetic fields in a multilayer Earth is developed in frequency domain by using a monopole technique. This technique is performed by the use of the so called modified transmission line model. Furthermore some nu... View full abstract»

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  • The vehicle body as an electromagnetic shield-numerical simulation for emission and susceptibility studies

    Publication Year: 1990, Page(s):125 - 131
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    In understanding EMC in vehicles it is necessary to review briefly the external and internal environment. The external environment is either a test environment or an environment typical of road conditions. Examples of the former are EMC compliance tests in screened or anechoic rooms. The internal environment of the car can be described as a leaky metal cavity loaded with a variety of materials, e.... View full abstract»

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  • An improved method for the performance evaluation of radiated emission test sites by a comb generator reference radiator

    Publication Year: 1990, Page(s):144 - 151
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    A fully automatic, computer-controlled site performance evaluation technique has been developed. This technique is capable of calibrating test sites for radiated emission testing of actual equipment. An important advantage of the technique is that calibrations are not limited to fields of dipole antennas, as in the concept of normalized site attenuation. The calibrations are carried out using fiel... View full abstract»

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  • First year graduate level course in electromagnetic combatibility

    Publication Year: 1990, Page(s):232 - 239
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    Presents new ways for teaching such EMC topics as common and differential mode currents, shielding, and wire-to-wire/field-to-wire coupling methods. The objective is accomplished by first bringing `the computer age' to the teaching of EMC/EMI. Some of the basic concepts of electromagnetic compatibility are covered by studying the approaches which several successful EMC modeling programs have used ... View full abstract»

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  • Convenient current-injection immunity testing

    Publication Year: 1990, Page(s):173 - 176
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    Describes a hand-held clamp-on current-injection tester intended for informal use. To minimise test time and to maximise the chances of finding susceptibility modes a wide range of frequencies and modulations is generated simultaneously. To ensure reproduceability current feedback from an independent transducer is provided View full abstract»

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  • A simple model of intermodulation spectra for use on a personal computer

    Publication Year: 1990, Page(s):99 - 102
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    The authors describe initial work undertaken to characterise, from an EMC point of view, the RF environment in highly cluttered industrial site environments where a large number of radio systems may be present. The initial work involves bringing together existing methods and implementing these methods in an efficient manner on a personal computer. Further work involving calibration of the model ag... View full abstract»

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  • Radiated emission, susceptibility and crosstalk control on ground plane printed circuit boards

    Publication Year: 1990, Page(s):37 - 41
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    In the case of conductors of finite width and with dielectrics of finite thickness it is shown that the closeness of the inductive coupling between conductor and ground plane is important in minimising the equivalent loop area at high frequencies. Alternating currents tend to follow a path which encloses the least magnetic flux, but in the case of a ground plane return it may be difficult to belie... View full abstract»

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  • Effective lightning protection

    Publication Year: 1990, Page(s):287 - 293
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    The author presents the lightning protection problems both in general terms and as a technical evaluation. He shows the importance of both the requirements of the protection units and their placing in a typical installation. A thorough understanding of lightning protection requirements is developed, removing the misconceptions that currently exist within the electrical industry regarding protectio... View full abstract»

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  • Screening performances of triaxial cables with optimum braided shields

    Publication Year: 1990, Page(s):24 - 29
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    The author investigates the shielding effectiveness of triaxial cables employing optimum designs for braids in their inner and outer shields. This is done by calculating the time and frequency domain responses of inner-most line to the fields induced on the shield of the outer line. For most optimised braids, transfer admittance is in the same order of transfer impedance and thus both of these par... View full abstract»

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  • Development of the US Navy's PC-based Frequency Assignment Computer Terminal System

    Publication Year: 1990, Page(s):276 - 280
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB)

    In the past the US Navy's frequency records were kept either on microfiche or printed out on paper, and modifications and new assignments were penciled in on three-by five cards. This method of managing the spectrum became conspicuously archaic with the advent of computers that could perform EMC calculations and multiple frequency record transactions. To remedy this problem the US Navy, through th... View full abstract»

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  • Regulations standards and specifications relating to the implementation of the EMC Directive within the United Kingdom

    Publication Year: 1990, Page(s):16 - 18
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The authors examine the requirements necessary for compliance with the new approach EMC Directive No. 89/336/EEC. They describe the development of CEN/CENELEC standards and discuss generic standards, product specific EMC standards, transitional arrangements and the implications of the EMC directive View full abstract»

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  • Evaluation of a missile body EMI gasket

    Publication Year: 1990, Page(s):264 - 269
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    A small missile body is being constructed from a series of interlocking sections made from aluminium alloys. Between each section an EMI gasket is fitted to ensure continuity of screening for the whole missile. The author describes how the electrical performance of this gasket has been determined both before and after exposure to a severe corrosive environment. A test method based on a measurement... View full abstract»

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  • A novel technique for damping site attenuation resonances in shielded semi-anechoic rooms

    Publication Year: 1990, Page(s):119 - 124
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    Presents a simple and economical technique for suppressing resonance problems in shielded semi-anechoic rooms (SSARs). The work described is an application to an SSAR of a technique developed by Dawson and Marvin for small shielded enclosures. It consists of putting lossy dielectric blocks at well-selected positions where the electric fields of the problem-causing resonant modes show up a maximum.... View full abstract»

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  • Computer aided design for radio-frequency interference reduction

    Publication Year: 1990, Page(s):140 - 143
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    Describes the requirements for a computer aided design (CAD) package to predict radiated emissions from electronic equipment and to aid their reduction. Input for the package is obtained from a suite of CAD tools covering electrical and mechanical aspects of electronic equipment design. An electromagnetic solver using a method of moments technique is described and its current performance is indica... View full abstract»

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  • A high field strength low-cost component susceptibility test facility

    Publication Year: 1990, Page(s):227 - 231
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    One method of determining the immunity to electromagnetic radiation of an electronic system is to subject it to a transverse electromagnetic (TEM) wave which is propagated between two parallel conductive plates. Techniques are described here which have been used to increase the maximum attainable field strength within such a parallel plateline, while using the same amplifier output power, and to r... View full abstract»

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  • Co-ordination of IEC standards on EMC and the importance of participating in standards work

    Publication Year: 1990, Page(s):1 - 6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The author describes the coordination of EMC work that is being undertaken by the IEC, involving its own Technical Committees, specialized international organizations and, increasingly, CENELEC (European Committee for Electrotechnical Standardization) View full abstract»

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  • Helmholtz coils for EMI immunity testing: stretching the uniform field area

    Publication Year: 1990, Page(s):169 - 172
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    Helmholtz coils are used to establish known, uniform magnetic fields for calibrating magnetic field sensors, for EMI immunity testing, for magnetic bioeffects research, etc. But in the past, it has been assumed that only very small devices could be tested. The paper provides information leading to an understanding of the size of the uniform field region and how to trade off field uniformity for in... View full abstract»

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  • Onboard aircraft measurements and techniques for whole aircraft EMC clearance

    Publication Year: 1990, Page(s):204 - 210
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Provides an overview of the state-of-the-art measurement techniques used to assess the electromagnetic compatibility between various systems onboard a modern aircraft. Avionic equipment susceptibility assessments and wiring loom induced current measurements are carried out using aircraft onboard transmitting systems. Bulk current injection techniques (BCI) are applied to the aircraft wiring looms ... View full abstract»

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  • A mathematical model of concentrically loaded coaxial structures and its EMC applications

    Publication Year: 1990, Page(s):91 - 98
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    Computer programs have been developed at Bristol University for modelling boxed microstrip lines. Modules from these programs have been modified and extended to produce a program which can model any uniform, symmetric, coaxial system that has multiple concentric dielectrics. The program has also been extended to model losses through the use of complex permeability and permittivity values for the d... View full abstract»

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  • Remarks to the solution of EMC-problems on printed-circuit-boards

    Publication Year: 1990, Page(s):68 - 72
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The author gives a survey of the PCB design process under EMC constraints. For a better understanding of the PCB design process with respect to EMC problems the standard design process is discussed first. Based on this discussion an alternate design process including EMC problems is defined. For this approach the PCB design problems are classified first. After this discussion the present state of ... View full abstract»

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  • The implementation of the EMC Directive

    Publication Year: 1990, Page(s):7 - 9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    The author sets the EMC Directive in its context in the new approach, describes the main features of the Directive and outlines some of the issues arising from its implementation in the UK View full abstract»

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