Seventh International Conference on Electromagnetic Compatibility, 1990

28-31 Aug 1990

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Displaying Results 1 - 25 of 55
  • Development of a system level bench test for the automotive industry

    Publication Year: 1990, Page(s):270 - 275
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    The author describes the experimental work carried out during the early stages of a project aimed at producing a system level bench test for automotive manufacturers and their suppliers. Susceptibility data on two vehicle systems obtained from bulk current injection tests is combined with transfer functions from open field trials and compared with results from radiated susceptibility chamber tests... 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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  • Measurement of the screening effectiveness of a large motor vehicle

    Publication Year: 1990, Page(s):261 - 263
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    A commercial vehicle was subjected to electromagnetic radiation, and the field within the cab was measured. Deductions were then made of the field anticipated at the point of measurement but without the vehicle present and thus the screening effectiveness could be determined. Observations were then made of the magnitude of any resonances which increased the in-cab strength. The commercial vehicle ... View full abstract»

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  • Undergraduate student projects on determining demodulation RFI statistics for operational amplifiers

    Publication Year: 1990, Page(s):253 - 260
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    A team of five undergraduate Electrical Engineering students under the supervision of a graduate student have measured RFI effects in an inverting operational amplifier (op amp) circuit with a voltage gain equal to ten for two sets of input and feedback resistor values. For the first case, the input resistor R1 is 10 kΩ, and the feedback resistor R2 is 100 kΩ. For the second case, R1 i... 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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  • 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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  • 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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  • 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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  • Prediction of PCB radiation in the presence of scattering bodies

    Publication Year: 1990, Page(s):137 - 139
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    Radiation from printed circuit boards (PCBs) is strongly influenced by the presence of other bodies. The aim of this work is to predict such interactions in a realistic environment, such as a piece of computing equipment, and provide a useful software tool for EMC design View full abstract»

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  • Preliminary investigations of coupling between twisted-wire-pairs

    Publication Year: 1990, Page(s):30 - 36
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    Two methods of predicting frequency domain crosstalk in straight- and twisted-wire-pairs in the frequency range 300 kHz to 200 Mz are investigated. The method of Paul and McKnight (1979) is found to give much better quality predictions than that of Belevitch (1977) 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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  • Simulation of transmission line discontinuities for transient analysis in high speed systems

    Publication Year: 1990, Page(s):132 - 136
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors present methods to simulate transmission line discontinuities in the time-domain. The simulation procedures are distinguished by methods that describe discontinuities. To describe the behaviour of discontinuities, a quasi-static approach by lumped elements is used as well as a description by scattering parameters. The latter represents the general approach for the computation of discon... 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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  • 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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  • 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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  • EMC implications of using unshielded twisted pair data busses in the aircraft environment

    Publication Year: 1990, Page(s):184 - 193
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Practical measurement data has been taken from the EMC tests carried out by BAe on a representative ARINC 629 Data Bus system using prototype hardware. The logical approach is given. The purpose of the tests was to establish the emission and susceptibility characteristics of the bus and its prototype interface hardware, and to compare these measured characteristics with the EMC specifications appl... View full abstract»

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  • Common mode current measurements and radiated emissions from long cable systems

    Publication Year: 1990, Page(s):19 - 23
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    Given the size and complexity of the installations which are being measured, currently applied standards are of limited value in assessing their performance. Common mode current measurements for emissions offer an acceptable solution to an otherwise difficult problem. The degree of equivalence between the results quoted suggest that these alternative methods may prove the basis for a standard in t... 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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  • 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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  • Simulation for electrostatic discharges

    Publication Year: 1990, Page(s):177 - 183
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The prime cause of breakdowns in electronic equipment today is still the effect of electrostatic discharges (ESD). The precise and reproducible simulation of such discharges using standardised and internationally recognised procedures is an indispensable tool for improving the quality of an electronic product by identifying potential weak spots during its development, production and/or installatio... 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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  • A critical analysis of the immunity measurement methods for sound and television broadcast receivers

    Publication Year: 1990, Page(s):219 - 226
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    In order to protect the sound and video reception of broadcast programmes, the reduction of radiated and conducted disturbance from electric and electronic equipment, receivers included, is not sufficient. The characteristics of receiver immunity to ambient fields and conducted disturbances should also be very well considered. Emission measurements are not easy, but immunity measurements are more ... View full abstract»

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  • An experimental investigation into the performance of asymmetric screened rooms for electromagnetic measurements

    Publication Year: 1990, Page(s):114 - 118
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    An experimental investigation into the behaviour of asymmetric screened rooms is reported. A qualitative assessment of the theoretical basis is described as justification for the approach. Results are presented which illustrate the validity of the approach in suppressing field strength variations which can also be interpreted as mode control within the chambers. The results presented cover frequen... 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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  • Technical rationale behind the proposed ANSI electrostatic discharge standard

    Publication Year: 1990, Page(s):10 - 15
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    The American National Standards Institute (ANSI) is creating an ESD standard which provides guidance on electrostatic discharge testing procedures for electronic equipment using air discharge and contact discharge methodologies. The ANSI document contains material that has been ignored by other ESD standards and the authors who are ANSI committee members describe the issues which they feel should ... View full abstract»

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