National Symposium on Electromagnetic Compatibility

23-25 May 1989

Filter Results

Displaying Results 1 - 25 of 87
  • IEEE 1989 National Symposium on Electromagnetic Compatability (Cat. No.89CH2736-7)

    Publication Year: 1989
    Request permission for commercial reuse | |PDF file iconPDF (191 KB)
    Freely Available from IEEE
  • The new SAE J1816 for measurements of narrowband electromagnetic emissions from land vehicles

    Publication Year: 1989, Page(s):279 - 284
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (604 KB)

    The Society of Automotive Engineers (SAE) procedure J1816 `Performance Levels and Methods of Measurement of Electromagnetic Radiation from Vehicles and Devices, Narrowband, 10 kHz to 1000 MHz' is summarized in total and the essential parts of the measurement methods and limits are described specifically. Its contents are listed, and the reasoning behind the methods is explained. The performance le... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Survey of conducted transients in the electrical system of a passenger automobile

    Publication Year: 1989, Page(s):271 - 278
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (484 KB)

    As part of an effort to develop automotive electromagnetic compatibility (EMC) test procedures for evaluating conducted emissions and conducted susceptibility at the component level, an extensive survey of the electrical transients was conducted at various locations within the electrical/electronic system of a late-model automobile. Simultaneous measurements were made at selected potential sources... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Progress in the development of HEMP protection standards for C3I facilities

    Publication Year: 1989, Page(s):52 - 53
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (132 KB)

    A brief summary is presented of US Department of Defense (DOD) efforts for standardizing a high electromagnetic pulse (HEMP) radiation hardening approach for critical fixed ground-based command, control, and communication and intelligence (FGBC3I) facilities. The approach adopted by DOD for hardening FGBC3I facilities is called the low-risk hardening approach. This approach r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Test procedure development for automotive conducted susceptibility and conducted emissions

    Publication Year: 1989, Page(s):263 - 270
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    Current work on electromagnetic compatibility (EMC) requirements for automotive electronic and electrical components has necessitated the development of certain test procedures and specifications for EMC testing within General Motors. In order to support this effort, a study was performed to characterize the internal electromagnetic environment of the automobile. The authors describe the conducted... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effects of corrosion on the electrical properties of conducted finishes for EMI shielding

    Publication Year: 1989, Page(s):46 - 51
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    A variety of combinations of fingerstock materials both before and after exposure to an accelerated atmospheric corrosion environment was tested. The following materials/finishes were tested during this study: 304 stainless steel, passivated, MIL STD QQ-P-35B; 1010 steel, electroplated bright tin, 0.0003 in. nominal coating thickness, ASTM B545; 1010 steel, electroplated nickel 0.0005 in. nominal ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Combining automated monitoring with a national licensing database for radio spectrum enforcement

    Publication Year: 1989, Page(s):228 - 233
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    The Canadian National Licensing Database and Radio Frequency Allocation Plan are used with a specialized culling computer program to generate a list of frequencies to be monitored. This list consists of unassigned frequencies within a geographic area. These frequencies are then loaded into an automated monitoring system which obtains occupancy data under computer control. The onboard computer in t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modeling of electromechanical and electromagnetic disturbances in DC motors

    Publication Year: 1989, Page(s):258 - 262
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (324 KB)

    Electromechanical and electromagnetic disturbances produced by DC motors were modeled using a dynamic electrical network representation that includes a representation of the changing circuit configuration due to the commutation. With this technique the instantaneous current and voltage of each of the armature coils of the motor are computed as is the instantaneous electromagnetic torque developed ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrical stability during vibration and electromagnetic pulse survivability of silver-plated glass bead filled EMI shielding gaskets

    Publication Year: 1989, Page(s):40 - 45
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    Commercial sources of conductive silicone gaskets for electromagnetic interference (EMI) shielding filled with silver-plated glass microspheres were highly stable under conditions of severe vibration and intense simulated electromagnetic pulse (EMP). The results are in contrast to data published by C.H. Kuist (1977) and may demonstrate a considerable advancement in EMI gasket and conductive filler... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The effects of ground screen termination on OATS site attenuation

    Publication Year: 1989, Page(s):166 - 170
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    A description is given of a 10-m open-area test site (OATS) for measuring radiated electromagnetic emissions from computing devices. The test site, located in southeastern Minnesota, is described. Its performance is analyzed by comparing horizontal and vertical site attenuation measured at the site to a theoretical model. The impact of the ground screen is examined by analyzing site attenuation da... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel differential mode rejection network for conducted emissions diagnostics

    Publication Year: 1989, Page(s):223 - 227
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    A differential mode rejection network (DMRN), a device which separates common mode noise from differential mode noise in a line impedance stabilization network (LISN)-based conducted emissions setup, is described. Although it is not a filter, its function is analogous to that of a filter. The DMRN filters out differential mode, and passes common mode unfiltered. The differential mode is attenuated... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Overlapping dyadic drift

    Publication Year: 1989, Page(s):252 - 257
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (264 KB)

    The discrete Walsh transform is defined over a finite interval and produces undesirable blocking effects in digital image processing. It is shown how significant improvement can be obtained in eliminating the blocking problem by introducing the overlapping matrix Q and its false inverse Q¯ for dyadic drift Walsh functions. This is applied to a two-dimensional overlapping sequency filter and a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of wire mesh gaskets with air-inflatable core

    Publication Year: 1989, Page(s):36 - 39
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (264 KB)

    Results are presented from tests of a prototype wire-mesh electromagnetic interference (EMI) gasket with an inflatable core. The gasket is constructed of several layers of wire mesh woven around an air-inflatable rubber core. The wire mesh is made of tin-coated copper-clad steel. It is noted that all testing was performed in an environmentally controlled area. The purpose was to examine the core m... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of flush mounted turntables on site attenuation

    Publication Year: 1989, Page(s):163 - 165
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    When performing various electromagnetic emissions tests, rotation of the equipment under test is often accomplished by the use of turntables. The increasing use of flush mounted metal turntables, instead of above-ground nonmetallic turntables, leads to the problem of how to characterize the interface between the metallic turntable and the ground plane. Several different approaches are used to addr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calibration of antenna factor at a ground screen field site using an automatic network analyzer

    Publication Year: 1989, Page(s):19 - 24
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    Two approaches are described that permit automatic stepped-frequency data acquisition and rapid calculation of several antenna parameters. These parameters include antenna factor, intrinsic gain, realized gain, antenna input impedance, voltage standing wave ratio and site attenuation. The effects of antenna impedance on the meaning and accuracy of antenna measurements are emphasized throughout. Th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • RF upset susceptibilities of CMOS and low power Schottky D-type flip-flops

    Publication Year: 1989, Page(s):190 - 195
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    A description is given of measurements of RF upset levels on two D-type flip-flops, the CD4013B and 54ALS74A, which are functionally identical but fabricated from different technologies: CMOS and low-power Schottky. Continuous-wave electromagnetic interference (CW EMI) from 1 MHz to 200 MHz was coupled into the clock, data, and collector bias, Vcc, ports of each device type whi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of energy in transient overvoltages

    Publication Year: 1989, Page(s):217 - 222
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (484 KB)

    It is argued that the calculation of the energy in a transient overvoltage using the time integral of V2(t)/Z, where Z has the default value of 50 Ω and the voltage, V(t), is that between the hot conductor in the AC line and ground, is inaccurate. A quantitative error analysis is presented that uses an artificial AC line networ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMC and the 20-meter band

    Publication Year: 1989, Page(s):248 - 251
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (236 KB)

    Most of the complaints of interference from amateur radio operation in the United States and Canada involve only a few of the many bands authorized to this radio service. The bands most commonly involved are the popular DX bands at wavelengths of 15 and 20 m. The interference from these bands is almost entirely common-mode on the house wiring due to the close correspondence of wiring to resonant l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of the optical black-hole principle to the estimation of shielding effectiveness to radio frequency energy

    Publication Year: 1989, Page(s):33 - 35
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    The interior of a typical shielded enclosure is usually densely filled with interconnected electronic subassemblies each contained within its own shielded container and pretested to have a specified shielding effectiveness in a free-space environment. The problem of estimating the overall shielding effectiveness when these subassemblies are placed inside the shielded enclosure is discussed. An opt... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experiences in building an open area test site

    Publication Year: 1989, Page(s):157 - 162
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (640 KB)

    The author discusses experience gained from the construction of an open-area test site (OATS) in an urban area with high ambient radiofrequency wave levels. It is shown that a high-quality site (as determined by site attenuation measurements) can be achieved by adhering to basic design practices and using conservative design practices when uncertain. The design approach taken to minimize site anom... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Assessment methodology for radio frequency effects (RFE)

    Publication Year: 1989, Page(s):137 - 142
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (536 KB)

    The concept of radio frequency interference (RFI) is expanded to include RF damage or radiofrequency effects (RFEs). An assessment methodology was developed to predict the RF power density incident on a system that would cause upset or damage to the system electronics. This RFE assessment methodology is based on a modified version of the methodology used for electromagnetic pulse assessments. In t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The effect of dipole coupled impedances on open field range calibration

    Publication Year: 1989, Page(s):16 - 18
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (196 KB)

    The half-wave dipole is the fundamental antenna used in the calibration of open-field test sites. Coupling among the antennas and their images causes a change in antenna center impedance, resulting in a correction of several decibels in the site attenuation model. A derivation of the method of calculating the effect of the coupled impedances is given along with a discussion of the correlations bet... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A cost-effective solution to measurement of hull-generated intermodulation interference on US Navy ships

    Publication Year: 1989, Page(s):186 - 189
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (324 KB)

    Hull-generated intermodulation interference (IMI) signals occur when two or more RF induced currents flow in metallic junctions having nonlinear conduction characteristics. After a brief review of the problem, the approach taken to develop a cost-effective measurement system for IMI on US Navy ships, is described. An automated IMI assessment system approach was developed to allow IMI assessment te... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The effect of duty cycle on SMPS common mode emissions: theory and experiment

    Publication Year: 1989, Page(s):211 - 216
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (420 KB)

    The theoretical time- and frequency-domain waveforms of common-mode conducted emissions are derived for a switched mode power supply (SMPS) of arbitrary duty cycle. The dependence of common-mode emissions on duty cycle and switching frequency is derived, modeled, and verified through experimental data. A special fly-back converter was built to isolate the switching transistor heat-sink parasitic c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modelling interference properties of SMPS DC power distribution buses

    Publication Year: 1989, Page(s):119 - 126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (480 KB)

    The potential for a switched-mode power supply (SMPS) DC distribution bus to create electromagnetic interference (EMI) is examined using the SPICE circuit analysis program. Attaching a SMPS to a long length of transmission line essentially places a time changing load across that line. This generates reflections on the line that result in short periods over which the line voltage can change by a si... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.