National Symposium on Electromagnetic Compatibility

23-25 May 1989

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

    Publication Year: 1989
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    Freely Available from IEEE
  • HDL CW instrumentation system

    Publication Year: 1989, Page(s):406 - 409
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The Harry Diamond Laboratories continuous wave instrumentation system (HDL/CWIS) was developed for studying electromagnetic pulse effects on a variety of equipment. The system consists of the electromagnetic field generating and data collecting/processing equipment. The data acquisition system and the physical and electromagnetic properties of the system are discussed. Field-mapping data and respo... View full abstract»

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  • A method for interlaboratory stripline susceptibility test calibration

    Publication Year: 1989, Page(s):90 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    A method is presented for correlating susceptibility tests between two different electromagnetic compatibility (EMC) laboratories using stripline antenna test methods by utilizing similar test antennas. A controlled test antenna is used along with swept frequency techniques to gather data rapidly which are then used to correlate results from two or more laboratories or to locate and eliminate the ... View full abstract»

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  • The improvement of the resonance in RFI chamber

    Publication Year: 1989, Page(s):400 - 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Reported improvements in resonances observed in a semianechoic radio frequency interference (RFI) measurement chamber are discussed. Due to the chamber's construction details and antenna placement, for 90 MHz measurements one point within the chamber had decreased electric-field intensity while another point showed the opposite. After lining the chamber's ceiling and for walls with about 13000 fer... View full abstract»

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  • Excitation of aircraft for hardness surveillance using the aircraft's own HF antenna

    Publication Year: 1989, Page(s):87 - 89
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A technique is reported for testing the electromagnetic radiation hardening of aircraft. The electromagnetic excitation of the aircraft is accomplished by driving the aircraft's high-frequency (HF) antenna at the fundamental resonant frequency of the aircraft. Surface magnetic fields in the range of 1 to 10 mA/m were easily produced with 15 W of RF power. In addition to exciting the fundamental re... View full abstract»

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  • Improved low-frequency performance of pyramid-cone absorbers for application in semi-anechoic chambers

    Publication Year: 1989, Page(s):394 - 399
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A mathematical model, developed by the authors to describe the low-frequency reflection properties of arrays of pyramid-cone absorbers, is used to improve the design of these cones in the range of 30 to 300 MHz. The model shows that at frequencies such that the transverse spacing of the cones is small compared to a wavelength, a reflecting wave is not influenced by the individual cones, but rather... View full abstract»

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  • Congruence of low voltage power main transient designs

    Publication Year: 1989, Page(s):285 - 293
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    It is argued that the conditions and problems for high-voltage protection in the 1920s to 1940s are similar to those prevailing today for low-voltage (under 1000 V RMS) power system transient protection. Data are now being collected beyond voltage crest values vs. occurrence rate such as: waveshape epoch, rate of rise, ringing periods, energy, and energy spectral density. Protection design is comp... View full abstract»

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  • 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»

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  • Computation of intermodulation and interference in telecommand due to the ranging signal of the ESA multi purpose tracking system: lack of degradation

    Publication Year: 1989, Page(s):437 - 441
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The performance of the European Space Agency (ESA) spacecraft telecommand subsystem due to simultaneous ranging is analyzed. The use of the ESA multipurpose tracking system, which represents an improved version of the deep space tracking system, is assumed. Numerical results show that the telecommand bit error rate degradation is negligible and that the frequency optimization proposed by T.M. Nguy... View full abstract»

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  • R2SPG-a new technique for measuring upset susceptibility thresholds of large systems

    Publication Year: 1989, Page(s):83 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An in-situ system-level upset test technique has been developed that uses a random repetitive square wave pulse generator (R2SPG) as a broadband simulator. In the proposed technique current is inductively coupled to cables or cable bundles and is easily controllable from amplitudes of 10 mA to 16 A peak-to-peak. The waveform is a broadband transient that approximates a damped square wav... View full abstract»

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  • Advances in understanding of EM emissions from computing devices

    Publication Year: 1989, Page(s):360 - 362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The authors outline mechanisms by which computing equipment acts as a source of electromagnetic (EM) emissions containing information conducted away from the source through various paths (conductive or radiative or both). A brief summary is given of a receiver to display the information that has radiated away from the source. The receiver is constructed using only commercial components. The device... View full abstract»

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  • DC magnetic field effects on shadow mask color cathode-ray tube (CRT) performance

    Publication Year: 1989, Page(s):315 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Electromagnetic interference testing of video equipment reveals that both monochrome and color cathode-ray tube (CRT) monitors are susceptible to picture distortions due to DC magnetic fields. The most common commercially available color CRTs use shadow mask technology. These CRTs, however, are the most susceptible to DC magnetic fields due to their precise alignment requirements for color converg... View full abstract»

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  • Radiated emission measurements in completely absorber-lined anechoic chambers without groundplanes

    Publication Year: 1989, Page(s):390 - 393
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A technique is presented for radiated-emission tests in completely absorber-lined chambers which are equipped with floor absorbers instead of groundplanes. Data measured in a completely absorber-lined chamber can be converted to open-site equivalents with an accuracy of ±0.5 dB (30-1000 MHz) by applying the conversion factors given. The great advantage of this technique is that tests are pe... View full abstract»

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  • 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»

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  • 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»

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  • A novel differential mode rejection network for conducted emissions diagnostics

    Publication Year: 1989, Page(s):223 - 227
    Cited by:  Papers (30)
    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»

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  • Criteria and designs for surge couplers and back-filters

    Publication Year: 1989, Page(s):202 - 207
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A review is presented of the principal areas in which surge coupling and filtering problems exist. It is proposed that each coupling mode be described in terms of the displacement of every line in the system with respect to ground. Rules are developed for specifying and designing surge coupling configurations, so that different surge test equipment can produce the same test results for a given pie... View full abstract»

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  • Detuning free-standing towers at MF frequencies

    Publication Year: 1989, Page(s):431 - 436
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Many commercial AM broadcast antennas must maintain a directional pattern to avoid interference with other stations on the same frequency. Scattering of the station's signal can lead to field strengths in excess of those stipulated by the station's licence; free-standing towers scatter the signal effectively if the tower height is comparable to the quarter-wavelength. In the paper, means of suppre... View full abstract»

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  • Radiated emission and susceptibility EMI testing: the advantages of conducting unit level tests in a system level environment

    Publication Year: 1989, Page(s):77 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The author suggests that time and money could be saved and more meaningful electromagnetic interference (EMI) test results could be obtained if existing MIL-STD EMI test procedures were modified to permit cabinet (unit) level testing to be conducted while having the total system electronics interconnected in a system-level environment. He proposes a concept in which electronic systems consisting o... View full abstract»

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  • The effect of cable terminations on EMI measurements

    Publication Year: 1989, Page(s):357 - 359
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The effects of using uncontrolled or undefined cable terminations during electromagnetic interference (EMI) measurements was investigated. Several different models are described along with corresponding measurements in order to illustrate how specific terminations can be used to achieve particular measurement goals. It is noted that until a well-defined method of terminating power and signal cable... View full abstract»

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  • Characterization of the EMP response of cable and shelter network

    Publication Year: 1989, Page(s):97 - 100
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The electromagnetic pulse (EMP) response of system cables and antennas can be affected by their connection to an electrical equipment shelter. Results are reported for a typical shelter utilized by the US Army that was experimentally characterized. Measurements were made of cable responses with and without a shelter connection using a radiating EMP simulator. Additional testing was performed to de... View full abstract»

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  • The graphical attenuation calculation methodology

    Publication Year: 1989, Page(s):299 - 302
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A graphical technique for predicting the attenuation of a filter is described. The method centers around impedance paper and the use of several simple identities and is capable of solving for the attenuation of any multisection filter. The advantage of the method is that it gives the engineer intuitive insight into the operation of the filter, and possibilities for improvement. The weakness of the... View full abstract»

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  • Wideband RF-leakage test method for cables

    Publication Year: 1989, Page(s):367 - 372
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Electromagnetic leakage from coaxial cables, (i.e. shielding effectiveness of coaxial cables) was successfully measured as an absolute value over a frequency range from 4 GHz to 18 GHz using a simple, compact test system composed of parabolic cylinder reflector antennas. In combination with a regular vector network analyzer and high-frequency power amplifier, this system allows shield-effectivenes... View full abstract»

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  • 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»

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  • Thermo-optic designs for microwave and millimeter-wave electric-field probes

    Publication Year: 1989, Page(s):7 - 11
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Various thermooptic designs are considered for electric-field probes for the approximate frequency range of 1-110 GHz. The designs are all based on using an optically sensed thermometer to measure the temperature rise of a resistive material in an electric field. Calculations of the sensitivities of the different designs, measurement results for the most easily fabricated design, and a discussion ... View full abstract»

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