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Topic: Electromagnetic interference control

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	Definition: electromagnetic interference control
		electromagnetic interference (EMI) control: The control of radiated and conducted energy such that emissions that are unnecessary for system, subsystem, or equipment operation are reduced, minimized, or eliminated.
		Note: Electromagnetic radiated and conducted emissions are controlled regardless of their origin within the system, subsystem, or equipment.
		Successful EMI control with effective susceptibility control leads to electromagnetic compatibility.
	www.its.bldrdoc.gov /fs-1037/dir-013/_1936.htm (72 words)

	Electronics Material Officer Course
		Electromagnetic interference (EMI) is an electromagnetic or electrostatic disturbance that causes electronic equipment to malfunction or to produce undesirable responses or conditions.
		The key to reducing shipboard EMI is to first identify the source of the offending electromagnetic energy, then to determine a method of correction and, finally, to correct or minimize the effect.
		Interference that occurs as the result of mixing two signals (heterodyning) in a nonlinear element such as the first stage of a receiver or the final stage of a transmitter.
	www.fas.org /man/dod-101/navy/docs/swos/e1/MOD3LES2.html (3602 words)

	INTERFERENCE
		Interference can be experienced as a hum, buzz, crackle, or feedback whine through a hearing aid, competing with and often entirely masking the sound source one is trying to hear.
		The interference produced by the demodulation of a high frequency EM signal is generated by both the electrical and magnetic components of this signal.
		The level of interference is dependent on both the strength of the EM field and the relative immunity of the hearing aid to EM interference.
	www.access-board.gov /research/interference.htm (1636 words)

	Spectrum Control, Inc. : Signal & Power Integrity Products
		TS 16949 is a rigid quality management program which includes all of the internationally accepted standards of ISO 9001.
		Spectrum Control has a fully equipped EMC test laboratory and experienced engineering staff ready to solve demanding EMC challenges.
		Spectrum Control now offers its high performance series 700 D-subminiature filtered connectors in significantly shorter lead times.
	www.specemc.com (146 words)

	UNDERSTANDING and controlling RF interference
		Interference is not hard to find; it is actually difficult to avoid, especially in urban areas where the wireless revolution is well underway.
		Electromagnetic compatibility (EMC), is a term coming into more widespread use regarding issues of equipment electromagnetic emissions and susceptibility, especially because regulations now require all equipment sold in Europe to carry the CE mark.
		Electromagnetic fields, such as radio and TV signals, travel through space (or air) at the speed of light, about 300,000,000 m/sec or 186,000 miles/sec.
	svconline.com /mag/avinstall_understanding_controlling_rf (1495 words)

	ARRLWeb: Interference: Its Potential Effect on Pacemaker Systems
		Most pacemaker circuitry uses filters to attenuate electromagnetic interference (EMI) outside the normal intracardiac range and, whereas this design is effective when the interference characteristics are quite different from detected signals associated with cardiac activity, some EMI can produce signals that are similar enough to normal intracardiac activity to cause problems.
		In extreme cases, where the interference is of a sufficiently high magnitude, it is possible for the pacemaker circuitry to be damaged, leading to a continued abnormal pacing behavior.
		Electromagnetic interference of sufficient magnitude to be detected by Maestro II series pulse generators, results in noise response mode behavior.
	www.arrl.org /tis/info/pcmkr.html (3133 words)

	eEngineer -- Introduction
		Electromagnetic Interference (EMI) is caused by undesireable radiated electromagnetic fields or conducted voltages and currents.
		The interference is produced by a source emitter and is detected by a susceptible victim via a coupling path.
		Electromagnetic waves exist in nature as a result of the radiation from atoms or molecules when they change from one energy state to another and by natural fluctuations such as lightning.
	www.radioing.com /eengineer/intro.html (895 words)

	Glossary for Electromagnetic Interference (EMI) Shielding
		Electromagnetic Compatibility (EMC) — Capability of electronic equipment or systems to operate with a defined margin of in the intended operational environment at designed levels or efficiency without degradation due to interference.
		Electromagnetic field in which the magnetic component is more intense than the electrical component.
		Interference — Any undesirable electromagnetic emission or nay electrical or electromagnetic disturbance, phenomenon, signal or emission, man-made or natural, which causes or can cause undesired response, malfunctioning, or degradation of the electrical performance of electrical or electronic equipment.
	www.vactecinc.com /glossary.htm (1771 words)

	The Basics of EMC: Electromagnetic Compatibility
		Electromagnetic compatibility is the situation in which electrical and electronic devices and systems work as intended, both within themselves and in their electromagnetic environment.
		Electromagnetic interference (EMI) is said to exist when unwanted voltages or currents are present so that they adversely affect the performance of a device or system.
		In all cases, electromagnetic interference arises because of a combination of three factors: a source, a transmission path, and a response, at least one of which is unplanned.
	www.measurement-testing.com /EMC-electromagnetic-compatibility.html (499 words)

	Electromagnetic Interference
		This document is intended to describe the principal causes of electromagnetic interference and present a methodology for reducing the potential risks associated with EMI in the health care environment.
		The amount of electromagnetic energy emitted by a device (or to which a device may be (susceptible to) is commonly expressed in terms of its electric field strength, and is typically given in the units of volts per meter (V/m).
		When electromagnetic interference is suspected, the first step in resolving the problem is to determine the mechanism for energy transfer to the affected device(s): radiation, conduction, or induction.
	ibet.asttbc.org /emi.htm (5667 words)

	Pro AV Magazine
		Control the noise in your systems and ensure the long-term performance of your equipment.
		In the case of equipment that uses electrical signals, as opposed to technologies such as fiber optics, this noise is called electromagnetic interference (EMI).
		Other EMI techniques, such as circuit impedance and configuration and internal RF filtering are the domain of electronic equipment designers and are only under their control to the extent that they choose or don’t choose to use certain equipment.
	proav.pubdyn.com /2005_June/June20527200535018PM.htm (2806 words)

	R A Mayes \| EMC Compliance Test Standards
		—Electromagnetic compatibility and radio spectrum matters (ERM); Short-range devices; Technical characteristics and test methods for radio equipment to be used in the 25 to 1000 MHz frequency range with power levels ranging up to 500 mW; Part 1: Parameters intended for regulatory purposes.
		—Electromagnetic compatibility—Electrical apparatus for the detection and measurement of combustible gases, toxic gases, or oxygen.
		—Electromagnetic compatibility (EMC)—Part 3-3: Limits—This section is applicable to electrical and electronic equipment having an input current up to and including 16 A per phase and intended to be connected to public low-voltage distribution systems of between 220 V and 250 V at 50 Hz line to neutral.
	www.ramayes.com /EMC_Standards.htm (4287 words)

	[No title]
		This standard establishes interface and associated verification requirements for the control of the electromagnetic interference (emission and susceptibility) characteristics of electronic, electrical, and electromechanical equipment and subsystems designed or procured for use by activities and agencies of the Department of Defense.
		An area on ships which is surrounded by a metallic structure, or an area which provides significant attenuation to electromagnetic radiation, such as the metal hull or superstructure of a surface ship, the pressure hull of a submarine and the screened rooms in non-metallic ships.
		During testing, the ambient electromagnetic level measured with the EUT de-energized and all auxiliary equipment turned on shall be at least 6 dB below the allowable specified limits when the tests are performed in a shielded enclosure.
	snebulos.mit.edu /projects/reference/MIL-STD/MIL-STD-461E.doc (17322 words)

	Sources of Electromagnetic Interference (EMI)
		The device may sense electromagnetic interference from small hammers, thus generating inappropriate therapy.
		Interference has been noted when in close proximity to the detection poles.
		TENS is prescribed by doctors or chiropractors for control of chronic pain.
	www.guidant.com /patient/living (2132 words)

	Report on Electromagnetic Interference in Hospitals
		In England, then NHS (National Health Service) issued report DB9702, "Electromagnetic Compatibility of Medical Devices with Mobile Communications." In that 1997 report, only 4% of handheld transmitters (all types) cause any interference at a distance of one meter (3 feet).
		At a distance of 1m; 41% of medical devices suffered interference from emergency services handsets, 35% suffered interference from security/porters handsets but only 4% from cellphones.
		No significant levels of interference were detected from cordless handsets/local area networks or cellular base stations." The report has not been updated.
	www.pdacortex.com /EMI.htm (874 words)

	FDA Consumer Reprint--Keeping Medical Devices Safe From Electromagnetic Interference
		The problem is electromagnetic interference (EMI), and it's becoming a growing concern among hospital staffs, electronics manufacturers, and the Food and Drug Administration.
		Because the interference was almost always fleeting and difficult to reproduce, most of those reports have not been verified or duplicated in laboratory settings.
		The electromagnetic waves radiating from someone's phone caused a powered wheelchair to spin out of control and a woman's implant cardiac defibrillator to fire without cause.
	www.fda.gov /fdac/reprints/emi.html (1555 words)

	Pest Control — Easy Fixes to this Problem
		Lentek's Digital PestContro II is a new electronic pest control product in their line of award-winning electronic pest control products.
		This pest control technology combines two proven pest control systems: "Electromagnetic" interference for pest problems within walls and "Ultrasonic" sound to control the pests within the living area.
		The PestContro Ultrasonic uses Lentek's exclusive "Electromagnetic Technology", which utilizes the existing electrical field around wiring in your home's walls and ceilings to deliver irritating "pulsations" to mice and rats.
	www.gooddeals.com /pest-control.asp (862 words)

	Definition: control of electromagnetic radiation (Site not responding. Last check: )
		Measures taken to minimize unintended electromagnetic radiation emanating from a system or component and to minimize electromagnetic interference.
		Note: Control of electromagnetic radiation is exercised for purposes of security and the reduction of interference, especially on ships and aircraft.
		A national operational plan to minimize the use of electromagnetic radiation in the United States and its possessions and the Panama Canal Zone in the event of attack or imminent threat thereof, as an aid to the navigation of hostile aircraft, guided missiles, or other devices.
	www.atis.org /tg2k/_control_of_electromagnetic_radiation.html (122 words)

	NASA SEE TWG-Electromagnetic Effects & Spacecraft Charging-Related Publications
		During this electrical interconnection process, various environments may be encountered that warrant the restriction of the voltage and current present across the pins of an electrical connector prior to separation, mating, or in a static open non-mated configuration.
		This report describes the tests done to quantify the degradation of the thermal control properties caused by electron exposure and to measure the luminescence as a function of electron energy and current density to the satellite.
		Included is the definition of electromagnetic interference (EMI) terms and units as well as an explanation of the basic EMI interactions.
	see.msfc.nasa.gov /ee/eepub.htm (2914 words)

	MEM:Electromagnetic Interference (Fall '99)
		In patient-connected medical electronics, immunity to external radio-frequency interference (RFI) is one of the toughest electromagnetic interference (EMI) problems to handle.
		As long as the patient is exposed to the interference, the cable ends are also exposed.
		Beginning with the cable end, it is best to implement a CM choke, which inserts high impedance in line to minimize the interference current on the signal wires.
	www.devicelink.com /mem/archive/99/09/010.html (2400 words)

	EMC Directive Electromagnetic Compatibility & Interference, CE Mark UL & IEC EN Standards
		EN 60730-2-18:1999-Automatic electrical controls for household and similar use-Part 2-18: Particular requirements for automatic electrical water and air-flow sensing controls, including mechanical requirements.
		EN 60947-5-3:1999-Low-voltage switch gear and control gear-Part 5-3: Control circuit devices and switching elements-Requirements for proximity devices with defined behavior under fault conditions (PDF).
		IEEE C63.5:1998-Electromagnetic compatibility-Radiated emission measurements in electromagnetic interference (EMI) control-Calibration of antennas.
	www.certifygroup.com /pages/emc.htm (7522 words)

	Electromagnetic interference - Wikipedia, the free encyclopedia
		Electromagnetic interference (also called EMI, Radio Frequency Interference, and RFI) is electromagnetic radiation which is emitted by electrical circuits carrying rapidly changing signals, as a by-product of their normal operation, and which causes unwanted signals (interference or noise) to be induced in other circuits.
		It can be induced intentionally, as in some forms of electronic warfare, or unintentionally, as a result of spurious emissions and responses, intermodulation products, and the like.
		Electromagnetic intereference can also be emitted by things not normally considered to be electrical circuits, such as the Sun or the Northern Lights.
	en.wikipedia.org /wiki/Electromagnetic_interference (529 words)

	Definition: electromagnetic interference control (Site not responding. Last check: )
		electromagnetic interference (EMI) control: The control of radiated and conducted energy such that emissions that are unnecessary for system, subsystem, or equipment operation are reduced, minimized, or eliminated.
		Note: Electromagnetic radiated and conducted emissions are controlled regardless of their origin within the system, subsystem, or equipment.
		Successful EMI control with effective susceptibility control leads to electromagnetic compatibility.
	www.atis.org /tg2k/_electromagnetic_interference_control.html (94 words)

	Electromagnetic Interference in T-Coil Hearing Aids (Site not responding. Last check: )
		Our firm was retained to investigate complaints of high levels of electrical interference experienced by University of British Columbia staff wearing hearing aids in the newly constructed Brock Hall.
		The architect requested that we try to identify the source of the noise and see if it may be related to a deficiency in the construction of the new facility.
		Warick regularly uses a hearing aid equipped with a T-coil in her office where, ironically, the noise was reported to be the worst.
	www.mcsquared.com /caa94.htm (2100 words)

	Which Journal Would Be Right for My Research?
		Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
		The enhancement of electromagnetic compatibility (electromagnetic compatibility is defined as the capability of systems or equipment to be tested in the intended environment at designed levels of efficiency without degradation due to electromagnetic interactions), including, but not necessarily limited to:
		Included are power electronics and drive control techniques, system control and signal processing, fault detection and diagnosis, power systems, instrumentation, measurement and testing, modeling and simulation, motion control, robotics, sensors and actuators, implementation of neural nets, fuzzy logic, and artificial intelligence in industrial systems, factory automation,communication, and computer networks.
	www.ieee.org /organizations/pubs/transactions/tec3.htm (6310 words)

	Davidson Instruments
		Davidson was founded in 1995 for the purpose of developing fiber optic sensing systems that would overcome the three fundamental limitations of conventional electronic sensing systems, i.e.
		Since optical fibers are insensitive to electromagnetic interference, the signal is free of EMI noise.
		The fundamental limitations of the electronic systems lead to a number of practical problems that industry has had to work around such as thermal sensitivity, freezing, condensation, purge gases, explosion-proof containment, grounding, lightning, hydrogen migration, and electromagnetic interference.
	www.davidson-instruments.com (464 words)

	Paradigm Press
		This second edition of the popular text on the subject of electrical interference in buildings provides an introduction to causes and cures of electromagnetic interference problems often experienced but seldom discussed in public, those found in buildings of various types.
		The text arose out of experience in solving electromagnetic interference (EMI) problems in various types of buildings and covers sources of EMI in buildings, EMI cures, and electromagnetic compatibility (EMC) in planning and specifications.
		General requirements for avoidance and solution of interference problems in office buildings are discussed, along with special requirements for computer centres, communications installations, hospitals and laboratories.
	www.paradigm-press.com /buildings2.htm (307 words)

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