Magnetic field effects on CRT computer monitors

Balazs Banfai; George G. Karady; Charles J. Kim; Kate Brown Maracas

doi:10.1109/61.847267

Magnetic field effects on CRT computer monitors

Balazs Banfai, George G. Karady, Charles J. Kim, Kate Brown Maracas

Electrical, Computer, and Energy Engineering, School of (IAFSE-ECEE)

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

This paper discusses the effect of external low frequency magnetic field interference on cathode ray tube (CRT) computer monitors. The paper describes a new test facility and presents a quantitative measuring method which has been developed to characterize the field effects. A total of 21 monitors from major manufacturers were tested. It was found that larger monitors are more sensitive and that the relationship between the magnitude of jitter and the magnetic flux density is linear and independent of the refresh rate and the frequency of the interfering magnetic field. The monitors are most sensitive to magnetic fields parallel to the screen. Monitor sensitivity is specified and presented for the tested monitors. A statistical survey was carried out to determine the human perceptibility level of jitter. It was found that 12 mG may cause detectable jitter for the common 14 inches monitor. This value drops to around 7 mG for a 21 inches monitor.

Original language	English (US)
Pages (from-to)	307-312
Number of pages	6
Journal	IEEE Transactions on Power Delivery
Volume	15
Issue number	1
DOIs	https://doi.org/10.1109/61.847267
State	Published - Jan 2000

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1109/61.847267

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title = "Magnetic field effects on CRT computer monitors",

abstract = "This paper discusses the effect of external low frequency magnetic field interference on cathode ray tube (CRT) computer monitors. The paper describes a new test facility and presents a quantitative measuring method which has been developed to characterize the field effects. A total of 21 monitors from major manufacturers were tested. It was found that larger monitors are more sensitive and that the relationship between the magnitude of jitter and the magnetic flux density is linear and independent of the refresh rate and the frequency of the interfering magnetic field. The monitors are most sensitive to magnetic fields parallel to the screen. Monitor sensitivity is specified and presented for the tested monitors. A statistical survey was carried out to determine the human perceptibility level of jitter. It was found that 12 mG may cause detectable jitter for the common 14 inches monitor. This value drops to around 7 mG for a 21 inches monitor.",

author = "Balazs Banfai and Karady, {George G.} and Kim, {Charles J.} and Maracas, {Kate Brown}",

note = "Funding Information: Manuscript received May 26, 1998; revised September 10, 1998. This study was sponsored by Salt River Project, Southern California Edison Company, and the American Public Power Association. B. Banfai and G. G. Karady are with the Department of Electrical Engineering, Arizona State University. C. J. Kim is with Southern California Edison. K. Maracas is with Salt River Project. Publisher Item Identifier S 0885-8977(00)00546-X.",

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AU - Maracas, Kate Brown

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N2 - This paper discusses the effect of external low frequency magnetic field interference on cathode ray tube (CRT) computer monitors. The paper describes a new test facility and presents a quantitative measuring method which has been developed to characterize the field effects. A total of 21 monitors from major manufacturers were tested. It was found that larger monitors are more sensitive and that the relationship between the magnitude of jitter and the magnetic flux density is linear and independent of the refresh rate and the frequency of the interfering magnetic field. The monitors are most sensitive to magnetic fields parallel to the screen. Monitor sensitivity is specified and presented for the tested monitors. A statistical survey was carried out to determine the human perceptibility level of jitter. It was found that 12 mG may cause detectable jitter for the common 14 inches monitor. This value drops to around 7 mG for a 21 inches monitor.

AB - This paper discusses the effect of external low frequency magnetic field interference on cathode ray tube (CRT) computer monitors. The paper describes a new test facility and presents a quantitative measuring method which has been developed to characterize the field effects. A total of 21 monitors from major manufacturers were tested. It was found that larger monitors are more sensitive and that the relationship between the magnitude of jitter and the magnetic flux density is linear and independent of the refresh rate and the frequency of the interfering magnetic field. The monitors are most sensitive to magnetic fields parallel to the screen. Monitor sensitivity is specified and presented for the tested monitors. A statistical survey was carried out to determine the human perceptibility level of jitter. It was found that 12 mG may cause detectable jitter for the common 14 inches monitor. This value drops to around 7 mG for a 21 inches monitor.

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Magnetic field effects on CRT computer monitors

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