Magnetic field effects on CRT computer monitors

B. Banfai, G. G. Karady, C. J. Kim, K. Maracas

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 languageEnglish (US)
Title of host publicationIEEE Engineering Society, Winter Meeting
Editors Anon
Place of PublicationPiscataway, NJ, United States
Number of pages1
StatePublished - 1999
EventProceedings of the 1999 Winter Meeting of IEEE Power Engineering Society. Part 1 (of 2) - New York, NY, USA
Duration: Jan 31 1999Feb 4 1999


OtherProceedings of the 1999 Winter Meeting of IEEE Power Engineering Society. Part 1 (of 2)
CityNew York, NY, USA

ASJC Scopus subject areas

  • General Engineering


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