Magnetic field effects on CRT computer monitors

Summary form only as given. 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 effec...

Full description

Saved in:
Bibliographic Details
Published inIEEE Power Engineering Society. 1999 Winter Meeting (Cat. No.99CH36233) Vol. 2; p. 1222 vol.2
Main Authors Banfai, B., Karady, G.G., Kim, C.J., Maracas, K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1999
Subjects
Cathode ray tubes
Computer displays
Frequency
Interference
Jitter
Magnetic field measurement
Magnetic fields
Manufacturing
Test facilities
Testing
Online AccessGet full text

Cover

More Information
Summary:Summary form only as given. 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" monitor. This value drops to around 7 mG for a 21" monitor.
ISBN:0780348931
9780780348936
DOI:10.1109/PESW.1999.747385