Power frequency magnetic fields and computer monitor instability
1998 (English)In: Displays (Guildford), ISSN 0141-9382, E-ISSN 1872-7387, Vol. 19, no 2, 85-90 p.Article in journal (Refereed) Published
Owing to the increased use of electronic loads, the harmonic content of the magnetic field in buildings has increased and it is therefore of interest to study how the harmonics (i.e. 150 Hz magnetic fields) will affect the stability of the picture on the monitor screen. Another frequency of interest to study is 16.7 Hz, the frequency used by the Swedish railway. Ten volunteers were asked to judge the occurrence of jitter on a 15-in. color monitor screen, refresh rate 72.2 Hz, at different amplitudes and frequencies of the vertical applied magnetic field. The tested screen had a highest sensitivity to 150 Hz external magnetic field, followed by 60, 16.7 and 50 Hz. In a static magnetic field the screen had a sensitivity (displacement) of 0.031±0.006 mm per applied microtesla.
Place, publisher, year, edition, pages
Elsevier, 1998. Vol. 19, no 2, 85-90 p.
Jitter, Video display terminal, Harmonics, B-field
Environmental Health and Occupational Health
IdentifiersURN: urn:nbn:se:umu:diva-99025DOI: 10.1016/S0141-9382(98)00042-0OAI: oai:DiVA.org:umu-99025DiVA: diva2:785317