Case history: magnetic interference from a power supply to a computer terminal-magnetic shielding was the solution!

Author

Joffe, Elya B. ; Shefet, Shlomo

Author_Institution

KTM Project Eng. Ltd., Kfar-Sava, Israel

fYear

1992

fDate

2-5 Nov 1992

Abstract

This paper discusses interference to a video display terminal which was rack-mounted in the near vicinity of a high current switch mode AC power supply. Preliminary testing showed that the interference (visualized as `waves´ on the screen) was due to low frequency magnetic interference emanating from the (non-shielded) power supply. The installation of magnetic shielding over the power supply eliminated the problem. Results are presented of measurements of the magnetic fields at the VDT location both prior to and after the application of magnetic shielding and recommendations for future designs are detailed

Keywords

interactive terminals; magnetic field measurement; magnetic shielding; switched mode power supplies; computer terminal; designs; low frequency magnetic interference; magnetic fields; magnetic shielding; switch mode AC power supply; video display terminal; Displays; Frequency; History; Interference; Magnetic field measurement; Magnetic shielding; Power supplies; Switches; Testing; Visualization;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 1992. From a Unified Region to a Unified World., 1992 Regional Symposium on

Conference_Location

Tel-Aviv

Print_ISBN

0-7803-0725-9

Type

conf

DOI

10.1109/ISEMC.1992.257570

Filename

257570