This can be stopped by enclosing the monitor in an enclosure made from magnetic shielding alloy. Magnetic Shield Corporation stocks standard products, but also has full manufacturing facilities for fabrication of your custom magnetic shield designs complete to print, including Perfection Annealling for optimum magnetic properties. Mail or fax your print and quantity requirements, or send AutoCad files in .dwg or .dfx formats up to and including R14 versions by e-mail for a prompt quotation. A magnetic field cannot be seen, heard, or felt. The magnetic field results from a source of magnetic flux, which might be the Earth, a motor, transformer or electric power line, or even a bar magnet.
Magnetic fields make transformers and motors function, and have many other uses.
DC fields are non-varying, or perhaps slowly changing. A DC field might be from the Earth, a permanent magnet, or a coil carrying direct current. AC magnetic fields oscillate in direction at a frequency. The most common AC magnetic fields are 60 Hertz fields emitted by electric power equipment. ELF stands for Extremely Low Frequency and usually refers to magnetic fields at 0.5 to 100 Hertz.