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Measurement and Analysis of Electromagnetic Field Emissions from 24 Video Display Terminals in American Telephone and Telegraph Office, Washington, D.C.
University of Washington, Center for Bioengineering, Bioelectromagnetics Research Laboratory, Seattle, Washington, 1987 Mar; :1-40
Electromagnetic field emissions were determined from 24 video display terminals (VDTs) located in a service office of an American Telephone and Telegraph (ATT) office in Washington, D.C. Health concerns had been expressed to their labor unions by employees using the 24 VDTs. Measurements were conducted on three different types of VDT models including 21 ATT Model 45 units, two TAB Model 132/15 units, and one ATT Model 6300 PC unit. The electric and magnetic field exposure levels at the position of the operator (30 centimeters) based on these measurements were well below all of the exposure standards. The operator's hand could be exposed to electric fields higher than the safety standards while contacting the screen or sides of the terminal. However, the currents induced in the body were significantly less than those induced by environmental far field exposures at levels below all the world's safety standards. The magnitudes of the highest static fields were no different from levels produced by static charges in the environment such as on fabrics and other articles in offices and homes. These fields were particularly low on screens of terminals equipped with anti glare filters.
Computer-equipment; Office-workers; Keyboard-operators; Radiation-exposure; Nonionizing-radiation; Magnetic-fields; Electrical-fields; Electromagnetic-radiation; Video-display-terminals; Occupational-exposure;
NTIS Accession No.
University of Washington, Center for Bioengineering, Bioelectromagnetics Research Laboratory, Seattle, Washington, 40 pages, 9 references
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division