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(see table).
Electromagnetic radiation standards
EMI (Electrical Magnetic Interference)
The electrical and/or magnetic radiation coming from the working electrical or electronic
equipment.
EMS (Electrical Magnetic Sustainment)
The ability of electrical or electronic equipment to function properly in the environment with
electrical and/or magnetic interference.
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F
Flicker
Very rapid variations in picture intensity caused by the finite time required for the electron beam
to scan a picture onto the screen. Two kinds of flicker occur: line flicker caused by the electron
beam scanning-in each line of the picture; and frame flicker (or field flicker if the picture is
interlaced) caused by the frame repetition rate of 50 frames/second. Frame flicker is noticeable
with GUI and DTP software (which have a light background), and can be very disturbing,
especially for those who work regularly with displays - contributing to eye strain, headaches,
visual blurring, stress, etc. The problem can, however, be eliminated by increasing the refresh
rate (number of frames/second) of the monitor to a value above around 70 Hz. Sensitivity to
flicker appears to diminish with increasing age.
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H
Hertz
The unit of frequency named after the physicist Heinrich Hertz (1857-1894). 1 hertz (Hz) is equal
to 1 cycle/second.
Horizontal dot pitch
See Dot pitch.
Horizontal scanning frequency
Also called line frequency and expressed in kHz, it is the number of video lines written on the
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