Philips 105S61 User manual - Page 26

Flicker, Hertz, Horizontal dot pitch, nstemannens Central Organization TCO, Swedish confederation

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In 1991, the Swedish Tjänstemannens Central Organization (TCO, Swedish confederation of Professional Employees ) set a standard even more severe than MPR-II, especially for alternating electric fields (AEF). The TCO standard is more severe since not only are the permitted field levels reduced compared with MPR-II, but the measuring distance is also reduced (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. RETURN TO TOP OF THE PAGE 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. RETURN TO TOP OF THE PAGE 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

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In 1991, the Swedish Tj
รค
nstemannens Central Organization (TCO, Swedish confederation of
Professional Employees ) set a standard even more severe than MPR-II, especially for
alternating electric fields (AEF). The TCO standard is more severe since not only are the
permitted field levels reduced compared with MPR-II, but the measuring distance is also reduced
(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.
RETURN TO TOP OF THE PAGE
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.
RETURN TO TOP OF THE PAGE
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