Philips 107B4374 User manual - Page 39

Flicker, Hertz, Horizontal dot pitch, Horizontal scanning frequency, In 1991

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Glossary 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 See Dot pitch. Horizontal scanning frequency file:///D|/Rita/LF3/lf3manual/english/GLOSSARY/GLOSSARY.HTM (6 of 18) [2002/7/7 ?? 11:01:57]

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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
See Dot pitch.
Horizontal scanning frequency
Glossary
file:///D|/Rita/LF3/lf3manual/english/GLOSSARY/GLOSSARY.HTM (6 of 18) [2002/7/7 ?? 11:01:57]