Table 5.1 Sources Of Magnetic Fields And Fault Symptoms; Chapter 5 Electromagnetic Environment And Static Electricity - Fujitsu M10 Series Installation Planning Manual

CHAPTER 5 Electromagnetic Environment and Static Electricity

5.1.2 Sources of magnetic fields and fault symptoms
Table 5.1
screen faults.

Table 5.1 Sources of magnetic fields and fault symptoms (1/2)

Magnetic field
component
AC magnetic field
components
60
lists the possible sources of magnetic fields and the associated display
Source of magnetic field
1 Power supply facilities, such as an uninterruptible
power supply and a transformer, or any electrically
driven equipment, such as a motor: Magnetic fields are
generated by current flowing through the equipment.
Example: AC magnetic field of 8.2 at a point 4 m
(13 ft) away from a transformer rated at 100 kVA.
2 Indoor electrical connections: A separation of 2 m (7 ft)
from connections rated at 30 A or so will eliminate their
effects.
Example: AC magnetic field of 2.5 at a point 1 m (3
ft) away from a connection that is not enclosed in a steel
pipe.
3 High-voltage transmission lines, electric car overhead
lines
Example: A high-voltage transmission line rated at
about 280 A will affect the display images of displays
installed 5 m (16 ft) away with a magnetic field of 2.4
, but will not affect those of a display device installed
10 m (33 ft) away with only 0.6 
4 Adjacent equipment: Magnetic fields generated from
the adjacent equipment could exert adverse effects.
Example: AC magnetic field of 3  at a point 200 mm
(8 in.) away from a display device.
5 Mutual interference among display devices: Magnetic
fields generated from the deflection yoke in each device
may have an interfering effect.
Example: AC magnetic field of 3 at a point 200 mm
(8 in.) away from a display device.
Fault symptom
Fluctuating display
images
C120-H007-08EN