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Chapter 1 Safety
Electromagnetic environment – guidance
The Ultrasound System must be used only in a shielded location with a minimum RF shielding
effectiveness and, for each cable that enters the shielded location. Field strengths outside the shielded
location from fixed RF transmitters, as determined by an electromagnetic site survey, should be less
than 3V/m.
It is essential that the actual shielding effectiveness and filter attenuation of the shielded location be
verified to assure that they meet the minimum specification.
CAUTION: If the system is connected to other customer-supplied equipment, such as a local area
network (LAN) or a remote printer, Samsung Medison cannot guarantee that the remote equipment
will work correctly in the presence of electromagnetic phenomena.
Avoiding Electromagnetic Interference
Typical interference on Ultrasound Imaging Systems varies depending on Electromagnetic
phenomena. Please refer to following table:
Imaging Mode ESD
(1)
RF
(2)
Power Line
(3)
2D Change of operating
mode, system settings,
or system reset.
Brief flashes in the
displayed or recorded
image.
For sector imaging probes,
white radial bands or flashes in
the centerlines of the image.
For linear imaging probes, white
vertical bands, sometimes more
pronounced on the sides of the
image.
White dots, dashes, diagonal
lines, or diagonal lines near the
center of the image.
M
Increase in the image
background noise or white M
mode lines.
White dots, dashes, diagonal
lines, or increase in image
background noise
Color
Color flashes, radial or vertical
bands, increase in background
noise, or changes in color
image.
Color flashes, dots, dashes, or
changes in the color noise level.
Doppler
Horizontal lines in the spectral
display or tones, abnormal noise
in the audio, or both.
Vertical lines in the spectral
display, popping type noise in
the audio, or both.
(1)
ESD caused by discharging of electric charge build-up on insulated surfaces or persons.
(2)
RF energy from RF transmitting equipment such as portable phones, hand-held radios, wireless devices,
commercial radio and TV, and so on.
(3)
Conducted interference on powerlines or connected cables caused by other equipment, such as switching
power supplies, electrical controls, and natural phenomena such as lightning.
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