Samsung HS40 - Page 57

2 – 16 HS40 Service Manual
2.3.5.5. Avoiding Electromagnetic Interference
Typical interference on Ultrasound Imaging Systems varies depending on Electromagnetic
phenomena. Please refer to the 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.