Power Line
3
RF
2
ESD
1
Imaging Mode
White dots,
dashes, diagonal
lines, or increase in
image background
noise.
Increase in the
image background
noise or white
M-mode lines.
Change of
operating mode,
system settings, or
system reset. Brief
flashes in the
displayed or
recorded image.
M-mode
1. Electrostatic discharge (ESD) caused by discharging of electric charge buildup
on insulated surfaces or persons.
2. Radio frequency (RF) energy from RF transmitting equipment such as portable
phones, handheld radios, wireless devices, commercial radio and TV stations,
and so on.
3. Conducted interference on power lines or connected cables caused by other
equipment, such as switching power supplies, electrical controls, and natural
phenomena such as lightning.
Recommended Separation Distance
The following table provides recommended separation distances, which are
guidelines on the distances that any RF transmitting equipment should be kept
away from the ultrasound system to reduce the risk of interference with the
system. Portable and mobile RF communications equipment should be used no
closer to any part of the system, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency of
the transmitter. Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey, should be less than the compliance level in each
frequency range as noted in the table. Interference may occur in the vicinity of
equipment marked with the following symbol: .
Field strengths from fixed transmitters, such as base stations for radio
(cellular/cordless) telephones and land mobile radios, amateur radio, AM and
FM radio broadcast, and TV broadcast, cannot be predicted theoretically with
iU22 User Manual
80
4535 614 45861
Safety
2
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