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4535 612 34161 HD3 Service Manual Page 48
CSIP Level 1 Safety: Electrical Safety
Avoiding EMI
and RF
Although the system has been manufactured in compliance with existing EMI/EMC requirements,
use of this system in the presence of an electromagnetic field can cause momentary degradation
of the ultrasound image. If this occurs often, review the environment in which the system is
being used, to identify possible sources of radiated emissions. These emissions could be from
other electrical devices used within the same room or an adjacent room. Communication
devices such as cellular phones and pagers can cause these emissions. The existence of radio, TV,
or microwave transmission equipment located nearby can cause emissions. In cases where EMI is
causing disturbances, it may be necessary to relocate your system.
Electrosurgical units (ESUs) and other devices intentionally introduce radio frequency (RF) elec-
tromagnetic fields or currents into patients. Because imaging ultrasound frequencies are also in
the RF range, ultrasound transducer circuits are susceptible to RF interference. While an ESU is
in use, the noise generated can severely interfere with the black-and-white image and completely
obliterate the color image.
CAUTION Avoid placing the system in an environment that may produce electrostatic discharges (ESD) that
could damage the ultrasound system. (See “About Electrostatic Discharge” on page 51.)