4535 611 98931 iE33 Service Manual Page 62
CSIP Level 1 Safety: Electrical Safety
CAUTIONS • Although the system has been manufactured in compliance with existing EMI/EMC require-
ments, 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 emis-
sions. In cases where EMI is causing disturbances, it may be necessary to relocate your sys-
tem.
• Electrostatic discharge (ESD), commonly referred to as a static shock, is a naturally occurring
phenomenon. ESD is most prevalent during conditions of low humidity, which can be caused
by heating or air conditioning. During low-humidity conditions, electrical charges naturally
build up on individuals and can create static shocks. An ESD condition occurs when an indi-
vidual with an electrical energy build-up comes in contact with objects such as metal door-
knobs, file cabinets, computer equipment, and even other individuals. The static shock or
ESD is a discharge of the electrical energy build-up from a charged individual to a lesser or
non-charged individual or object. The level of electrical energy discharged from a system
user or patient to the ultrasound system can be significant enough to cause damage to the
system or transducers. The following precautions can help to reduce ESD: anti-static spray
on carpets; anti-static spray on linoleum; anti-static mats; or a ground wire connection
between the system and the patient table or bed.
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