GE Vivid E80, Service Manual

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2-8
Vivid E80/E90/E95
–
Service Manual
GC091052 Rev. 3
EMI prevention/abatement
Table 2-4: EMI prevention/abatement
EMI RULE DETAILS
Be aware of Radio
Frequency sources • Keep the Ultrasound system at least 5 meters (15 feet)
away from other EMI sources.
• Special shielding may be required to eliminate
interference problems caused by high frequency, high
powered radio or video broadcast signals.
Ground the
Ultrasound system Poor grounding is the most likely reason an Ultrasound
system will have noisy images. Check grounding of the
power cord and power outlet.
Replace all screws,
Radio Frequency
gaskets, covers,
cores • After you finish repairing or updating the Ultrasound
system, replace all covers and tighten all screws.
• Any cable with an external connection requires a magnet
wrap at each end.
• Install all covers. Loose or missing covers or Radio
Frequency gaskets allow radio frequencies to interfere
with the ultrasound signals.
Replace broken
Radio Frequency
gaskets If more than 20% or a pair of the fingers on an Radio
Frequency gasket are broken, replace the gasket. Do not turn
on the Ultrasound system until any loose metallic part is
removed.
Do not place labels
where Radio
Frequency gaskets
touch metal Where applicable, never place a label where Radio
Frequency gaskets meet the Ultrasound system. Otherwise,
the gap created will permit Radio Frequency leakage. Or, if a
label has been found in such a position, move the label.
Use GE specified
harnesses and
peripherals The interconnect cables are grounded and require ferrite
beads and other shielding. Also, cable length, material, and
routing are all important; do not change from what is
specified.
Take care with
cellular phones Cellular phones may transmit a 5 V/m signal; that could
cause image artifacts.
Properly route
peripheral cables Where applicable, do not allow cables to lie across the top of
the Card Rack or hang out of the peripheral bays. Loop the
excess length for peripheral cables inside the peripheral
bays. Attach the monitor cables to the frame.