Emi Limitations - GE Voluson E8 Service Manual

GE H RAFT
EALTHCARE
D KTD102576, R
IRECTION
2-2-3

EMI Limitations

Ultrasound systems are susceptible to Electromagnetic Interference (EMI) from radio frequencies,
magnetic fields, and transients in the air or wiring. Ultrasound systems also generate EMI.
The Voluson E8 / Voluson E6 complies with limits as stated on the EMC label. However, there is no
guarantee that interference will not occur in a particular installation.
NOTICE Possible EMI sources should be identified before the system is installed.
!! NOTICE:
Electrical and electronic equipment may produce EMI unintentionally as the result of a defect.
Sources of EMI include the following:
• medical lasers
• scanners
• cauterizing guns
• computers
• monitors
• fans
• gel warmers
• microwave oven
• light dimmers
• portable phones
• broadcast stations and mobile broadcasting machines
Table 2-3
EMI Rule
Be aware of RF sources.
Ground the system.
Replace and/or reassemble
all screws, RF gaskets,
covers and cores.
Replace broken RF gaskets.
Do not place labels where
RF gaskets touch metal.
Use GE- specified
harnesses and peripherals.
Take care with cellular
phones.
Properly dress peripheral
cables.
2-4
7 DRAFT (A
EVISION
EMI Prevention/Abatement
Keep the system at least 5 meters (16.4 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.
Poor grounding is the most likely reason a system will have noisy images.
Check grounding of the power cord and power outlet.
After you finish repairing or updating the system, replace all covers and tighten all screws.
Any cable with an external connection requires a magnet wrap at each end.
Install the shield over the front of card cage. Loose or missing covers or RF gaskets allow radio
frequencies to interfere with the ultrasound signals.
If more than 20% or a pair of the fingers on an RF gasket are broken, replace the gasket.
Do not turn ON the system until any loose metallic part is removed and replaced, if required.
Never place a label where RF gaskets meet the system. Otherwise, the gap created will permit RF
leakage. In case a label has been found in such a location, move the label to a different,
appropriate location.
The interconnect cables are grounded and require ferrite beads and other shielding.
Cable length, material, and routing are all important; do not make any changes that do not meet
all specifications.
Cellular phones may transmit a 5 V/m signal that causes image artifacts.
Do not allow cables to lie across the top of the card cage 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.
Section 2-2 - General Console Requirements
23, 2012)
UGUST
Details
V E8 / V
OLUSON OLUSON
S M
ERVICE ANUAL
E6