GE LOGIQ Totus, Базовое руководство по обслуживанию, Страница: 73 / 644

GE HealthCare CONFIDENTIAL
Direction 5936427 , Rev. 1 LOGIQ Totus Basic Service Manual
Chapter 2 Site Preparations 2 - 7
2-2-3 EMI limitations (continued)
Table 2-5
for EMI prevention and abatement tips.
Table 2-5 EMI Prevention/Abatement
EMI Rule Detail
Be aware of RF sources
• Keep the LOGIQ Totus at least 5 meters or 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 LOGIQ Totus Poor grounding is the most likely reason a LOGIQ Totus will have noisy images. Check grounding
of the power cord and power outlet.
Replace all screws, RF
gaskets, covers, cores
• After you finish repairing or updating the LOGIQ Totus, replace all covers and tighten all screws.
• Any cable with an external connection requires a magnet wrap at each end.
• Install the card rack cover over the card rack. Loose or missing covers or RF gaskets allow radio
frequencies to interfere with the ultrasound signals.
Replace broken RF
gaskets
If more than 20% or a pair of the fingers on an RF gasket are broken, replace the gasket. Do not
turn on the LOGIQ Totus until any loose metallic part is removed.
Do not place labels where
RF gaskets touch metal
Never place a label where RF gaskets meet the LOGIQ Totus. Otherwise, the gap created will
permit RF leakage. Or, if a label has been found in such a position, move the label.
Use GE HealthCare
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 dress peripheral
cables
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.