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GE M
S
EDICAL
YSTEMS
D
2300164-100, R
IRECTION
The following table lists recommendations for preventing EMI:
Table 2-4
EMI Rule
Ground the unit.
Be aware of RF sources.
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 address peripheral
cables.
2-2-7
Probe Environmental Requirements
Table 2-5
Operation
Storage
Note:
System and electronic probes are designed for storage temperatures of -20
exposed to large temperature variations, the probes should be kept at room temperature for
a minimum of 10 hours before use.
2-6
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7
EVISION
EMI Prevention/ Abatement
Poor grounding is the most likely reason an ultrasound unit will have noisy images.
Check the grounding of the power cord and power outlet.
Keep the unit at least 5m (16.4 ft) 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.
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 the 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 unit until any loose metallic part is removed and replaced, if required.
Never place a label where RF gaskets meet the unit. 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 any peripheral cable excess length inside the peripheral bays or hang on the
hooks provided below the console. Attach the monitor cables to the frame.
Probe Operation and Storage Temperatures
Electronics
o
10 — 40
C (50 — 104
o
-20 — 50
C (-4 — 122
Section 2-2 - Console Requirements
V
IVID
Details
PAMPTE
o
o
F)
5 — 42.7
C
(41 — 109
o
o
F)
-20 — 50
C
(-4 — 122
™ 3 P
/V
™ 3 S
RO
IVID
ERVICE
o
F)
o
F)
o
o
to +50
C. When
M
ANUAL
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