Unit Power Plug; Power Stability Requirements; Emi Limitations - GE LOGIQ A3 Basic Service Manual

GE H
EALTHCARE
D 5213326-100, R
IRECTION
2-2-3 Power Requirements
2-2-3-4

Unit Power Plug

If the unit arrives without the power plug, or with the wrong plug, you must contact your GE dealer or
the installation engineer must supply what is locally required.
2-2-3-5

Power Stability Requirements

Voltage drop-out / Max 10 ms.
Power Transients
Refer Table 2-4
2-2-4

EMI Limitations

Ultrasound machines are susceptible to Electromagnetic Interference (EMI) from radio frequencies,
magnetic fields, and transients in the air or wiring. Ultrasound machines also generate EMI. The LOGIQ
A3 complies with limits as stated on the EMC label. However, there is no guarantee that interference
will not occur in a particular installation.
Possible EMI sources should be identified before the unit is installed.
Electrical and electronic equipment may produce EMI unintentionally as the result of a defect. These
sources include:
• medical lasers,
• scanners,
• cauterizing guns,
• computers,
• monitors,
• fans,
• gel warmers,
• microwave ovens,
• light dimmers
• portable phones.
• Lift
The presence of a broadcast station or broadcast van may also cause interference.
See Table 2-5
EMI Rule
Be aware of RF sources
Ground the unit
Replace all screws, RF
gaskets, covers, cores
Replace broken RF gaskets
2-4
Approv e d Docu m ent - 5213326-100TPH_r3.pdf Page 53 of 252
3
EVISION
(cont'd)
for EMI Prevention tips.
Keep the unit 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.
Poor grounding is the most likely reason a unit 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 unit until any loose metallic part is removed.
Table 2-5 EMI Prevention/Abatement
Section 2-2 - General Console Requirements
LOGIQ™ A3 S
Details
M
ERVICE ANUAL