Noise - GE LOGIQ E9 Service Manual

D 5180483-100, R
IRECTION
7-9-2

Noise

Ultrasound machines are susceptible to Electromagnetic Interference (EMI) from radio frequencies,
magnetic fields, and transients in the air or wiring. They also generate EMI. Possible EMI sources
should be identified before the unit is installed. See:
Floor test.
Electrical and electronic equipment may produce EMI unintentionally as the result of a defect. Some of
these sources include:
• medical lasers
• scanners
• cauterizing guns
• computers
• monitors
• fans
• gel warmers
• microwave ovens
• light dimmers
• portable phones
The presence of a broadcast station or broadcast van may also cause interference.
When talking to the customer, try to gather as much information as possible about the conditions when
the noise appear:
Is the noise present...
... all the time?
(See:
Cables" on page 7-196
... after some time of use? (After how long time?)
(See: 7-9-2-6 "Self-Generated Noise (Noise Generated Inside the LOGIQ E9)" on page 7-197.)
... at special times of the day (or night)? When?
(See: 7-9-2-1 "Noise Picked up from the Air" on page 7-196 and 7-9-2-2 "Noise Received via the
External Cables" on page 7-196.)
... at all locations in the hospital, or only in one room/area?
-
-
... from time to time, no special pattern of time is observed?
(See: 7-9-2-1 "Noise Picked up from the Air" on page 7-196 and 7-9-2-2 "Noise Received via the
External Cables" on page 7-196.)
PROPRIETARY TO GE
. 7
EV
7-9-2-1 "Noise Picked up from the Air" on page 7-196
).
All locations:
(See: 7-9-2-6 "Self-Generated Noise (Noise Generated Inside the LOGIQ E9)" on page 7-
197.)
Only in one room/area:
(See: 7-9-2-1 "Noise Picked up from the Air" on page 7-196 and 7-9-2-2 "Noise Received via
the External Cables" on page 7-196.)
Chapter 7 Diagnostics/Troubleshooting
LOGIQ E9 P
ROPRIETARY
7-5-12-5 "Noise" on page 7-71
and
7-9-2-2 "Noise Received via the External
S M
ERVICE ANUAL
for the diagnostic Noise
7 - 195