GE 5935000E10, Basic Service Manual

Page: 242 / 778

D
IRECTION
5750007-1EN, R
EV
. 1 LOGIQ E10 B
ASIC
S
ERVICE
M
ANUAL
7 - 36 Section 7-4 - Troubleshooting
7-4-2 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.
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 appears
.
Table 7-12 Noise Conditions
The noise is present Determine If the test fails...
All the time n/a
See "Noise picked up from the air" on page 7-37 and "Noise
received through the external cables" on page 7-37 .
After some time of use
The amount of time
between initial use of
the and when the noise
begins.
See "Noise picked up from the air" on page 7-37 .
CertaIn times of the day or night
The time of day or night
along with the duration. See "Noise picked up from the air" on page 7-37 and "Noise
received through the external cables" on page 7-37 .
At all locations in the hospital n/a See "Noise picked up from the air" on page 7-37 .
Only in one room or area The room or area
See "Noise picked up from the air" on page 7-37 and "Noise
received through the external cables" on page 7-37 .
From time to time with no special
pattern of time is observed
n/a
See "Noise picked up from the air" on page 7-37 and "Noise
received through the external cables" on page 7-37 .