GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 2 - Site Preparations 2 - 7
2-2-3 EMI Limitations
Ultrasound machines are susceptible to Electromagnetic Interference (EMI) from radio frequencies, 
magnetic fields, and transients in the air or wiring. They also generate EMI. The Vivid 7 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. 
The presence of a broadcast station or broadcast van may also cause interference.
See Table 2-5 on page 2-8 for EMI Prevention tips.