Care and Maintenance
4-24 Ultrasound System – Common Service Information
Direction 5444964-100 English
 Rev. 5
Grounding continuity
Measure the resistance from the third pin of the attachment plug 
to the exposed metal parts of the case. The ground wire 
resistance should be less than 0.2 ohms. Reference the 
procedure in the IEC60601-1-1 and/or IEC62353.
Figure 4-2. Ground continuity test
DANGER Electric Shock Hazard!
The patient or operator MUST NOT come into contact with the equipment 
during this test.
1. Ultrasound System
2. Ground Pin
3.  Ohmmeter or Electrical Safety 
Analyzer
4.  Accessible Metal Part such as:
• Potential equilibrium connector
• Monitor housing
• Probe connector
CAUTION
Lacquer is an isolation barrier! Measure only on blank 
accessible metal parts.