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4535 612 34161 HD3 Service Manual Page 127
CSIP Level 1 Performance Tests: Electrical Safety
• The Transducer Leakage Current test checks a transducer for electrical leakage while it is
connected to the ultrasound system. The system sends normal operating voltages to the
transducer, which is tested for leakage. See “To test transducer leakage current” on
page 133.
• The Transducer Isolation Leakage Current test applies AC mains voltage to the leads to
check a transducer for electrical leakage. See “Transducer Isolation Leakage Current Test”
on page 134.
The limits referenced in these tests are prescribed by UL, CSA, and IEC. Local regulations may
require additional tests.
Chassis to
Ground
Resistance Test
This test checks the entire system for electrical resistance between the chassis and ground.
Figure 6-1 shows the basic electrical concept of the ground resistance test. Use a safety analyzer
and complete “To test the system for resistance between chassis and ground” on page 129.
WARNING Some users routinely perform a safety-earth or ground-bonding test at currents in excess of
10 A. Test currents in excess of 1 A will likely exceed the impedance limit specification, and can
damage the RFI protection finger contacts. Exposed metal on the transducer assembly, including
the connector, are for RFI and are not safety grounds.
CAUTION Do not use automated test equipment that will interrupt power to the ultrasound system with-
out allowing the user to power down normally. Interrupting the system power while the system
is powered-on can result in corrupted files and could render the system inoperative.