Electrical safety tests
Ultrasound System – Common Service Information 4-37
Direction 5444964-100 English Rev. 5
Generic procedure on probe leakage current (continued)
NOTE: Each probe will have some amount of leakage, dependent on its
design. Small variations in probe leakage currents are normal
from probe to probe. Other variations will result from differences
in line voltage and test lead placement. It is abnormal if no
leakage current is measured. If no leakage current is detected,
check the configuration of the test equipment.
The ultrasound probes imaging area is immersed in the Saline
solution along with a grounding probe from the Electrical Safety
Analyzer to complete the current path.
This test is also known as Patient Leakage Current.
1. Turn the Ultrasound system OFF
2. Connect the Safety analyzer to AC wall outlet.
3. Set the Safety analyzer's function switch to “Chassis” or
“Enclosure Leakage”.
4. Plug the Ultrasound system’s power cord into the Electrical
Safety Analyzer.
5. Plug the Chassis Ground Probe (saline probe) into the
Electrical Safety Analyzer's “CHASSIS” connector.
6. Connect the Ultrasound Probe to the Ultrasound system.
7. Immerse the Saline Probe in the saline solution.
8. Immerse the Ultrasound probe’s face (imaging area of the
probe) into the saline solution.
CAUTION
To avoid probe damage and possible electric shock, do not
immerse probes into any liquid beyond the level indicated
in the probe users manual.
Do not touch the probe, conductive liquid or any part of the
Ultrasound system under test while doing the test.
CAUTION
Equipment damage possibility.
Never switch the Polarity and the status of Neutral when
the Ultrasound system is powered ON.
Power off the Ultrasound system, allow the stored energy
to bleed down, and turn the circuit breaker off BEFORE
switching the "POLARITY" switch and/or the "NEUTRAL"
switch on the Electrical Safety Analyzer to avoid possible
power supply damage.
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