GE Vivid S60N - Probe Leakage Current Test; Definition; Generic Procedure on Probe Leakage Current

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IRECTION FR091521, REVISION 1 VIVID S60N/VIVID S70N BASIC SERVICE MANUAL
Chapter 10 - Care and Maintenance 10-25
PRELIMINARY
10-6-9 Probe Leakage Current Test
10-6-9-1 Definition
This test measures the current that would flow to ground from any of the probes through a patient who
is being scanned and becomes grounded by touching some other grounded surface.
NOTE: Some leakage current is expected on each probe, depending 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.
10-6-9-2 Generic Procedure on Probe Leakage Current
The most common method of measuring probe leakage is to partly immerse the probe into a saline bath
while the probe is connected to the Ultrasound system and active. This method measures the actual
leakage current resulting from the transducer RF drive.
This test is also known as Patient Auxiliary Current.
1) Turn the Vivid™ S60/Vivid™ S70 OFF:
2) Connect Safety analyzer to wall AC power outlet.
3) Set the Safety analyzer's function switch to “Chassis” or “Enclosure Leakage”.
4) Plug the Vivid™ S60/Vivid™ S70’s power cord into the test meter.
5) Plug the Chassis Ground Probe (saline probe) into the test meter's “CHASSIS” connector.
6) Connect the Ultrasound Probe to the Vivid™ S60/Vivid™ S70.
7) Immerse the Saline Probe in the Saline Solution.
8) Immerse the face of the Ultrasound Probe (imaging area of the probe) into the saline bath.
9) Test opening and closing the ground with the scanner on and off.
a.) Power ON the Vivid™ S60/Vivid™ S70.
b.) After the Vivid™ S60/Vivid™ S70 ultrasound system has completed the boot process, select
the probe to be tested so it is the active probe.
c.) Depress the LIFT GROUND rocker switch and record the highest current reading.
d.) Follow the test conditions and test limits described in Table 10-11 on page 10-17, or Table 10-12
on page 10-17, as applicable for every probe.
The test passes when all readings measure less than the stated limits.
10) Keep a record of the results with other hard copies of maintenance data.
NOTE: Refer to the safety analyzer’s user manual that will be used to perform the tests.
For each combination, the probe must be active to find the worst-case condition.
DANGER
DO NOT USE THE PROBE IF THE INSULATING MATERIAL HAS BEEN
PUNCTURED OR OTHERWISE COMPROMISED.
INTEGRITY OF THE INSULATION MATERIAL AND PATIENT SAFETY CAN
BE VERIFIED BY SAFETY TESTING ACCORDING TO IEC60601-1.