Revision:1.0(2023-01-12)
442
Electrical Safety Inspection
7-Patient leakage current test under the condition of applied parts plus mains voltage
4. Press a proper soft key to select the required applied part test and output configurations.
5. Tap START TEST (soft key 1) to start the test.
6. Press the print key to print the latest measurements.
Figure9–4 Leakage current on the major applied part
• NOTICE
1. Except the probe, if the device uses ECG, the patient leakage current of the applied parts
plus mains voltage should also be tested.
2. If all applied parts pertain to the same type, connect all applied parts and obtain a single
measurement value. If the applied parts pertain to different types, test all applied parts of the
same type respectively by type in auto or step mode.
• FAIL
Check whether the application parts are damaged and replace the failed part.
Check whether the ECG is damaged and replace the failed part.
Check whether the power unit is damaged. If it partially fails, replace the failed part.
Check whether grid power cables are bent, in poor contact, or damaged.
Test the AC current output on the wall. Check that the ground is good and no cable exceptions
occur. Notify the user or owner to correct related deviations. Check whether any surrounding
operating power output can be used for substitution.
Replace the probe to check whether the failure is caused by the probe.
If the leakage current test on the new component fails and the problem cannot be rectified,
submit a safety failure report to prove the system problem and remove this component.
Diagnostic Ultrasound System
Service Manual
9 Appendix
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