Part III Appendix
Electrical Safety Maintenance 268
Electrical safety check
7-Patient leakage current under the condition of applied parts plus mains voltage
1) Except the probe, if the device uses ECG or PCG, the patient leakage current should be tested.
2) If all applied parts pertain to the same mechanical type, connect all applied parts and obtain a
single measurement value. If the applied parts pertain to different mechanical types, test all
applied parts respectively by type in auto or step mode.
Check whether the applied parts are damaged and replace the failed part.
Check whether the ECG or PCG is damaged and replace the failed part.
Check whether the power unit is damaged. If it partially fails, replace the corresponding part.
Check whether major cables are bent or damaged, or connected unreliably.
Test the 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 main console.
If the leakage current test on the new unit fails and the problem cannot be rectified, submit a
safety failure report to prove the system problem and remove this unit.
If the test fails on other units, stop using the device and notify customer service engineers to
analyze or handle the problem.
Applicable to the ECG input and probe of the BF type device:
5000 μA
Electrical safety check
8-Patient auxiliary current test
Overview
The patient auxiliary current test is performed between the selected ECG slot and remaining ECG
slots. All measurements can adopt the RMS value or DC value.
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