Revision:1.0(2023–5–17)
82
Electrical Safety Inspection
4-Patient leakage current test
• Fail
Check whether the probes are damaged and replace the failed ones.
Check whether major cables are bent or damaged, or connected unreliably.
If the test fails, stop using the device and ask customer service engineers to analyze or handle
the problem.
Electrical Safety Inspection
5-Patient leakage current test under the condition of applied parts plus mains voltage
Overview
Patient leakage current test under the condition of applied parts plus mains voltage: With
applied parts plus 110% mains voltage, select the applied part terminal by limiting the
impedance value. The leakage current test is performed between the selected applied part and
the ground. Under the displayed normal polarity and reversed polarity conditions, measure the
leakage current for the applied part plus 110% mains voltage.
The following output conditions are required for this test:
Normal Polarity;
Reversed Polarity
Test process
• Preparations
Press CAL (soft key 2) to perform calibration for the test of major application parts.
1.
Disconnect all the test connections.
2. Press CAL to start calibration, as shown in the following figure.
If the calibration fails, the saved value is used until an acceptable calibration value appears.
The Esc/Stop key is invalid during calibration.
3. After the calibration is completed, the patient leakage current test under the condition of
applied parts plus mains voltage appears on the screen.
• WARNING
1. If two beeps are generated per second during the calibration, high voltage occurs on the
applied part terminal.
2. High voltage may occur on the applied part terminal during the measurement.
• Performing the test
Diagnostic Ultrasound System
Service Manual
8 Appendix
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