Revision:1.0(2023-01-12)
436
Electrical Safety Inspection
4-Protection ground impedance
4. If the calibration fails, the saved value is used until an acceptable calibration value appears.
• WARNING
In the ground impedance test, the device under test (DUT) must be connected to the output end
on the front panel of the 601 PRO tester. If the DUT ground impedance test fails, terminate the
test and mark that the device is invalid.
• Performing the test
1. On the main panel, insert the DUT plug into the auxiliary output on the front panel of the 601
PRO tester when there is no power on the output end.
2. Insert the red lead of the 601 PRO tester into the red input (on the front panel of the 601 PRO
tester), and the other end to the protection ground or bare metal part of the device.
3. Press 3 to show the protection ground impedance test.
4. Press AMPERES to select the test current (1 A, 10 A, or 25 A). The selected current appears
in the upper right corner of the display in real time.
5. Press the soft key corresponding to START TEST to apply the test current and show the
impedance and current values. The test lasts about 5s.
6. Press the print key to print the latest measurements.
• NOTICE
When the impedance exceeds the standard value, no valid measurement result is obtained due
to an open-circuit connection or because the tested object exceeds the measurement range.
When the read value exceeds 9.999Ω, it is prompted that the value exceeds the standard value.
• FAIL
Stop using the device once its impedance reaches the limit. Check the protection ground
connections between the protection ground terminal and the protection ground metal shell and
equipotential pole. Perform the test again. If the device fails the test again, stop using the
device and notify customer service engineers to analyze or handle the problem.
Limit
All countries: R = 0.2Ω (maximum).
Diagnostic Ultrasound System
Service Manual
9 Appendix
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