Revision:1.0(2023-01-12)
435
Electrical Safety Inspection
2-Device shell and accessories
No loose or missing parts, such as buttons, knobs and
terminals
• Associated check
Shell and accessories
No abnormal sound, such as cracks inside the device
No abnormal smells, such as the smell of scorch or smoke
from the air vent
No audio prompts regarding device bugs or precautions for
the operator
3-Device labeling
Test process
Check whether labels provided by the device vendor are complete and legible.
• Labels on the main unit
• General warning labels
• Other warning labels
• No-press labels
Electrical Safety Inspection
4-Protection ground impedance
Overview
Prerequisite: L1 and L2 are disconnected.
To measure the protection ground impedance, connect a red lead to the protection ground end,
protection ground metal shell, or equipotential pole of the device under test. Press the soft key 3
to select the test current. You can switch among 1 A, 10 A, and 25 A. During the test, the output
power of the front panel is turned off.
Test process
• Preparations
1. Press AMPERRES (soft key 3) to select the test current for measuring the protection ground
impedance.
2. Connect the test lead between the red input and the green input.
3. Press CAL LEADS. The 601 PRO tester will measure the lead impedance. If the measured
value is less than 0.15 Ω, the tester saves the measured value and deducts it from all ground
impedance values that are measured under the calibration current.
Diagnostic Ultrasound System
Service Manual
9 Appendix
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