Mindray DC-25, Service Manual

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A-6 ELECTRICAL SAFETY INSPECTION
ELECTRICAL SAFETY INSPECTION
4- Protective Earth Resistance
exposed metal area.
3) Press shortcut key 3. The Protective Earth Resistance test is displayed.
4) Press SOFT KEY 3 to select a test current (1AMP, 10AMP, or 25AMP). The selected
test current is displayed in the upper right corner of the display.
5) Press START TEST to start the test. The test current is applied while resistance and
current readings are taken. This takes approximately 5 seconds.
6) Press the print data key at any time to generate a printout of the latest
measurement(s).

Note
1,Protective Earth Resistance test need not perform If power adapter used for
ultrasound system;
2, When "Over" is displayed for Ohms, this signifies that a valid measurement was
not obtained because either an open connection was detected or that the measurement
was not within range. Readings greater than 9.999 Ohms will be displayed as Over.

Failure
Once it reaches the limitation, stop using equipment. Check the protective earth
connection between Protective Earth terminal and Protective Earth Metal enclosure and
equipotential terminal; Retest and inform the Customer Service Engineer for analysis and
disposal if still fail.
LIMITS
ALL COUNTRIES R = 0.2
Ω
Maximum