Electrical Tests Periodic Maintenance
3 - 50 046-006272-00 A7â„¢ Service Manual
3.17 Electrical Tests
NOTE: Perform electrical safety inspection after servicing or routine
maintenance. Before the electrical safety inspection, make sure all the
covers, panels, and screws are correctly installed.
NOTE: The electrical safety inspection should be performed once a year.
3.17.1 Auxiliary Electrical Outlet Test
Verify the mains voltage is present at each auxiliary outlet when the anesthesia machine is connected
with power.
3.17.2 Electrical Safety Inspection Test
1. Perform protective earth resistance test:
a. Plug the probes of the analyzer into the protective earth terminal and equipotential
terminal of the AC power cord.
b. Test the earth resistance with a current of 40 A.
c. Verify the resistance is less than 0.1ohms (100 mohms).
d. Plug the probes of the analyzer into the protective earth terminal of the AC power cord
and the protective earth terminal of any auxiliary outlet. Repeat steps b and c.
e. If the resistance is larger than 0.1ohms (100 mohms) but less than 0.2ohms (200
mohms), disconnect the AC power cord and plug the probe that is previously plugged in
the protective earth terminal of the AC power cord into the protective earth contact of
the power outlet. Repeat steps a to d.
2. Perform the following earth leakage current tests:
• normal polarity;
• reverse polarity;
• normal polarity with open neutral; and
• reverse polarity with open neutral.
3. Verify the maximum leakage current does not exceed 300 μA (0.3 mA) in the first two tests.
While for the last two tests, verify that the maximum leakage current does not exceed 1000
μA (1 mA).
NOTE: Make sure the safety analyzer is authorized by certificate organizations
(UL, CSA, or AAMI etc.). Follow the instructions of the analyzer
manufacturer.
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