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Electrical Leakage - Philips M3921A Service Manual

Patient monitors.
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Electrical Leakage

Earth Leakage Current
(A3 only)
Enclosure Leakage
Current
Performance Verification
The following tests verify the electrical leakage of the monitor:
Earth Leakage Current (A3 only)
n
Enclosure Leakage Current
n
Patient Leakage Current
n
Patient Source Current, with Mains Voltage on the Applied Part
n
Perform all leakage tests any time the unit is opened.
This test is in compliance with IEC 601-1 (Earth Leakage Current). In
locations where mains voltage is 100-120 volts, the applied voltage is 132
volts. In locations where mains voltage is 220-240 volts, the applied voltage is
264 volts. The applied AC frequency should be the same as the local mains
(50 or 60 Hz).
All measurements shall be made with the power switch in both
positions.
1.
Connect the monitor AC plug to the electrical safety analyzer as recommended
by the analyzer operating instructions.
2.
Perform test as recommended by analyzer operating instructions.
Earth leakage current is measured under various conditions of the AC mains
and protective earth conductor. For each condition, the measured leakage
current must not exceed that indicated below
Table 7
Earth Leakage Current Values (A3 Only).
Test
Condition
Normal
1
S.F.C
Open
Supply
1. S.F.C = Single Fault Condition
This test is compliance with EN60601-1 (Enclosure Leakage Current). Test at
110% of the nominal line voltage.
1.
Connect the A3's AC mains power cord to the analyzer as recommended by the
analyzer operating instructions.
2.
Using the appropriate test cable, connect the analyzer to the snap nearest to the
handle fixing screw as shown in the following photograph.
Polarity
Allowable Leakage Current
Normal
Reversed
Normal
Reversed
Safety Tests
and
ON
OFF
300 µA
300 µA
1000 µA
1000 µA
31

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