Philips M3921A, Service Manual

Page: 43 / 150

Safety Tests
Performance Verification 31
Electrical Leakage
The following tests verify the electrical leakage of the monitor:
n
Earth Leakage Current (A3 only)
n
Enclosure Leakage Current
n
Patient Leakage Current
n
Patient Source Current, with Mains Voltage on the Applied Part
Perform all leakage tests any time the unit is opened.
Earth Leakage Current
(A3 only)
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
ON
and
OFF
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).
Enclosure Leakage
Current
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.
Test
Condition
Polarity Allowable Leakage Current
Normal
Normal 300 µA
Reversed 300 µA
S.F.C
1
Open
Supply
1. S.F.C = Single Fault Condition
Normal 1000 µA
Reversed
1000 µA