Philips M3921A, Service Manual

Page: 46 / 150

Safety Tests
34 Performance Verification
Table 9 Patient Leakage Current Values
Patient Leakage
Current, with Mains
Voltage on the Applied
Part
This test measures patient leakage current in accordance with EN60601-1,
Clause 19, for Class I, type CF equipment. In this test, 110% of mains voltage
is applied between each patient connection and earth (power ground). Patient
leakage current is then measured from any individual patient connection to
earth.
Warning AC mains voltage is present on the applied part terminals
during this test. Exercise caution to avoid electrical shock
hazard.
Table 10 Safety Tests - Patient Leakage Current, with Mains
Voltage on the Applied Part
Test Condition Polarity
Allowable Leakage
Current (Max.)
Type CF
Normal
Normal 10 µA
Reversed 10 µA
S.F.C.
1
(Open Supply)
(A1 Only)
1. S.F.C. = Single Fault Condition
Normal 50 µA
Reversed 50 µA
S.F.C.
1
(Open Earth/Ground)
(A3 Only)
Normal 50 µA
Reversed 50 µA
Test or “Inspection” to Perform Expected Test Results
Patient Leakage Current - AC
See “Safety Test Diagram - Patient
Leakage Current - AC” on page 35 Maximum leakage current = x
<= 50
m
A @ 250V (IEC601-1 or UL2601-1)
Test at 110% of the nominal line voltage.