Philips M3921A Service Manual page 46

Safety Tests
Patient Leakage
Current, with Mains
Voltage on the Applied
Part
Warning
34
Table 9 Patient Leakage Current Values
Test Condition
Normal
1
S.F.C. (Open Supply)
(A1 Only)
1
S.F.C. (Open Earth/Ground)
(A3 Only)
1. S.F.C. = Single Fault Condition
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.
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 or "Inspection" to Perform
Patient Leakage Current - AC
See "Safety Test Diagram - Patient
Leakage Current - AC" on page 35
Allowable Leakage
Polarity
Normal
Reversed
Normal
Reversed
Normal
Reversed
Expected Test Results
Maximum leakage current = x
<= 50 mA @ 250V (IEC601-1 or UL2601-1)
Test at 110% of the nominal line voltage.
Current (Max.)
Type CF
10 µA
10 µA
50 µA
50 µA
50 µA
50 µA
Performance Verification