Tests 3 Testing and Maintenance
51
S(2) Protective Earth Continuity
Expected test results:
♦ With mains cable, maximum impedance x = 100 mOhms (IEC 60601-1 and UL2601-1)
This measures impedance of Protective Earth (PE) terminal to all exposed metal parts of Instrument
under Test (IUT), which are for safety reasons connected to the Protective Earth (PE). Test current 25
Amp applied for 5 to 10 seconds.
S(3) Patient Leakage current - Single Fault Condition (S.F.C.) mains on applied part
Expected test results:
♦ Maximum leakage current, x = 50µA @ 250V (IEC60601-1 and UL2601-1)
Measures patient leakage current from applied Part to earth caused by external main voltage on applied
Part with switch S5 open and closed. Each polarity combination possible is tested using S2 and S6.
This test is applicable for every measurement input .
50 Hz 25 A or 1.5 Ir
Ohm
L (N)
N (L)
PE
Instrument under test
Applied part
Insulating pad
Ri
6V
(*)
(*) If equipotential connection present : measure also
with yellow/green E.P. conductor connected.
Insulating pad
R
S6
(*) Not present in Class 2
N (L)
Instrument under test
Applied part
PE
S1
S2
L (N)
S4
(*)
Signal part
in- and/or
output
L (N)
N (L)
S5
MD
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