Operation Manual

24 GMC-I Messtechnik GmbH
I
P
Patient Leakage Current
Applications
As a rule, measurement of leakage current from the applied part
to PE must be performed in accordance with IEC 60601.
No separate measurement is normally required for type B
applied parts. The applied parts are connected to the housing
(see figures), and are also measured during housing
leakage current measurement, to which the same permissible
values apply.
Separate measurement of leakage current from type B applied
parts only has to be performed if it is specified by the
manufacturer (see accompanying documentation).
For type BF or CF applied parts, measurement is required for all
interconnected patient ports used for a single function of the
applied part, or measurement must be executed as specified by
the manufacturer.
When testing measuring instruments with several applied parts,
each must be connected, one after the other, and measuring re-
sults must be evaluated on the basis of the limit values. Applied
parts which are not included in the
measurement must be kept potential-free.
Definition of Patient Leakage Current
Current which flows from power packs and exposed conductive
parts of the housing to the applied parts.
The AC and the DC component of the current is measured.
Direct Measurement Method
The device under test is operated with mains power. Current
which flows through the applied parts to earth at the mains side of
the device connection is measured. The value which has been
adjusted to nominal line voltage is displayed (see section 4.3).
Type of Test Current Parameter
– DIR Patient leakage current, direct (applied parts plugged in)
Mains Polarity Parameter
Polarity can be reversed for measurements during which the
mains are connected to the test socket.