Philips Avalon FM20, Service Manual

Page: 68 / 260

7 Testing and Maintenance
68
NOTE
All values for current and voltage are the root mean square (r.m.s.) values, unless otherwise stated
You can find metal parts of the device:
•
In the top cover (accessed by opening the paper drawer).
• In an interface slot located in the bottom housing (you need to remove the interfaces if they are
fitted).
Refer to the picture showing accessible metal parts under “S(2): Sum of Functional Earth and
Equipment Leakage Current Test - Normal Condition” on page 66.
S(4): Applied Part Leakage Current, Mains on Applied Part
NOTE
During measurement of the Applied Part Leakage Current it is possible that the measured current can
exceed the allowed limit (per IEC/EN 60601-1 or IEC/EN 62353).
This can occur when the safety tester is connected to more than one connector simultaneously, that is,
either to two fetal sensor connectors at the same time, or to a fetal sensor connector and the SpO
2
connector at the same time during the applied leakage current measurement.
The connectors for the fetal sensors and for SpO
2
are independently functioning connectors.
Although there are individual connectors on the front-end, internally those parameters use the same
electrical insulation interface and are hard wired to each other. This results in an electrical short of
those connectors during measurement if a test current is applied simultaneously. Therefore this should
be avoided.
Due to the combined insulation interface, it is sufficient to connect to only one parameter interface
(that is, one of the fetal sensor connectors or SpO
2
) of the fetal sensor/SpO
2
measurement block. This
avoids a short and the potential of exceeding the limit for the current.