12 General
DRAFT 22.04.2008
ARCADIS SP00-000.814.09.01.02 Siemens
11.07 CS PS SP
Page 12 of 78
Medical Solutions
NOTE
For evaluation purposes, the first measured value and the
values documented during maintenance or safety checks
must be compared to the measured values. A sudden or
unexpected increase in the measured values may indicate a
defect in the protective conductor connections - even if the
limit value of 0.2 ohms is not exceeded. (Protective conduc-
tor or contacts).
The measurement must be performed according to DIN VDE 0751, Part 1 (see ARTD Part
2). The protective conductor resistance for all touchable conductive parts must be mea-
sured during the normal operating state of the system.
Make sure that control cables or data cables between the components of the system are
not mistaken for protective conductor connections.
During the measurement, the power cable and additional connection cables which also
create the protective conductor connection between system parts (e.g. monitor cable
between the basic unit and monitor trolley) must be moved section by section to detect
cable breaks.
The protective conductor resistance must not exceed 0.2 Ohms.
Fig. 1: Measuring circuit for measuring the protective conductor resistance for units that are
disconnected from power, in compliance with DIN VDE 0751-1/2001-10, Fig. C2.
Pos. 1 = System
Pos. 2 = Application part type B (if available)
Pos. 3 = Measurement setup (integrated into measuring device)
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