Protective Earth Resistance Test - Brainlab EXACTRAC INFRARED MONITORING Clinical User Manual

8.3.4

Protective Earth Resistance Test

What is a PE During a PE resistance test, electrical impedance between the defined reference point and acces-
Resistance Test? sible metal components (camera, monitor arm, user panel, handle, computer cabinet) should be
measured in order to ensure that they are protectively earthed in accordance with IEC 60601-1.
• The limit value is 0.2 Ω for the initial test. If the electrical impedance between the reference
Measurement
Values
• The required current for the PE resistance test varies for different countries. As a default value
• For countries where a different minimum is specified (e.g. DIN VDE 0751-1 for Germany
Performing a PE
Resistance Test
Sample Protocol A sample test protocol is shown below:
Clinical User Guide Rev. 1.1, ExacTrac Infrared Monitoring Ver. 1.0
point and ExacTrac, for example, rises above the specified level, it must be reduced.
Brainlab recommends using 25 A.
requires only 0.2 A), local regulations apply.
Steps
1. Disconnect the power and data cable from the device to be tested.
2. Ensure that there is no contact between the cables and the devices.
3. • Measure the electrical impedance between the PE connection of the device and the
potential equalization bar or star point ground of the treatment room.
• If an automatic test device is not available, the electrical impedance can be evaluated
by feeding a test current of maximum 25 A AC into the PE network and measuring the
voltage drop. The electrical impedance is then determined by:
I TestCurrent
Measuring Point
(MP)
Infrared camera
Monitor
Computer cabinet
housing
U
Measured
------------------------ -
R =
I
Test
U TestVoltage
Electrical Impedance
(Ω)
87