OmegaPATPlus / BetaPATPlus Measurements
26
6 Measurements
6.1 Earth bond resistance
This test ensures that the connections between the protective conductor terminal in the
mains plug of the appliance and any accessible conductive parts of the appliance (metal
housing) are satisfactory and of sufficiently low resistance. This test has to be
performed on Class 1 (earthed) appliances.
A high current is normally used to check that the connections will operate correctly
under fault conditions. In some sensitive electronic equipment such as computers and
other information technology equipment that contain a functional earthing arrangement,
a high current test can damage the equipment. In this situation, a 200 mA test current is
used to prevent damage to the internal components of the appliance.
The instrument measures the resistance between test socket‘s PE terminal and earth
bond clip (connected to socket S of the appliance).
Measurement of earth bond resistance of class I appliance
6.1.1 How to perform earth bond resistance measurement
From the
Main menu
, select
Single test
and then select
Earth bond
by using
¿
and
À
cursor keys and press ENTER key to confirm.
Earth bond menu
is displayed.
Earth bond menu
Measurement parameters are detailed in the top right corner of the display. The
following parameters can be adjusted:
Ì
nominal test current,
Ì
high limit resistance value,
Ì
measurement
duration.
