Appx.2
Earth resistance
• Presence of disturbance factors
There are disturbance factors such as effects from earth voltage
and an auxiliary earthing electrode in the measurement of earth
resistance.
The earth voltage caused by a leakage current from an
instrument that has been connected to the earthing electrode
superimposes over the signal to be detected by the earth tester,
affecting measured values. In addition, if the earth resistance of
the auxiliary earthing electrode is high, the measurement current
is reduced, making the instrument susceptible to noise such as
earth voltage.
This instrument employs a system that is less susceptible to
these disturbances and allows accurate measurement under
adverse conditions.
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