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Chapter 4 Measurement Procedure
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NOTE
The simplified measurement (2-pole method)
makes use of an existing earthing body.
Itshouldonlybeusedincaseswherethe
auxiliary earthing rods cannot be driven into
the ground.
The existing earthing body must have a
sufficiently lower resistance than the earthing
body to be measured.
When the 2-pole method is used, the
measurement current of the 3151 is kept to 3
mA or less, so that the leakage current circuit
breaker of a household power supply will not
be tripped when the grounded side of an AC
outlet is used as an existing earthing body.
When using the simplified measurement
method, the resistance of the existing earthing
body is added to the measurement result.
For measurements in the range of 10 Ω and
below, you should always use the normal
measurement (3-pole method).
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