30
Measuring Earth Resistance Precisely
(Precise Measurement, 3-Pole Measurement Method)
Earth voltage check
Set the range selector to ~V to check
an earth voltage. Do not press the
MEASURE button at this time.
CAUTION
• If the MEASURE button is pressed, no earth voltage can
be measured. Although the needle of the galvanometer
may move or go off-scale high, this is not a defect.
• If the earth voltage is 10 V or more, measure the the
earth voltage separating the earthing body from the
electrical installation or switching the power line off to
minimize the earth voltage. Also, if the earth voltage is
high, take care that a risk of an electric shock exists.
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