Hioki FT3151 - Before Returning for Repair

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Before Returning for Repair
4.5 Before Returning for Repair
Symptom Checkpoint
When the MEASURE button is
pressed while nothing is connected
to the measurement terminals, the
galvanometer may register to the
end of the scale.
This is not a defect.
When the MEASURE button is
operated, a high-pitched tone from
the inside of the instrument will be
heard.
This is not a defect.
Even when the resistance dial
is turned, the needle of the
galvanometer deects to the left side
of zero.
The earth resistance is higher than
the measurement range.
Check the earthing condition of the
earth electrode.
The needle of the galvanometer
goes off scale to the left.
The measurement leads may be
broken or the ground line may not be
connected to the ground.
Check the continuity of the
measurement leads using circuit
tester. (check of disconnection)
The needle of the galvanometer is
uctuating.
A high-voltage has maybe been
generated or the earth resistance of
the auxiliary earthing rods may be
high.
Check the earth voltage and the
auxiliary earth resistance.
The measurement with the earthing
net placed over the asphalt surface
is not possible.
Because asphalt is a non-conductor
of electricity, the measurement is not
possible even when the earthing net
is used.