76
Ground Resistance Tester Model 6471
To reduce R
H
, you can add one or more electrodes, 2 meters apart from each
other, in the
H (Z)
leg of the circuit, or increase the test voltage.
To reduce R
S
, you can add one or more electrodes, 2 meters apart from each
other, in the
S (Y)
leg of the circuit.
To reduce the resistance of the electrodes, you can also drive them deeper, pack
the ground around them well, or dampen them with water.
10.1.4 Out of Limits Indicators
This flashing during a
passive
measurement means that the device
has detected the presence of an external voltage exceeding 42V on
the terminals and that the measurement is impossible.
This flashing during an
active
measurement means that the operat
-
ing limits have been exceeded.
If this symbol remains lit during an active measurement, it means
that the values measured are subject to large fluctuations or that
there is an incorrect connection.
NOISE
The display of an indefinite value for a passive measurement indi-
cates that measurement current I
ES
or I
SEL
or voltage U
S-ES
is too low.
The display of the NOISE symbol indicates that a stray external voltage is likely to
interfere with the measurement. You should change to manual mode and change
the measurement voltage and/or frequency in order to make a valid measurement.
After the measurement has started there are indicators of when:
•
Values R
H
and/or R
S
are too high,
•
Measurement current I
H-E
, I
ES
or I
SEL
is too low,
•
The instability of the measurement is large.
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