Out Of Limits Indicators - AEMC 6470-b User Manual

To reduce R
other, in the H (Z) leg of the circuit, or increase the test voltage.
To reduce R
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

NOISE
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
• Measurement current I
• The instability of the measurement is large.
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, you can add one or more electrodes, 2 meters apart from each
H
, you can add one or more electrodes, 2 meters apart from each
S
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.
The display of an indefinite value for a passive measurement indi-
cates that measurement current I
and/or R are too high,
H S
, I
H-E
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or I
ES
or I is too low,
ES SEL
Ground Resistance Tester Model 6470-B
or voltage U is too low.
SEL S-ES
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