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7. Abnormalities indications on the display
If the
TM-25R
identifies any abnormality causing the measurements to be
excessively inaccurate, or not possible at all, a warning message will be
shown on the display, allowing the operator to identify and correct the
problem.
7.1. Excessively high earth resistance
If the system’s resistance is exceptionally high (above 300 ), and
therefore beyond the equipment range, the following message will
appear: “
R > 300
”
7.2. Excessively high resistance in the auxiliary
rods
If, by any reason, there is no current between
S
and
H
, or if resistance on
the H pole is too high, the display will show “
Check H-pole
”. The reason
may be a wrong connection or excessive high-diffusion resistance on the
H pole. Check the installation to correct the problem. If the problem is
being caused by excessive resistance, watering the rods or inserting
several interconnected rods may reduce the resistance, allowing
measurements to take place correctly. Also check battery charge status.
IMPORTANT:
Take into account that if the grounding resistance of the
auxiliary electrodes used exceeds the maximum admissible by the
instrument (2000 ), the measurements taken will be affected by a
significant error. If it is suspected that the measurement is affected by this
condition, the grounding resistance of each auxiliary rod should be
measured with a conventional earth tester so as to avoid reporting wrong
values.
8. Auto power-off
The
TM-25R
auto-turns off after 15 minutes of inactivity.
