14
b
a/4
D
a/2
b/4
B
E
A
b/4
C
Measurements points: A, B, C, D & E
Direction of measurements: x & y
y
x
fig. 04
2.11. Audible Alarm
The MTD-20KWe has an audible alarm circuit to avoid false measurement
records. If, due to any reason, the current is lower than the value required to
perform reliable measurements, or if there is no current flowing between
H(Ec) and E(Exc), the alarm circuit will be activated and will emit an audible
intermittent signal. When the operator is in the field during measurement
and hears the intermittent "beep" sound, he must check the connections to
the rods and to the earth tester terminals, as well as the wires continuity
(possibly, a wire may be cut off). If there isn’t any abnormality in the
connection or in the wires, it is possible that the soil resistance is
abnormally high, causing an excessively high diffusion resistance of the
auxiliary rods. That resistance could be improved by watering the auxiliary
rods, or by inserting several interconnected rods. The battery status must
also be checked.
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