42
● Incapable of measuring earth resistance
Voltages of 20V or more are being applied between the E and S(P)
Terminals. (Fig.68)
The upper limit of the measuring range may be exceeded. (Fig.69)
Select an upper Range.
The Test Leads may be loose. (Fig.69)
Check the connections again.
● Marks shown in Fig.70 and 71 are displayed at Re measurements
The Rh or Rs value is more than (500+Re×100)Ω or 50kΩ or more;
it results in inaccurate measurement. Check the condition of the
Earth Spikes stuck into the ground. (Refer to
9-1 Earth Resistance
Measurement
)
● The LCD reads ρ=OL or Rg =OL at earth resistivity measurements.
Re measurements. (Fig.72)
The Rg value exceeds the upper limit of the Range. Select an upper Range
and test again. At earth resistivity measurements, the display reads OL
when the intervals between the spikes become longer although a proper
Range is selected. Max indication of the earth resistivity value is 1999kΩ .
(Refer to Measuring range and tolerance described at
4. Specification
and
9-2. Earth Resistivity (ρ) Measurement
.)
Fig.
68
Fig.
69
Fig.
70
Fig.
71
Fig.
72
