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“
”displays.
Danger
The measurement cannot be made when a warning message
appears on the Main Screen. Voltages more
than 20V exist between the instrument terminals.
Earth resistivity
（
ρ
）
measurement
Earth resistivity indicates the geology and physical quantity of the calculated and designed earthed system. The
following measurement procedure employed is developed by F.Wenner used to measuring earth resistivity.
Earth resistivity is calculated according to the following formula:
ρ
＝
2
aR
ρ
：
mean value of earth resistivity
（
· m
）
.
a
：
intervals between earth spikes
（
m
）
.
R
：
measured resistance
（
）
Terminals to be used: E, ES, S, H Terminals
Test Leads: connect to the E, ES, S, H Terminals.
Auxiliary Earth Spike: 4 pcs
Measurement method is shown as follows:
（
1
）
Press
key to select measurement method: Earth Resistivity;
（
2
）
Press
key to select measurement frequency (display in auxiliary display part);
（
3
）
Connection of Auxiliary Earth Spikes and Test Leads(See figure
12
)
Stick the four Auxiliary Earth Spikes into the ground deeply. They should be aligned at the same interval of
“a”. The
depth should be 5% or less of the interval
“a” between the spikes (e.g. when the earth spike interval is 5 meters, the
earthed depth should be less than 25cm). If the Spikes stuck too deep, it may result in inaccurate earth resistivity
measurement. The interval
“a” should fall within the scope of 1.0m
～
30.0m.
Starting from the E,ES,S,H terminals of the Instrument, connect the Test Leads
（
black
）
（
green
）
（
red
）
（
blue
）
in
sequence of with the Earth Spike.
