KYORITSU 4106 User Manual

Page 35

(5) Measured resistances at simplified measurements
Two-Wire method is used for the simplified measurements. In this

method, earth resistance of the earthed electrode (re) connected to the

“S(P)” Terminal is added to the true earth resistance “Rx” and shown as

an indicated value “Re”.

Re (indicated value) = Rx + re

If the Re is known beforehand, true earth resistance value Rx is

calculated as follows.

Rx = Re -re

Note) The “re” cannot be canceled by the setting of Rk.

9-2 Earth Resistivity (ρ) Measurement

CAUTION

● The measured results may be influenced by induction if measure-ments

are made with the Test Leads twisted or in touch with each other.
When connecting the Probes, they should be separated.

Making a setting of the interval between Auxiliary Earth Spikes first and
measuring the earth resistances with the 4 Auxiliary Earth Spikes stuck into
the ground at even intervals. Then the instrument can calculate and display
earth resistivity on the LCD automatically.

Terminals to be used : E, ES, S(P), H(C) Terminals
Test Leads

: connect to the E, ES, S(P) and H(C) Terminals

Auxiliary Earth Spike : 4 pcs

(1) Setting of Wiring System
Select “Wire (ρ)” with reference to “8-2-2 Setting for Measurement

Method” in this manual.

Note) The instrument doesn't accept any setting change on “Rk” while

measuring earth resistivity (ρ).

(2) Connection of Auxiliary Earth Spikes and Test Leads
Stick the four Auxiliary Earth Spikes into the ground deeply. They should

be aligned at an interval of 1-30m. The depth should be 5% or less of
the interval between the spikes.