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of correct measurement due to high value of earth resistance compared with auxiliary earth resistance.
Danger
The measurement cannot be made when a warning message
appears on the Main Screen. Voltages more
than 20V exist between the instrument terminals.
Precise measurement (4 POLE)
T
he“ ES” Terminal is also used with the other terminals used at the 3-pole Precise measurements. In this case, more
precise results can be obtained because auxiliary earth resistances of the measured earth resistances are excluded;
moreover, resistance of the Test Leads connected to the E Terminal can be canceled.
Terminals to be used: E, ES, S, H Terminals
Test Leads: connect to the E, ES, S, H Terminals (the alligator clip of ES Test Lead should be connected to the same
part of the alligator clip of earthed equipment under test where the E Test Lead is connected.)
Auxiliary Earth Spike: 2 pcs connect to S and H Terminals respectively
（
1
）
Press
key to select measurement method: 4-Pole (the Main Screen displays 4POLE in the upper part);
（
2
）
Press
Key to select measurement frequency(display in auxiliary display part );
（
3
）
Residual resistance of Rk
①
Firmly insert each plug of 4 test leads (black, green, red and blue) to the corresponding terminals E, ES, S
and H on the instrument respectively;
②
Engage 4 Alligator clips to short-circuit all of them;
③
Save the Rk values with reference to
“the residual resistance on the Test Leads”.
Note: the residual value is valid in earth resistivity measurement.
（
4
）
Connection of Auxiliary Earth Spikes and Test Leads(See figure 10)
Stick the Auxiliary Earth Spikes S and H into the ground deeply which should be aligned from the earthed equipment
under test. Connect the black Test Lead to the earthed equipment under test, the red Test Lead to the Auxiliary Earth
Spike S and the blue Test Lead to the Auxiliary Earth Spike H in sequence. Connect the green wire from ES terminal and
the black wire from E terminal to the same earthed equipment.
