INSTRUCTION FOR USE OF EARTH TESTER

Zero Adjustment

Before each measurement, check whether the pointer coincide with blank Zero (0) mark on the scale, when no current is flowing in the instrument. If necessary, set the pointer to zero by using Zero Adjuster screw.

All Products
Contact Us

Three Terminal Earth Tester for Earth Resistance Measurement

Connect all the three terminals as shown in fig. 1 Rotate the handle of generator with increasing speed until he pointer of the meter comes to rest to get the direct reading of Earth Resistance in ohms.

Note:

In case of multi range instrument, put the range selector switch at an appropriate position. Whenever in doubt connect from the higher range of the selector switch and work
downward.

Three Terminal Earth Tester for Earth Resistance Measurement

The Earth Tester is four Terminal Type. Terminal Marked viz.C1.P1.P2, C2. The instrument is suitable for Earth Resistance as well as EARTH RESISTIVITY (specific Soil Resistance).

Measurement of Earth Resistance:

BY means Four Terminal type Earth Tester ( use as Three Terminal Type) In Four Terminals type, short the terminals C1 & P1 and connect as per Fig.NO.2. Rotate the handle of generator until the pointer comes to rest. Read the earth resistance directly in ohms.

Measurement of Earth Resistivity

This is made usually by using Four Terminal EARTH TESTER. Connect the instrument terminals as per Fig.No.3, see that all Four Spikes are one straight line and the distance between all the spikes are kept same. The value of ‘L’ as in Fig.3, may be kept between 50 to 70 feet.

Rotate the generator handle speedily until the pointer comes to rest. Observer the reading of the instrument in ohms (taking care of the range factor). The value of Earth Resistivity o = 2πRL
where,
R = Value of Earth Resistance measured in ohms.
L = Distance between spikes in Cm.
π = 3.14

ρ = Earth’s Resistivity in ohms Cms,.

Non-Inductive or Non-capacitive

Connected the unknown resistance ‘X’ as per Fig. NO.4, And follow the instruction as mentioned for measurement of Earth Resistivity.

Accessories Required

Items For 4 T type For 3 T type
Spikes 4 Nos.. 2 Nos.
Hammer 1 No. 1 No.
Length of Cable(Leads) 4 Nos. 3 Nos.
Wrench 1 No. 1 No.
Screwdriver 1 No. 1 No.
Screenshot 2024-08-29 094222
Screenshot 2024-08-29 094255
Screenshot 2024-08-29 094242
Screenshot 2024-08-29 094307