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C.A 6423 Earth Tester
3. OPERATING MODE
3.1 MEASUREMENT OF THE RESISTANCE OF AN EARTH POINT
To measure the resistance of an earth conductor, the so-called "62% method" is
in general recommended. This measurement requires the use of the items in the
Earth Kit (see Ch.6: TO ORDER).
Cut the power supply to the installation and disconnect it from the
earth by opening the earth bar!
1. Connect terminal E to the earth to be measured.
2. Check that the bar
❹
is not present between terminals S and H.
3. Drive in (completely if possible) the input earth rod H at a distance "a"
from the earth point (E) to be measured.
Note: this distance is further for a deep and extended earth point (larger
range of influence).
4. Drive in the rod S at 62% of the distance between the earth E and the
rod H (the rods S, H and the earth point must be in line).
5. Connect the rods to their respective terminals with the leads.
6. Press the "MEASURE" button
and hold the button during
measurement. Check that none of the three indicators are flashing,
otherwise, check the wiring (see Ch.3.4: FAULT SIGNALS) and make
the measurement again.
Measurement of resistance of earth point
