Measurement Of Earth Resistivity - Chauvin Arnoux C.A 6460 Notice De Fonctionnement

4. Connect the rods to their respective terminals on the
instrument, using the leads.

5. Press the
button until the measurement is displayed.
Make sure that none of the three indicators is flashing,
otherwise check the setup (see § 3.5 Fault signalling)
and start measuring again.
Checking the measurement:
6. Note the measurement value previously obtained.
7. Redo a measurement a few moments later.
8. Move rod S toward H over a distance of 10% of "a".
Measure and note the result.
9. From the initial position, move the rod S toward E over a
distance of 10% of "a". Measure and note the result.
If the three measurements are of the same magnitude, the
measurement is correct. Otherwise, increase "a" and start
the entire operation again.
Note: To counter the resistance of the lead E (approximately
22.5 mΩ / m for the lead supplied in the kit), it is better to
disconnect the terminal bar and connect the ES terminal to
the earth to be measured.
Remember to reconnect the earth terminal strip once you
have finished measuring !
3.3

Measurement of earth resistivity

This measurement is used for choosing, when possible, the
best location and shape of the earth point before it is built.
This measurement is made using the WENNER method
described below It requires the use of the components of the
resistivity kit (see para. 7 o order).
rod E rod ES
1. Check that the terminal bar is disconnected between the
terminals E and ES.
2. Set out the four rods in a straight line at a constant interval "a",
rod S rod H
24