Measurement Of Resistance - Chauvin Arnoux C.A 6423 Manual De Instrucciones

Checking the measurement
7. Note the displayed value.
8. Wait for a few moments and then re-measure.
9. Move rod S by 10% towards H, along the line between the earth point E and the rod H.
Measure and note the result.
10. From its initial position, move rod S by 10% towards E, along the line between the earth
point E and the rod H.
If the three values are of the same order of magnitude, the earth measurement is correct. If
not, increase the distance "a" and repeat the measurements.
Do not forget to reconnect the earth point after the measurement.

3.2 MEASUREMENT OF RESISTANCE

This measurement can be performed to determine the coupling resistance between two earth
points. For example, between the neutral and ground earth points (EDF distribution).
Cut the power supply of the installations. For measurement of the coupling
resistance, disconnect the earths!
1. Short-circuit terminals S and H using the bar provided
2. Connect terminal E to the earth of the ground, and terminal H to the earth of the neutral.
3. Press the "MEASURE" button
Check that none of the three indicators are flashing, otherwise check the connections (see
Ch.3.4: FAULT SIGNALS) and repeat the measurements.
2-wire resistance measurement
earth
bar
earth 1
and hold down until the measurement is displayed.
11
E S H
18
.
4
earth
bar
earth 2