Fault Signals - Chauvin Arnoux C.A 6423 Manual De Instrucciones

NB: In the case of low value resistances, it becomes necessary to take into account the
resistance of the leads (approx. 22.5 mΩ/m for those supplied as accessories). To overcome
the resistance of the leads, we advise the use of a (4 pole) Earth/Resistivity Tester, on 4-wire
connection.
Do not forget to reconnect the earth points after measurement.

3.3 FAULT SIGNALS

I Display of a negative measurement
Reversal of rods H and E or rods S and E
Re-connect the leads correctly
I Displayed measurement value is 1---
Overrange (R > 2000 Ω)
Check the connections
I Flashing of FAULT light
8
Fault in current circuit (E - H). Flashing indicates that the voltage between the terminals E and
H is greater than 30 V .
peak
This may mean that:
- the resistance of the current circuit between E and H is too high,
- the interference voltage in the circuit (E - H) is too high,
- the fuse is blown.
Check the rods, the leads, the connections and the fuse (see Ch.5.1.3).
I Flashing of HIGH RESISTANCE indicator
9
Fault in the voltage circuit (E - S). At the start of the measurement, the instrument
automatically checks the resistance between E and S. If this is greater than 50 kΩ, the
indicator begins to flash. This means that the measurement is likely to be very affected by
9
the resistance of the voltage circuit.
NB: The indicator flashes throughout the measurement, even if the resistance falls below
50 kΩ during it.
Check the rods, the leads and their connections.
I Flashing of HIGH NOISE indicator
10
Presence of interference voltages in the voltage circuit. Flashing indicates noise greater than
13 V between terminals E and S. These interference signals disturb the measurement.
peak
Move the rods.
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