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

English
N.B. : In the case of low value resistances, it becomes necessary to take into
account the resistance of the leads (approx. 22.5 m /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

Display of a negative measurement.
Reversal of rods H and E or rods S and E.
Re-connect the leads correctly.
Displayed measurement value is 1---.
Overrange (R > 2000 )
Check the connections.
Flashing of FAULT light
Fault in current circuit (E - H). Flashing indicates that the voltage between the
terminals E and H is greater than 30 V
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).
Flashing of HIGH RESISTANCE indicator
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 50k ,
❾
the indicator begins to flash. This means that the measurement is likely to be
very affected by the resistance of the voltage circuit.
NB: The indicator flashes throughout the measurement, even if the resistance
falls below 50k during it.
Check the rods, the leads and their connections.
Flashing of HIGH NOISE indicator
Presence of interference voltages in the voltage circuit. Flashing indicates noise
greater than 13V
peak
disturb the measurement.
Move the rods.
22
❽
.
peak
❿
between terminals E and S. These interference signals
.
❾
C.A 6423 Earth Tester