Chauvin Arnoux C.A 6456 Notice De Fonctionnement page 75

4.4.3 MEASUREMENT PROCEDURE
In the case of 2-wire loop measurements, there is no monitoring of the potential of
terminal PE nor the installation PE line.
Loop measurements with 2 wires are identical to loop measurements with 3 wires except as follows :
- the voltage between the TEST key and PE is not measured: only the potential between terminals L and
N is measured;
- there is no monitoring of U
NPE
The instrument measures voltage U
Nota : pour les mesures dans les systèmes triphasés, cette impédance doit être mesurée entre chaque
conducteur de phase et le conducteur du neutre.
4.4.4 MEASUREMENT RESULTS
After the measurement, the measured values and complementary results can be consulted using
the and keys.
MORE
(The quantities accessible before the measurement is made are described above, in § 4.1.4.)
Initial
display
R
LN
Initial display
Z
LN
R
st
(1 press)
LN
Z
LN
R
(2 nd press)
LN
Z
LN
4.4.5 CHARACTERISTICS
4.4.5.1 Measurement ranges and accuracy
The particular reference conditions are the same as for 3-wire loop measurements (see § 4.3.5).
The characteristics are the same as for earth measurements in a live condition: see § 4.2.5.1.
4.4.5.2 Influencing quantites
Same as for earth measurements in a live condition: see § 4.2.5.2.
4.4.6 WARNINGS OR ERROR REPORTS
Same as for earth measurements in a live condition (see § 4.2.6) except as follows:
- the rod and the current probe are not taken into account,
- error management on U only,
LN
- measurement between the TEST key and PE not taken into account.
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hich enable the measurement..
and voltages U , U if terminal PE is connected.
LN LPE NPE
MORE MORE MORE
st (2 nd press)
(1 press) (3 nd
U
L
REF
LN
I
Z
KLN
LN
U
L
REF
LN
I
U
Z
KLN
LN
U
L
REF
LN
I
U
Z
KLN
LN
74
MORE MORE
press)
(4 nd press) (5 nd press)
Hz ---- R
∆ ∆ ∆ ∆ ∆
U
Z U
LN L ALARM L
Hz
---- R
∆ ∆ ∆ ∆ ∆
Z U
LPE L ALARM L
Hz
---- R
∆ ∆ ∆ ∆ ∆
Z U
NPE
L ALARM L