Chauvin Arnoux C.A 6456 Bedienungsanleitung Seite 63

4.2.5.2 Measurement ranges and accuracy
Limits of the domain
Influencing quantities
Temperature
Relative humidity 10 to 85% RH at 45° C
Power supply voltage
Voltage in series in the
voltage measurement
loop (S-E)
Voltage in series in the
current injection loop
(H-E)
Current loop rod
resistance (R )
H
Voltage loop rod
resistance (R )
S
4.2.6 WARNINGS OR ERROR REPORTS (2P OR 3P EARTH MEASUREMENTS)
Preliminary remark : he complete list of coded errors is given in § 7
Display - Indication
Hz (ou)
U OU U > 30V
HE SE
Er22
COMP
Press the TEST key to exit from the error conditions.
If the value of R is negative, it means that:
E
- the rod resistances are too high,
- or the spurious voltages are too high,
- or the compensation of the cables is wrong. It must be done over with the cables actually used
(see § 3.3).
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of use
Typical
1%/10 ° C ± 1pt
-10 to + 55 ° C
1% / V ± 1pt
6.8 to 10 V
0 to 30 V
Except at 128 ± 16Hz
from 15.3 to 450Hz
0 to 30 V
Except at 128 Hz
from 15.3 to 450Hz
0.5%/10kΩ
0 to 50kΩ
+ 0,015% R
0.5%/10kΩ
0 to 50kΩ
+ 0,015% R
Remark - Possible cause
U ou U is > 30V : the measurement is affected.
HE SE
Try to move rods H and S
- resistance on rods H or S too high,
- or earth resistance too high,
- or spurious voltages too high.
Check the connections and the auxiliary rods.
62
Variation of the measurement
Maximum
2%/10 ° C + 2pt
2% 3% + 2 p t
2%/ V + 2pt
0.2%/V + 1 pt
0.2%/V + 1 pt
1%/10kΩ
+ 0,015% R
H
1%/10kΩ
+ 0,015% R
S
H
S