Chauvin Arnoux C.A 6456 Notice De Fonctionnement page 68

4.3.5 CHARACTERISTICS
4.2.5.1 Measuremetn ranges and accuracy
conditions :
Characteristics of the measurements:
Characteristics in "high current" mode ("tripping" mode
Charge duration : 300µs cycle
Display range
Specified
0.20 - 1.99 Ω
measurement
domain
Peak measuring
1.06 to 3.25 Ω 0.90 to 3.25 A
current between
90V and 280V
Peak measuring
1.27 to 2.73 A
current between
280V and 550V
Accuracy of the
impedance
measurement
Additional error
for Rearth
Max. inductance acceptable for the measurement : 20mH (display range 400.0mH)
Characteristics in "low current" mode ("non-tripping" mode
Charge duration : cycle of one network frequency period.
Display range
Specified
measurement 0,5 - 1,9Ω
domain
RMS measuring
6 - 9 - 12 mA (adjustable in «SET-UP» mode : see & 3.2)
current
Accuracy of the
± 15% ± 10 pt
resistance
(2)
measurement
(2)
No measurement of the inductive part in"low current" mode.
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nominal voltage of the installation = 90 to 550 V,
nominal frequency of use = 15.3 to 65 Hz,
resistance in series with voltage probe: < 100Ω
inductive part < 0.1 x the resistive part of the impedance measured,
resistance of the cable connected to terminal PE corrected,
contact voltage < 5V (potential of terminal PE with respect to the
local earth).
40 Ω
2.00 - 19.99 Ω 20.00 - 39.99 Ω 40.0 - 399.9 Ω
0.79 to 2.83 A
1.20 to 2.71 A 1.13 to 2.57 A
± 10% ±15 pt ± 5% ±15 pt
± 0,3 Ω
400Ω
2,0 - 19,9Ω 20,0 - 399,9Ω
67
):
400 Ω 4000 Ω
400 - 3999 Ω
0.24 to 2.47 A 0.03 to 0.76 A
0.55 to 2.42 A 0.08 to 1.18 A
± 5% ±5 pt ± 5% ±2 pt
):
4000Ω
400 - 3999Ω
± 15% ± 5 pt