Benning CM 8 Operating Manual page 24

- a number of digits (i.e. counting steps of the last digit).
This measuring accuracy applies to temperatures from 18 °C to 28 °C and a
relative air humidity lower than 80 %.
7.1 DC voltage ranges
The input resistance is 3 MΩ.
Measuring
Resolution
range
60 V
600 V
7.2 AC voltage ranges
The input resistance is 3 MΩ in parallel 100 pF.
Measuring
Resolution
range
60 V
600 V
*1
The measured value is obtained and displayed as real r.m.s. value (True
RMC, AC coupling). The measuring accuracy is specified for a sinusoidal
curve.
In case of non-sinusoidal curves, the accuracy of the displayed value de-
creases. There is no additional error if the crest factor is within following
specification (AC V, 45 Hz - 65 Hz):
Range:
0 ~ 250 V
250 V ~ 600 V
Peak Hold: Peak Max/ Peak Min (AC V)
Measuring range
85.0 V... 850 V
7.3 DC current ranges
Measuring
Resolution
range
600 A 0.1 A
The specified accuracy for conductors that are centrally clamped by means of
the current clamp M (see figure 4 DC/ AC current measurement). For conduc-
tors that are not centrally clamped, an additional error of 1 % of the displayed
value has to be considered.
Maximum remanence error: 1 % (in case of repeated measuring)
Condition: Null balance before measuring!
7.4 AC current ranges
Measuring
Resolution
range
600 A
600 A
*1
The measured value is obtained and displayed as real r.m.s. value (True
RMC, AC coupling). The measuring accuracy is specified for a sinusoidal
curve.
In case of non-sinusoidal curves, the accuracy of the displayed value de-
creases. Thus, an additional error results for
Crest factor from 1.4 to 2.0 additional error + 1 %
Crest factor from 2.0 to 3.0 additional error + 2.0 %
within following specification: (AC A, 45 Hz - 65 Hz)
Range:
0 ~ 250 A
250 A ~ 600 A
The specified accuracy for conductors that are centrally clamped by means of
the current clamp M (see figure 4 DC/ AC current measurement). For conduc-
tors that are not centrally clamped, an additional error of 1 % of the displayed
value has to be considered.
02/ 2019
0.01 V ± (0.7 % of the measured value + 5 digits)
0.1 V ± (0.7 % of the measured value + 5 digits)
Measuring accuracy *
frequency range 45 Hz – 500 Hz
0.01 V ± (1 % of the measured value + 5 digits)
0.1 V ± (1 % of the measured value + 5 digits)
Crest factor:
up to 3
from 3 (250 V) linear decreasing to 1.42 (600 V
± (1.5 % of the measured value + 5 digits)
Measuring accuracy
frequency range 45 Hz – 65 Hz
0.1 A ± (1.5 % of the measured value + 5 digits)
within the frequency range
0.1 A ± (2.5 % of the measured value + 5 digits)
Crest factor:
up to 3
from 3 (250 A) linear decreasing to 1.42 (600 A)
BENNING CM 8
Measuring
accuracy
1
within the
Measuring accuracy
± (3 % of the measured value +15 digits)
Measuring accuracy
*1
within the
66 Hz - 400 Hz

Overload
protection
600 V
eff
600 V
eff
Overload
protection
600 V
eff
600 V
eff
)
eff
Overload
protection
600 A
eff
Overload
protection
600 A
eff
600 A
eff
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