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Benning CM7 Manual

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09/ 2013
BENNING CM 7
13
200 - 400 A 0,1 A ± (1.9 % of the measuring value + 2 A) 1000 A
eff
within the frequency
range 50 Hz - 200 Hz
400 - 1000 A 1 A ± (2.9 % of the measuring value + 5 A) 1000 A
eff
*
1
The measuring value is gained and indicated as effective value (True RMS,
AC coupling). The measuring accuracy is specified for sinusoidal curves
and applies to the final value of the measuring range as well as for non-
sinusoidal curves up to 50 % of the final value of the measuring range.
In case of non-sinusoidal curves, the indicating value becomes inaccurate.
Thus, an additional error occurs for the following crest factors:
crest factor from 1.4 to 2.0 additional error + 1 %
crest factor from 2.0 to 2.5 additional error + 2.5 %
crest factor from 2.5 to 3.0 additional error + 4 %
*
2
additionally ± 4 digits for measuring values < 15 % of the final value of the
measuring range
The stated precision is specified for conductors that are centrally clamped by
the current probe (see Fig. 4 Direct/ alternating current measurement). For
conductors that are not centrally clamped, an additional error of 1 % of the
display value needs to be taken into account.
7.5 Resistance measuring range and acoustic continuity testing
Overload protection: 600 V
eff
Meas. range Resolution Meas. precision Max. idling voltage
400 Ω 0,1 Ω ± (1 % of the measuring value + 3 digits) 3 V
The built-in buzzer sounds in the case of a resistance R less than 30 Ω.
7.6 Frequency ranges
Overload protection: 1000 A
eff
Meas. range Resolution Meas. precision
400 Hz 1 Hz ± (1 % of the measuring value + 2 digits)
Minimum input frequency: 20 Hz
Minimum input sensitivity: 3 A
eff
7.7 PEAK HOLD
Measuring ranges: V AC, A AC
In the PEAK-HOLD function (storage of the peak value), an additional error has
to be considered for the specified accuracy:
+ (± 3 % + 20 digits)
Measuring values > 750 Vpeak or 800 Apeak are not specified.
The PEAK-HOLD function automatically selects the measuring range with the
lowest resolution.
7.8 MIN/MAX
In the MIN/MAX function (storage of the minimum/ maximum value), an addi-
tional error has to be considered for the specified accuracy:
+ (± 15 digits)
The MIN/MAX function automatically selects the measuring range with the
lowest resolution.
8. Making measurements with the BENNING CM 7
8.1 Preparations for making measurements
Operate and store the BENNING CM 7 only at the specified storage and
operating temperatures conditions. Avoid continuous insulation.
- Check rated voltage and rated current details specified on the safety meas-
uring lines. The nominal voltage and current ratings of the safety measuring
cables included in the scope of delivery correspond to the ratings of the
BENNING CM 7.
- Check the insulation of the safety measuring cables. Discard the safety
measuring cables immediately if the insulation is damaged.
- Check safety measuring lines for continuity. If the conductor in the safety
measuring line is interrupted, the safety measuring line must be quaran-
tined immediately.
- Before - at the rotary switch a different function is selected, the safety
measuring lines must be disconnected from the measuring point.
- Strong sources of interference in the vicinity of the BENNING CM 7 can
lead to unstable readings and measuring errors.
… 19 …


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