Benning CM 7 Bedienungsanleitung Seite 14

6.­ Environment­conditions:
- The BENNING CM 7 is intended for making measurements in dry
environment.
- Maximum barometric elevation for making measurements: 2000 m,
- Overvoltage category/ Siting category:
IEC 60664-1/ IEC 61010-1 → 600 V category IV, 1000 V category III
- Contamination class: 2,
- Protection Class: IP 30 (DIN VDE 0470-1 IEC/ EN 60529)
IP 30 means: Protection against access to dangerous parts and protection
against solid impurities of a diameter > 2.5 mm, (3 - first index). No
protection against water, (0 - second index).
- Operating temperature and relative humidity:
For operating temperature from 0 °C to 30 °C: relative humidity less than 80 %
For operating temperatures from 31 °C to 40 °C: relative humidity less than 75 %
For operating temperature from 41 °C to 50 °C: relative humidity less than 45 %
- Storage temperature: The BENNING CM 7 can be stored at any temperature
in the range from - 20 °C to + 60 °C (relative humidity from 0 to 80 %). The
battery should be taken out of the instrument for storage.
7. E lectrical specifications
Note: The measuring precision is specified as the sum of
- a relative fraction of the measured value and
- a number of digits (counting steps of the least significant digit).
This specified measuring precision is valid for temperatures in the range from
18 °C to 28 °C and relative humidity less than 80 %.
7.­ Direct­voltage­ranges
The input resistance amounts to 1 M
Meas. range Resolution
400 V 0,1 V
1000 V
7.2­ Alternating­voltage­ranges
The input resistance amounts to 1 M in parallel 100 pF.
Measuring
Resolution
range
400 V
750 V
* The measuring value is gained and indicated as effective value (True RMS,
1
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 %
* additionally ± 4 digits for measuring values < 15 % of the final value of the
2
measuring range
7.3­ Direct­current­(DC)­ranges
Meas. range Resolution
0 - 200 A
200 - 400 A
400 - 1000 A
The indicated accuracy is specified for conductors which are gripped by
means of the measuring clamp  in the middle (see Fig. 4 Direct/ alternating
current measurement). For conductors which are not gripped in the middle, an
additional error of 1 % of the indicating value has to be considered.
Error according to remanence: 1 % (repeating measurement)
11/ 2006
± (0.7 % of the measuring value + 2 digits)
1 V ± (0.7 % of the measuring value + 2 digits)
Meas. precision *
frequency range 50 Hz - 500 Hz
0,1 V ± (1 % of the measuring value + 5 digits)
1 V ± (1 % of the measuring value + 5 digits)
0,1 A ± (2,9 % of the measuring value + 3 A)
0,1 A ± (1,9 % of the measuring value + 2 A)
1 A ± (2,9 % of the measuring value + 5 A)
B ENNING CM 7
Meas. precision
* within the
1 2
Measuring accuracy

Overload protection
750 V
eff
750 V
eff
Overload
protection
750 V
eff
750 V
eff
Overload protection
1000 A
eff
1000 A
eff
1000 A
eff
2