Operation Manual

09/ 2013 BENNING CM 4
11

- 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 - rst index). No protec-
tion 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 4 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. Electrical specications
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 %.
7.1 Direct voltage ranges
The input resistance amounts to 1 MΩ
Measuring range Resolution Meas. precision Overload protection
400 V 0.1 V ± (0.7 % of the measuring value + 2 digits) 600 V
eff
600 V 1 V ± (0.7 % of the measuring value + 2 digits) 600 V
eff
7.2 Alternating voltage ranges
The input resistance amounts to 1 MΩ in parallel 100 pF.
Measuring
range
Resolution
Meas. precision *
1
within
the frequency range 50 Hz - 500 Hz
Overload
protection
400 V 0,1 V ± (1 % of the measuring value + 5 digits) 600 V
eff
600 V 1 V ± (1 % of the measuring value + 5 digits) 600 V
eff
*
1
The measured value is obtained by mean value rectification and displayed
as r.m.s. value. Its calibration is matched to a sinus-shaped curve type.
7.3 Alternating current ranges
Measuring
range
Resolution
Meas. precision *
1
within
the frequency range 50 Hz - 60 Hz
Overload
protection
60 A 0,1 A ± (1.9 % of the measuring value + 7 digits) 600 A
eff
400 A 0,1 A ± (1.9 % of the measuring value + 5 digits) 600 A
eff
600 A 1 A ± (1.9 % of the measuring value + 5 digits) 600 A
eff
within the frequency
range 61 Hz - 400 Hz
400 A 0,1 A ± (2.5 % of the measuring value + 7 digits) 600 A
eff
600 A 1 A ± (2.5 % of the measuring value + 7 digits) 600 A
eff
*
1
The measured value is obtained by mean value rectification and displayed
as r.m.s. value. Its calibration is matched to a sinus-shaped curve type.
The stated precision is specified for conductors that are centrally clamped
by the current probe  (see Fig. 4 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.
7.4 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.
7.5 Frequency ranges
Overload protection: 600 A
eff
Meas. range Resolution Meas. precision
400 Hz 1 Hz ± (0.1 % of the measuring value + 2 digits)
Minimum input frequency: 20 Hz