User Manual

02/ 2018 BENNING CM 2
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0.2 x (stated measurement accuracy) °C < 20 °C or > 26 °C with refer-
ence to the value at the reference temperature of 23 °C.
5.1.8 The BENNING CM 2 is supplied by 2 1.5 V batteries (IEC LR03/ ”Micro”).
5.1.9 When the battery voltage drops under the intended operating voltage of
the BENNING CM 2, a battery symbol appears in the display.
5.1.10 The service life of the battery is approx. 60 hours (alkali battery).
5.1.11 Dimensions of unit (length x width x height) = 192 x 66 x 27 mm.
Weight of unit: 205 g
5.1.12 The safety measuring leads and measurement tips supplied are spe-
cially suited to the rated voltage of the BENNING CM 2. The measuring
tips can be protected by caps.
5.1.13 Widest prong opening: 25 mm
5.1.14 Largest wire diameter: 22 mm
6. Ambient conditions
- The BENNING CM 2 is designed only for measuring in dry surroundings.
- Maximum barometric height during measurement: 2000 m
- Overvoltage category / set-up category: IEC 60664-1/ IEC 61010-1 → 300 V
category III, 600 V category II,
- Degree of contamination: 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 protec-
tion against water, (0 - second index).
- Operating temperature and relative humidity for voltage and resistance
measurements:
At operating temperature of 0 °C to 30 °C: relative humidity under 80%
At operating temperature of 30 °C to 40 °C: relative humidity under 75%
At operating temperature of 40 °C to 50 °C: relative humidity under 45%
- Operating temperature and relative humidity for current measurements:
At operating temperature of 0 °C to 30 °C: relative humidity under 80%
At operating temperature of 30 °C to 40 °C: relative humidity under 75%
- The BENNING CM 2 can be stored at temperatures from - 20 °C to + 60 °C.
The batteries must be removed from the unit.
7. Electrical data
Note: The measurement accuracy is stated as the sum of
- a relative proportion of the measurement value and
- a number of digits (i.e. numerical steps of the last place).
This measurement accuracy applies for a temperature of 23 °C ± 5 °C (23 °C ± 3 °C
for current measurement) and a maximum relative humidity of 80%.
The BENNING CM 2 has an automatic switch-over of measurement range.
Previous setting is therefore not required.
7.1 DC voltage range
The input resistance is ≥ 10 M.
Measuring range Resolution Measurement accuracy Overload protection
400,0 mV 100 µV ± (0,5 % of reading + 5 digits)
600 V
eff
600 V DC voltage
4,000 V 1 mV ± (0,5 % of reading + 2 digits)
600 V
eff
600 V DC voltage
40,00 V 10 mV ± (0,5 % of reading + 2 digits)
600 V
eff
600 V DC voltage
400,0 V 100 mV ± (0,5 % of reading + 2 digits)
600 V
eff
600 V DC voltage
600 V 1 V ± (0,5 % of reading + 2 digits)
600 V
eff
600 V DC voltage
7.2 AC voltage range
The input resistance is ≥ 10 MΩ parallel 100 pF. The measuring value is gained
and indicated as effective value (True RMS, AC coupling). Its calibration is
adapted for a sinusoidal curve form. With deviations from this form, the display
value becomes less accurate. The additional error for the following crest factors
is as follows:
crest factor of 1.4 to 2.0: additional error ± 1.0%
crest factor of 2.0 to 2.5: additional error ± 2.5%
crest factor of 2.5 to 3.0: additional error ± 4.0%