11/ 2008
BENNING MM 7
14
6. Ambient conditions
- The BENNING MM 7 is designed only for measuring in dry surroundings,
- Maximum barometric height during measurement: 2000 m.
- Overvoltage category / set-up category: IEC 664/ IEC 1010-1 → 600 V cate-
gory III; 1000 V category II.
- Degree of contamination: 2.
- Protective system: 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:
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 %.
- Storage temperature: The BENNING MM 7 can be stored at temperatures
from - 20 °C to + 60 °C (humidity 0 up to 80 %). 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 18 °C to 28 °C and a
maximum relative humidity of max. 80 %.
7.1 DC voltage ranges
The input resistance is 10 MΩ (in 400 mV-range 1 GΩ).
Measuring range Resolution Measurement accuracy Overload protection
400 mV 100 µV ± (0.25 % of reading + 5 digits) 1000 V
DC
4 V 1 mV ± (0.4 % of reading + 1 digit) 1000 V
DC
40 V 10 mV ± (0.25 % of reading + 1 digit) 1000 V
DC
400 V 100 mV ± (0.25 % of reading + 1 digit) 1000 V
DC
1000 V 1 V ± (0.25 % of reading + 1 digit) 1000 V
DC
7.2 AC voltage ranges
The input resistance is 10 MΩ parallel 100 pF. The measurement value is
obtained as a true RMS value and displayed as such. With non-sinusoidal
curves, the value displayed is less accurate. This results in an additional error
for the following crest factors:
Crest factor of 1.4 to 3.0, additional error + 1.5 %.
Crest factor of 3.0 to 4.0, additional error + 3.0 %.
Measuring
range
Resolution
Measurement accuracy
in frequency range 40 Hz - 1000 Hz
Overload
protection
400 mV 100 µV
± (2.0 % of reading + 8 digits)
in frequency range 50 Hz - 60 Hz
750 V
eff
4 V 1 mV ± (1.3 % of reading + 5 digits)
*1*2
750 V
eff
40 V 10 mV ± (1.3 % of reading + 5 digits)
*2
750 V
eff
400 V 100 mV ± (1.3 % of reading + 5 digits)
*2
750 V
eff
750 V 1 V ± (1.3 % of reading + 5 digits)
*2
750 V
eff
*
1
± (1.5 % + 5 Digit) in frequency range 500 Hz - 1 kHz
*
2
± (1.5 % + 5 Digit) for measuring ranges > 50 % of the measuring range value
7.3 DC ranges
Overload protection:
- 1 A (500 V) fuse, rapid on mA input
- 10 A (500 V) fuse, rapid on 10 A input
Measuring range Resolution Measurement accuracy Voltage drop
40 mA 10 µA ± (0.6 % of reading + 2 digits) 200 mV max.
400 mA 100 µA ± (0.7 % of reading + 2 digis) 2 V max.
10 A 10 mA ± (1.0 % of reading + 3 digits) 2 V max.
7.4 AC ranges
The measurement reading is obtained as a true RMS reading and displayed
as such. With non-sinusoidal curves, the value displayed is less accurate. This
results in an additional error for the following crest factors:
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