02/ 2011
BENNING CM 1-3
12
7. Electrical specifications
Note: The measuring accuracy is specified as the sum of:
- a relative part of the measured value and
- a number of digits (i.e. counting steps of the last digit).
This measuring accuracy applies to temperatures from 23 °C ± 5 °C and a rela-
tive air humidity lower than 80 %.
7.1 AC voltage ranges
The input resistance is 2 MΩ in parallel 100 pF. The measurement reading is
obtained by rectification of average reading and displayed as actual value.
Measuring range Resolution
Measurement accuracy
Overload protection
200 V
0.1 V
± (1.5 % of r 5 digits)
in frequency range 50 Hz - 500 Hz
750 V
eff
1000 DC voltage
750 V
1 V
± (1.5 % of r 5 digits)
in frequency range 50 Hz - 500 Hz
750 V
eff
1000 DC voltage
7.2 DC voltage ranges
The input resistance is 2 MΩ.
Measuring range Resolution
Measurement accuracy
Overload protection
200 V
0.1 V
± (1.0 % of r 2 digits)
750 V
eff
1000 DC voltage
1000 V
1 V
± (1.0 % of r 2 digits)
750 V
eff
1000 DC voltage
7.3 AC current ranges
(Current-fork opening embraces AC wire).
Measuring range Resolution
Measurement accuracy
Overload protection
200 A
0.1 A
± (3.0 % of the measured value + 3 digits)
within the frequency range 50 Hz – 60 Hz
400 A
Additional error in parallel current-conducting wire: < 0.08 A/ A.
7.4 Resistance measuring ranges
Overload protection for resistance measurements: 600 V
eff
Measuring
range
Resolution
Measuring accuracy
Max. open-circuit
voltage
200 Ω
0.1 Ω
± (1.0 % of the measured value+ 5 digits)
1.3 V
2 kΩ
1 Ω
± (1.0 % of the measured value + 2 digits)
1.3 V
20 kΩ
10 Ω
± (1.0 % of the measured value + 2 digits)
1.3 V
200 kΩ
100 Ω
± (1.0 % of the measured value + 2 digits)
1.3 V
2 MΩ
1 kΩ
± (1.0 % of the measured value + 2 digits)
1.3 V
20 MΩ
10 kΩ
± (1.9 % of the measured value + 5 digits)
1.3 V
7.5 Diode and continuity test
The stated measuring accuracy applies to a range between 0.4 V and 0.8 V.
Overload protection: 600 V
eff
The integrated buzzer sounds at a resistance R lower than 50 Ω.
Measuring
range
Resolution
Measuring accuracy
Max. measuring
current
Max.
open-circuit
voltage
1 mV
± (1.5 % of the measured value +
0.05 V)
1.5 mA
3.0 V
8. Measuring with the BENNING CM 1-3
8.1 Preparing the measurement
Operate and store the BENNING CM 1-3 at the specified storage and operating
temperatures only! Do not permanently expose the device to sunlight.
- Check stated nominal voltage and nominal current on the safety measuring
leads. Nominal voltage and current of the enclosed safety measuring leads
comply with the respective values of the BENNING CM 1-3.
- Check insulation of the safety measuring leads. If the insulation is
damaged, the safety measuring leads must be replaced immediately.
- Check the safety measuring leads for continuity. If the conductor in the
safety measuring lead is interrupted, replace the safety measuring leads
