Measuring With The Benning Cm - Benning CM 2 Operating Manual

7.4 Continuity test
No-load voltage approx. 3 V, max. test current 0.7 mA
The built-in buzzer sounds when resistance is less than 50 Ω - 300 Ω.
7.5 DC ranges
Measurement accuracy at a temperature of 23 °C ± 3 °C
Measuring range
40,0 A
40,0 - 200,0 A
200,0 - 300,0 A
7.6 AC ranges
Measurement accuracy at a temperature of 23 °C ± 3 °C. The measurement
reading is obtained by rectification of average reading and displayed as actual
value. 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%
Measuring range
0 - 4,0 A
4,00 - 40,00 A
40,0 - 200,0 A
200,0 - 300,0 A
7.7 Maximum HOLD
The measuring accuracy of the MAX-Hold display is the stated measuring
accuracy in % + 10 digits for the next measuring range. When passing to the
measuring range after next, the error increases to + 20 digits etc. (Example:
starting figure 100 mV - 120 V = + 30 digits). When measuring resistance, a
MAX hold indication is only possible in the range from 400  to 400 k.
8.

Measuring with the BENNING CM 2

8.1 Preparation for measurement
Store and use the BENNING CM 2 only under the correct temperature
conditions stated. Always avoid longer exposure to sunlight.
- Check the rated voltage and current stated on the safety measuring wires
with tips. The rated voltage and current of the safety measuring wires and
tips comply with the BENNING CM 2.
- Check the insulation of the measuring wires and tips. If the insulation is
damaged, replace the testing measuring wires immediately.
- Check the continuity of the safety measuring wires. If the wire is
disconnected at any point, remove it immediately.
- Before selecting another function with the sliding switch  or the function
button , the safety measuring wires and tips must be disconnected from
the measuring point.
- Strong sources of interference close to the BENNING CM 2 may produce
unstable readings and measurement errors.
02/ 2006
Resolution Measurement accuracy
10 mA ± (1,0 % of reading + 2 digit)
100 mA ± (1,0 % of reading + 2 digit)
100 mA ± (2,0 % of reading + 2 digit)
Resolution Measurement accuracy
± (1,0 % of reading + 5 digit)
for frequencies 50 - 60 Hz
10 mA
± (2,0 % of reading + 7 digit)
for frequencies 40 - 1 Hz
± (1,0 % of reading + 3 digit)
for frequencies 50 Hz - 60 Hz
10 mA
± (1,5 % of reading + 5 digit
for frequencies 40 Hz - 1 kHz
± (1,0 % of reading + 3 digit)
for frequencies 50 Hz - 60 Hz
100 mA
± (1,5 % of reading + 5 digit)
for frequencies 40 Hz - 1 kHz
± (3,0 % of reading + 3 digit)
for frequencies 50 Hz - 60 Hz
100 mA
± (5,0 % of reading + 5 digit)
for frequencies 40 Hz - 1 kHz
BENNING CM 2

Overload protection
400 A
400 A
400 A
Overload protection
400 A
400 A
400 A
400 A
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