Measuring With The Benning Cm - Benning CM 1 Operating Manual

7.5 AC range
(Current-fork opening embraces AC wire).
Measuring range
200 A
Additional error in parallel current-conducting wire: < 0.05 A/ A.
8.

Measuring with the BENNING CM 1

8.1 Preparation for measurement
Store and use the BENNING CM 1 only under the correct temperature
conditions stated. Always avoid permanent exposure to sunlight.
- The black and red safety measuring wires and tips only comply with
regulations when they are undamaged.
- Check the insulation of the measuring wires and tips. If the insulation is
damaged, replace the testing unit immediately.
- Check the continuity of the safety measuring wires. If the wire is
disconnected at any point, replace the testing unit immediately.
- Before selecting another function with the rotating switch , the safety
measuring wires and tips must be disconnected from the parts being
measured.
- Strong sources of interference close to the BENNING CM 1 may produce
unstable readings and measurement errors.
8.2 Voltage measurement
Always observe the maximum voltage to earth potential!

Electrical hazard!
The maximum voltage which may be applied to the wires
- COM safety wire, black ,
- V- safety wire, red (positive)  against earth potential for voltage and
resistance measurements and continuity testing is 600 V.
- Select the desired range with the rotating switch .
- Bring the measuring tips into contact with the measuring points. Read the
measurement value on the digital display .
Note:
In small voltage measuring ranges, the zero-volt indication does not appear
(due to interference) when the safety measuring wires are open. Make sure
that the BENNING CM 1 is fully functional by short-circuiting the measuring
tips.
See fig. 2:
See fig. 3:
8.3 Resistance measurement
- Select the desired range with the rotating switch .
- Bring the measuring tips into contact with the measuring point. Read the
measurement value on the digital display .
Note:
- To obtain a correct measurement, ensure that no voltage is applied to the
measuring point.
- With small resistances, the measuring result can be improved by measuring
the resistance of the safety measuring wires beforehand by short-circuiting
the measuring tips and subtracting the reading obtained from the resistance
measured.
See fig. 4:
8.4 Continuity testing with buzzer
- Turn the rotating switch  to the area marked with the buzzer symbol.
- Bring the measuring tips into contact with the measuring point. Read the
measurement value on the digital display .
If the resistance between the measuring points is less than 25 Ω, the buzzer
integrated in the BENNING CM 1 is heard.
See fig. 5:
02/ 2006
Resolution Measurement accuracy
± (3,0 % of reading + 3 digit)
0,1 A
in frequency range 45 Hz - 66 Hz
DC-voltage measurement
AC-voltage measurement
Resistance measurement
Continuity test with buzzer.
BENNING CM 1

Overload protection
200 A
10