02/ 2006
BENNING CM 1
10
7.5 AC range
(Current-fork opening embraces AC wire).
Measuring range Resolution
Measurement accuracy
Overload protection
200 A
0,1 A
± (3,0 % of r 3 digit)
in frequency range 45 Hz - 66 Hz
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:
DC-voltage measurement
See fig. 3:
AC-voltage measurement
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:
Resistance measurement
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:
Continuity test with buzzer.