Voltage Measurement; Resistance Measurement; Current Measurement - PEWA BENNING CM 2 Instrucciones De Servicio

8.2 Voltage measurement


Always observe the maximum voltage to earth potential!
Electrical hazard!
The maximum voltage which may be applied to the sockets of the BENNING CM 2
- COM socket, black ,
- V- socket (positive)  for voltage and resistance measurements and
continuity testing (marked red) against earth potential, is 600 V.
- Select the desired function with the sliding switch  and the function button
 of the BENNING CM 2.
- Contact the black safety measuring wire with the COM-socket  (black).
- Contact the red safety measuring wire with the V- socket  (red).
- Bring the black and red measuring tips into contact with the measurement
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 2 is fully functional by short-circuiting the measuring
tips.
See fig. 2:
See fig. 3:

8.3 Resistance measurement

- Select the desired function with the sliding switch  and the function button
 of the BENNING CM 2.
- Contact the black safety measuring wire with the COM-socket  (black).
- Contact the red safety measuring wire with the V- socket  (red).
- Bring the black and red measuring tips into contact with the measurement
points. 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
- Select the area marked with the buzzer symbol with the sliding switch 
and the function button  of the BENNING CM 2.
- Contact the black safety measuring wire with the COM-socket  (black).
- Contact the red safety measuring wire with the V- socket  (red).
- Bring the black and red measuring tips into contact with the measurement
points. If the resistance between the measurement points is less than 50 ,
the buzzer incorporated in the BENNING CM 2 sounds.
See fig. 5:

8.5 Current measurement

8.5.1 Preparation for measurement
Store and use the BENNING CM 2 only under the correct temperature
conditions stated. Always avoid long exposure to sunlight.
- Strong sources of interference close to the BENNING CM 2 may produce
unstable readings and measurement errors.
Do not apply voltage to the output contacts of the BENNING CM 2.

If necessary, remove the safety measuring wires connected.
When measuring DC current, observe correct polarity.
8.5.2 Current measurement
- Select the desired measuring function with the sliding switch  and the
function button .
- Press the "ZERO" button to set the BENNING CM 2 to the starting point.
- Operate the opening lever . Grip the single wire containing the current to
be measured with the prongs of the BENNING CM 2.
- Read the value in the digital display .
See fig. 6:
02/ 2006
DC-voltage measurement
AC-voltage measurement
Resistance measurement
Continuity testing with buzzer
AC/ DC current measurement
BENNING CM 2
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