Measuring With The Benning Cm; Voltage Measurement; Resistance Measurement - Benning CM 2 Instrucciones De Servicio

7.7 Maximum HOLD
The measuring accuracy of the MAX-Hold display is the stated measuring accu-
racy in % + 10 digits for the next measuring range. When passing to the measur-
ing 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 measuring
Store and use the BENNING CM 2 only under the correct temperature condi-
tions stated. Always avoid longer exposure to sunlight.
- Check the rated voltage and current stated on the safety measuring leads
with tips. The rated voltage and current of the safety measuring leads and
tips comply with the BENNING CM 2.
- Check the insulation of the measuring leads and tips. If the insulation is
damaged, replace the safety measuring leads immediately.
- Check the continuity of the safety measuring leads. If the leads is discon-
nected at any point, remove it immediately.
- Before selecting another function with the sliding switch  or the function
button , the safety measuring leads 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.

8.2 Voltage measurement


Always observe the maximum voltage to earth potential!
Electrical hazard!
The maximum voltage which may be applied to the sockets
- COM socket, black ,
- V- socket (positive)  for voltage and resistance measurements and
continuity testing (marked red)
of the BENNING CM 2 against ground, amounts to 600 V.
- Select the desired function with the sliding switch  and the function button
 of the BENNING CM 2.
- Contact the black safety measuring lead with the COM-socket  (black).
- Contact the red safety measuring lead with the V- socket  (red).
- Bring the black and red measuring tips into contact with the measurement
points. Read the measured 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 leads 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 lead with the COM-socket  (black).
- Contact the red safety measuring lead with the V- socket  (red).
- Bring the black and red measuring tips into contact with the measurement
points. Read the measured 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 leads 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 lead with the COM-socket  (black).
- Contact the red safety measuring lead 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:
05/ 2015
DC-voltage measurement
AC-voltage measurement
Resistance measurement
Continuity testing with buzzer
BENNING CM 2

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