Current Measurement; Preparation For Measurement; Maintenance; Battery Replacement - Benning CM 2 Instrucciones De Servicio

8.5 Current measurement

8.5.1

Preparation for measurement

Store and use the BENNING CM 2 only under the correct temperature condi-
tions 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 leads 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:
9.

Maintenance


Before opening the BENNING CM 2, ensure that it is not
connected to a source of voltage! Electrical hazard!
Any work required on the BENNING CM 2 when it is under voltage must be
done only by a qualified electrician. Special steps must be taken to pre­
vent accidents.
Before opening the BENNING CM 2, remove it from all sources of voltage as
follows:
- Remove first the black and the red measuring tip from the measurement object.
- Then remove the black and red safety measuring leads from the BENNING CM 2.
- Move the sliding switch to the position "OFF".
9.1 Making the unit safe
Under certain circumstances, the safety of the BENNING CM 2 can no longer
be guaranteed. This may be the case if:
- there are visible signs of damage on the unit,
- errors occur in measurements,
- the unit has been stored for a long period of time under the wrong condi-
tions, and
- if the unit has been subjected to rough handling during transport.
In these cases, the BENNING CM 2 must be switched off immediately, removed
from the measuring points and secured to prevent it from being used again.
9.2 Cleaning
Clean the outside of the unit with a clean dry cloth. (Exception: any type of
special cleaning cloth). Never use solvents or abrasives to clean the clamp
meter. Ensure that the battery compartment and the battery contacts have not
been contaminated by electrolyte leakage. If any electrolyte or white deposits
are seen in the battery compartment or battery housing, remove these with a
dry cloth.

9.3 Battery replacement


Before opening the BENNING CM 2, ensure that it is not
connected to a source of voltage! Electrical hazard!
The BENNING CM 2 is powered by two 1.5 V batteries. The batteries must be
replaced (see fig. 8) when the battery symbol appears in the display .
To replace the batteries, proceed as follows:
- Remove the black and red measuring tips from the measurement circuit.
- Remove the black and red safety measuring leads from the BENNING CM 2.
- Lay the BENNING CM 2 on its front and unscrew the screw on the cover of
the battery compartment.
- Push the cover of the battery compartment to the side out of its guide.
- Remove the discharged batteries from the battery holder.
- Insert the new batteries into the battery holder. Make sure that they are
connected to the correct battery poles.
- Push the cover of the battery compartment into its correct position and
replace the screw.
See fig. 7:
05/ 2015
AC/ DC current measurement
Replacing the batteries.
BENNING CM 2

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