Benning CM 1 Instrucciones De Servicio página 13

8.5 AC-current measurement
8.5.1 Preparation for measurement
Store and use the BENNING CM 1 only under the correct temperature
conditions stated. Always avoid long exposure to sunlight.
- Strong sources of interference close to the BENNING CM 1 may produce
unstable readings and measurement errors.
Do not apply voltage to the measuring wires of the testing unit.
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When not in use, clip the wires onto the underside of the unit.
8.5.2 Current measurement
- Turn the rotating switch  to the area marked with the symbol A.
- Push the fork over the conductor wire. The conductor wire must be in the
extended open area.
- Read the value shown in the display .
See fig. 6:
9. Maintenance
Before opening the BENNING CM 1, ensure that it is not
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connected to a source of voltage! Electrical hazard!
Any work required on the BENNING CM 1 when it is under voltage must
be done only by a qualified electrician. Special steps must be taken to
prevent accidents.
To ensure that the no voltage is applied to the BENNING CM 1 before opening
it, proceed as follows:
- Remove the measurement tips from the object being measured
- Turn the rotating switch  to the "Off" position.
9.1 Making the unit safe
Under certain circumstances, the safety of the BENNING CM 1 can no longer
be guaranteed. This may be the case if:
- there are visible signs of damage on the unit or safety measuring wires,
- errors occur in measurements,
- the unit has been stored for a long period of time under the wrong
conditions, and
- if the unit has been subjected to rough handling during transport.
In these cases, the BENNING CM 1 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 testing
unit. 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 1, ensure that it is not

connected to a source of voltage! Electrical hazard!
The BENNING CM 1 is powered by a 9 V battery. The battery must be replaced
(see fig. 7) when the battery symbol appears in the display .
To replace the battery, proceed as follows:
- Remove the BENNING CM 1 from the measuring circuit.
- Lay the BENNING CM 1 on its front and unscrew the two screws on the
cover of the battery compartment.
- Remove the cover of the battery compartment.
- Remove the discharged battery from the battery compartment and
disconnect the wires carefully.
- Connect the new battery to the correct battery poles. When re-inserting the
battery, ensure that the wires are not crushed between different parts of the
housing. Place the battery in the correct part of the battery compartment.
02/ 2006
AC current measurement
BENNING CM 1
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