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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 MM 7 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 near to the battery or in the battery
compartment, remove them with a dry cloth, too.
9.3 Batteryreplacement
Before opening the BENNINGMM7, ensure that it is not
connectedtoa s ourceofvoltage!Electricalhazard!
The BENNING MM 7 is powered by 9-V block battery. The battery must be
replaced (see fig. 12) when the battery symbol appears in the display .
To replace the battery, proceed as follows:
-
First remove the safety test leads from the measurement circuit.
-
Remove the safety test leads from the BENNING MM 7.
-
Turn the rotating switch to "OFF".
-
Remove the protective rubber holster from the BENNING MM 7.
-
Lay the BENNING MM 7 on its front and loosen the screw from the cover of
the battery compartment.
-
Lift the battery compartment cover (at the recesses in the housing) off the
bottom part.
-
Lift the discharged battery out of the battery compartment and remove the
battery leads carefully from the battery.
-
Connect the new battery with the battery leads and arrange them in such a
way that they are not crushed between the two halves of the housing. Then
place the battery in the correct position in the battery compartment.
-
Clip the battery cover onto the bottom part and tighten the screw.
-
Replace the BENNING MM 7 in its protective rubber holster .
See fig. 12:
Remembertheenvironment!Donotdisposeofusedbatteries
with domestic waste. Dispose of them at a battery-collection
point or as toxic waste. Your local authority will give you the
informationyouneed.
9.4 Fusereplacement
Before opening the BENNINGMM7, ensure that it is not
connectedtoa s ourceofvoltage!Electricalhazard!
The BENNING MM 7 is protected from overloading by two integrated melt fuses
(1 A and 10 A rapid acting) (see fig. 13)
To replace the fuses, proceed as follows:
-
Disconnect the safety test leads from the measurement circuit.
-
Disconnect the safety test leads from the BENNING MM 7.
-
Turn the rotating switch to the "OFF" position.
-
Remove the protective rubber holster from the BENNING MM 7.
-
Lay the BENNING MM 7 on its front and loosen the screw from the cover of
the battery compartment.
-
Lift the battery-compartment cover (at recesses in housing) off the bottom
part.
Do not loosen any of the screws on the printed circuit of the
BENNINGMM7!
-
Remove the two outer screws (black) and the two screws beside the printed
circuit from the base of the housing.
10/ 2006
Battery replacement
B ENNING MM 7
20
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