03/ 2011
BENNING MM 11
28
by skilled electricians with special precautions for the prevention of
accidents
.
Make the BENNING MM 11 voltage free as follows before opening the instru-
ment:
- First remove the two safety measuring leads from the object to be meas-
ured.
-
Then disconnect the two safety measuring leads from the BENNING MM 11.
- Turn the rotary switch
to the switch setting ”OFF”.
9.1 Securing the instrument
Under certain circumstances safe operation of the BENNING MM 11 is no
longer ensured, for example in the case of:
- Visible damage of the casing.
- Incorrect measurement results.
- Recognisable consequences of prolonged storage under improper condi-
tions.
- Recognisable consequences of extraordinary transportation stress.
In such cases the BENNING MM 11 must be switched off immediately, discon-
nected from the measuring points and secured to prevent further utilisation.
9.2 Cleaning
Clean the casing externally with a clean dry cloth (exception: special cleaning
wipers). Avoid using solvents and/or scouring agents for cleaning the instru-
ment. It is important to make sure that the battery compartment and battery
contacts are not contaminated by leaking electrolyte.
If electrolyte contamination or white deposits are present in the region of the
batteries or battery casing, clean them too with a dry cloth.
9.3 Battery change
Before opening the BENNING MM 11, make sure that it is free of
voltage! Electrical danger!
The BENNING MM 11 is supplied by a 9 V block battery. A battery change (see
Figure 12) is required, if
the battery symbol (
)
appears on the display
unit (battery voltage approx. 7 V).
Proceed as follows to replace the batteries:
- Disconnect the safety measuring leads from the measuring circuit.
- Disconnect the safety measuring leads from the BENNING MM 11.
- Set the rotary switch
to the switch setting ”OFF”.
- Remove the rubber protection frame
from the BENNING MM 11.
- Place the BENNING MM 11 onto its front and turn the slotted screws of the
battery compartment by 90 ° in an anticlockwise direction.
- Lift the battery compartment cover off the bottom section.
- Lift the discharged battery from the battery compartment and carefully
disconnect the battery supply lines from the battery.
- The new battery has to be connected to the battery supply lines, and
arrange these such that they are not crushed between the housing parts.
Then place the battery into the battery compartment provided for this pur-
pose.
- Engage the battery cover into the bottom section and turn the slotted
screws of the battery cover by 90 ° in a clockwise direction.
- Place the BENNING MM 11 into the rubber protection frame
See figure 12:
Battery replacement
Make your contribution to environmental protection! Do not
dispose of discharged batteries in the household garbage.
Instead, take them to a collecting point for discharged batteries
and special waste material. Please inform yourself in your
community.
9.4 Fuse replacement
Before opening the BENNING MM 11, make sure that it is free
of voltage! Electrical danger!
The BENNING MM 11 is protected against overload conditions by a fitted fuse
(G-melt insert) 1 A quick-acting and a fitted fuse (G-melt insert) 15 A quick-act-
ing (see Figure 13).
Proceed as follows to replace the fuses:
- Disconnect the safety measuring leads from the measuring circuit.
- Disconnect the safety measuring leads from the BENNING MM 11.
- Set the rotary switch
to the switch setting ”OFF”.
