Maintenance; Battery Replacement; Fuse Replacement - Benning MM 2 Manuel De Instrucciones

see Figure 8:
9.

Maintenance


Remove test leads and turn the power off before opening the
BENNING MM 2! Dangerous voltage!
Any work to be carried out on an opened BENNING MM 2 under voltage is
strictly reserved for qualified electrotechnical personnel who must take special
precautionary measures to avoid accidents.
This is how to ensure that the BENNING MM 2 is free from any voltage before
the instrument is opened:
- first remove the safety test leads from measured object.
- then remove both safety test leads from the BENNING MM 2.
- turn the rotary switch  to the "OFF" position.
9.1 Instrument safe-guarding
In certain circumstances, safety during the use of the BENNING MM 2 can no
longer be guaranteed; when for instance:
- there is visible damage to the housing
- measurement errors occur
- the instrument has been subjected to prolonged storage under unfavorable
conditions and
- the instrument has been subjected to severe transport stresses.
In such cases the BENNING MM 2 must be immediately switched off, removed
from the measurement points and secured against any future unintentional
operation.
9.2 Cleaning
Wipe the case of the BENNING MM 2 with a clean dry cloth (exception: spe-
cial cleaning cloths). Do not use any solvents and/ or abrasives to clean the
BENNING MM 2.

9.3 Battery replacement


Remove test leads and turn the power off before opening the
BENNING MM 2! Dangerous voltage!
The BENNING MM 2 is powered by a 9 V block battery. Battery replacement
(see figure 9 below) becomes necessary when the low battery indicator shows
in the display .
This is how to change the battery:
- Remove the safety test leads from the measured circuit.
- Remove the safety test leads from the BENNING MM 2.
- Turn the rotary switch  to the "OFF" position.
- Remove the protective rubber holster  from the BENNING MM 2.
- Place the BENNING MM 2 on its front side and remove the three screws
from the case back.
- Lift the end of the case back near the input terminals until it gently unsnaps
from the case front at the end nearest to the LCD display .
- Remove the empty battery from inside the case front and carefully discon-
nect it from the battery connector leads.
- Snap the battery connector leads to the terminals of a new battery and
reinsert the battery into the case front. Ensure that the battery leads do not
become pinched between the case back and case front.
- Press the case back and case front together again and reinstall the three
screws.
- Place the BENNING MM 2 back into its protective rubber holster .
see Figure 9:
Please contribute to environmental protection! Batteries should

not be thrown into domestic refuse bins! They can be discarded
at collection points for old batteries or special refuse. Please
contact your municipality for more information.

9.4 Fuse replacement


Remove test leads and turn the power off before opening the
BENNING MM 2! Dangerous voltage!
The BENNING MM 2 is protected from overloading by a built-in 1 A
08/ 2008
Continuity Testing with buzzer
Battery replacement
BENNING MM 2

14