Maintenance; Battery Replacement - Benning MM 2 Bedienungsanleitung

BENNING MM 2.
- Connect the red safety test lead to the input terminal for V, Ω,
BENNING MM 2.
- Connect the safety test leads across the diodes and read the measured
value on the digital display  of the BENNING MM 2.
- For a typical silicone diode tested in the forward-biased direction a voltage
flow between 0,500 V and 0,900 V is displayed. A display showing "000"
indicates a short circuit in the diode, whereas a display showing "1" indi-
cates an open circuit in the diode.
- For a diode tested in the reverse-biased direction the display reads "1". If
the diode is damaged, the display will show "000" or other values.
see Figure 7:
8.5 Continuity Testing with Buzzer
- Turn the rotary switch  of the BENNING MM 2 to select the appropriate
range identified by a buzzer and diode symbol.
- Connect the black safety test lead to the COM-terminal  of the
BENNING MM 2.
- Connect the red safety test lead to the input terminal for V, Ω,
BENNING MM 2.
- Connect the safety test leads to the circuit to be measured. If the circuit
resistance between the COM-terminal  and the input terminal for V, Ω,
,  falls below 50 Ω, then the built-in buzzer in the BENNING MM 2
emits a continuous tone.
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.
09/ 2013
Diode Testing
Continuity Testing with buzzer
BENNING MM 2

,  of the
,  of the
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