Maintenance; Battery Replacement - Benning MM 1 Instrucciones De Servicio

- Connect the black safety test lead to the COM-terminal  of the
BENNING MM 1.
- Connect the red safety test lead to the input terminal for V, Ω, µA,  of the
BENNING MM 1.
- Connect the safety test leads across the diodes and read the measured
value on the digital display  of the BENNING MM 1.
- For a typicale silicone diode tested in the forward-based direction a voltage
flow between 0,500 V and 0,900 V is displayed. A display showing"000 V"
indicates a short circuit in the diode, whereas a display showing "1,5 V"
indicates an open circuit in the diode.
- For a diode tested in the reverse-based direction the display reads "1,5 V".
If the diode is damaged, the display will show "000 V" or other values.
see Figure 7:
9.

Maintenance


Remove test leads and turn the power off before opening the
BENNING MM 1! Dangerous voltage!
Any work to be carried out on an opened BENNING MM 1 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 1 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 1.
- turn the rotary switch  to the "OFF" position.
9.1 Instrument safe-guarding
In certain circumstances, safety during the use of the BENNING MM 1 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 1 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 1 with a clean dry cloth (exception: spe-
cial cleaning cloths). Do not use any solvents and/or abrasives to clean the
BENNING MM 1.

9.3 Battery replacement


Remove test leads and turn the power off before opening the
BENNING MM 1! Dangerous voltage!
The BENNING MM 1 is powered by two 1.5 V batteries. Battery replacement
(see figure 8 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 1.
- Turn the rotary switch  to the "OFF" position.
- Remove the protective rubber holster  from the BENNING MM 1.
- Place the BENNING MM 1 on its front side and remove the screw 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 batteries from inside the battery holders.
- Insert new batteries correctly into the battery holder.
- Press the case back and case front together again and reinstall the screw.
- Place the BENNING MM 1 back into its protective rubber holster .
see Figure 8:
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.
02/ 2011
Diode Testing
Battery replacement
BENNING MM 1

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