Operation Manual
MI 3310 / MI 3310A SigmaGT General description
10
1.4 Battery and charging
The instrument uses six C size alkaline or rechargeable Ni-Cd or Ni-MH battery cells.
Battery condition is always displayed in the lower right display part.
In case the battery is too weak the instrument indicates this as shown in below. This
indication appears for a few seconds and then the instrument turns itself off.
Discharged battery indication
The battery is charged whenever the instrument is connected to mains voltage. The
instrument automatically recognizes the connection to the mains voltage and begins
charging. Internal circuit controls charging and assures maximum battery lifetime.
Indications of battery charging
When connected to an installation, the instruments battery compartment
can contain hazardous voltage inside! Before opening battery compartment
cover, disconnect all accessories connected to the instrument and switch off
the instrument.
Ensure that the battery cells are inserted correctly otherwise the instrument
will not operate and the batteries could be discharged.
If the instrument is not to be used for a long period of time, remove all
batteries from the battery compartment.
Alkaline or rechargeable Ni-Cd or Ni-MH batteries (size C) can be used. Metrel
recommends only using rechargeable batteries with a capacity of 4000 mAh or
higher.
Do not recharge alkaline battery cells!
1.5 New battery cells or cells unused for a longer period
Unpredictable chemical processes can occur during the charging of new battery cells or
cells that have been left unused for a longer period (more than 3 months). Ni-MH and
Ni-Cd cells can be subjected to these chemical effects (sometimes called the memory
effect). As a result the instrument operation time can be significantly reduced during the
initial charging/discharging cycles of the batteries.
In this situation, Metrel recommend the following procedure to improve the battery
lifetime:
Procedure Notes
Completely charge the battery. At least 14h with in-built charger.
Completely discharge the battery.
This can be performed by using the
instrument normally, until the instrument is
fully discharged.