3 Preparing the NBM-520 for use
18 NBM-520 Narda
Charging the batteries
If the device is probably not going to be used for several
weeks, it should be recharged before being stored to avoid
the possibility of deep discharge of the batteries. If storage
is likely to be for a period of more than two months, remove
the batteries from the device after recharging them.
Note: Deep discharge can significantly reduce the battery capac-
ity. This is indicated by unusually short charging cycles. If
this happens, the nominal capacity can be restored by dis-
charging and recharging the batteries several times. Regen-
eration usually takes four to five recharging cycles.
Note: A complete charge cycle takes about 2 hours (with the in-
strument switched off).
Starting the charge cycle
✓ The AC line voltage must match the operating voltage of
the AC Adapter / Charger.
1. Connect the AC Adapter / Charger to the charging
socket of the NBM-520.
2. Connect the AC Adapter / Charger to the AC line.
The charge cycle starts.
The Charge LED glows red during the entire charge
cycle.
As soon as the batteries are fully charged, the AC Adapter /
Charger switches to trickle charge mode and the Charge
LED glows green.
WARNING
Charging the batteries with wrong AC
Adapter / Charger
Overheating, explosion, or ignition of rechargeable
batteries/batteries or their surroundings
You must use only the AC Adapter / Charger supplied
to charge the batteries.
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