NARDA nbm-520 - Measuring with the NBM-520

3.3 Power supply
Narda NBM-520 17
3.3 Power supply
The power supply is normally taken from the batteries pro-
vided. You can use the AC Adapter / Charger supplied as an
alternative power source.
Note: We do not recommend that you operate the instrument with
the AC Adapter / Charger connected, as this can signifi-
cantly degrade the measurement performance of the
NBM-520. The measurement accuracy figures given in the
specifications cannot then be guaranteed.
Operation from rechargeable batteries
The rechargeable NiMH batteries for this device are
packaged separately. You must insert the batteries into the
device and then charge them up fully before using the
device. The charging cycle takes about 2 hours. Do not use
dry batteries in this device.
Inserting the batteries
1. Open the battery compartment cover underneath the
device by undoing the two screws with a screwdriver or
the edge of a coin.
2. Take the NiMH batteries provided out of their protective
foil and insert them into the battery compartment. Make
sure you put them in the right way round. The positions
of the positive and negative poles are marked in the
battery compartment by "+" and " –" respectively. Match
the markings to the markings on the batteries.
3. Close the battery compartment cover and do up the two
screws again to secure it.
Notice
Improper pole positions
The batteries can explode and damage the instrument
if you put the batteries in the wrong way round.
 Observe the positions of the positive and negative
poles marked in the battery compartment.
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