3 Preparing the NBM-550 for use
22 NBM-550 Narda
Proper handling of rechargeable batteries
Observe the following precautions when handling
rechargeable batteries:
• Always handle the batteries with care.
• Do not drop or damage the batteries or expose them to
excessively high temperatures.
• Do not leave the batteries inside or outside the
instrument for more than one or two days in a very warm
place (e.g. in an automobile).
• Do not leave the discharged batteries in the unused
instrument for a long period of time.
• Do not store the batteries for more than six months
without discharging and recharging them in the
meantime.
• Avoid deep discharging the batteries as this could cause
the cells to reverse polarity and make them useless.
Charge state and power source
indicator
The battery charge state and the power source used are
indicated at the top right of the display:
Table 1 Charge state and power source indication
Power is supplied by the rechargeable batteries:
• Continuous display: Charge level = 10%
• Flashing display: Charge level ≤ 5%
If the charge level drops to ≤ 5%, the instrument will
switch off automatically within a few minutes.
Power is supplied by the rechargeable batteries.
The charge level is indicated in 20% steps by black
bars within the battery symbol. The batteries are
fully charged when all five bars are shown.
Power is supplied by the AC Adapter / Charger.
The batteries are charged at the same time.
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