NARDA nbm-520, Operating Manual

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3.3 Using rechargeable batteries and the AC Adapter / Charger
Narda NBM-520
17
3.3 Using rechargeable batteries and the AC
Adapter / Charger
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 in-
strument with the AC Adapter / Charger con-
nected, as this can significantly degrade the
measurement performance of the NBM-520. The
measurement accuracy figures given in the spec-
ifications cannot then be guaranteed.
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.