External Power Supply; Battery Change - Gigahertz Solutions NFA 30M Operating Manual

6.2 Charging
To charge the batteries use the 15 V AC adaptor. If the device is switched off while
charging, the display will show "CHAr" and the potential runtime of the instrument
with the current capacity status in an infinite loop. Measurements or recordings dur-
ing the charging process are technically possible, but not specified, and therefore
not recommendable.
With a completely discharged battery only about one hour of charging time is suffi-
cient to operate the instrument for a couple of hours. To achieve the maximum op-
eration time, charging will take 12 to 15 hours. Once the full capacity is reached, the
instrument will stop charging automatically and will show "FULL" on the LCD.

6.3 External Power Supply

For logging with external power supply use the 12 V AC adaptor. After a logging
time of more than the typical 24 to 48 hours the probability of an unwanted shut-
down due to unexpected operating situations increases significantly. Longer logging
times can therefore not be guaranteed.
Longterm recordings of the 3D magnetic field and the AC entry can also be done
using external power from an AC adapter. In this case, the adapter should be placed
as far as possible from the instrument and turned in such a way that the resulting
magnetic field is as low as possible, as it can influence the readings.

6.4 Battery Change

For safety reasons, please only use original battery packs classified by us (integrat-
ed protection circuit. The two battery cells fit tightly, but can easily be removed for
the purpose of battery change. In no case untighten the screws of the meter! Putting
the meter together is very complicated, and therefore subject to a fee if it needs to
be done by one of our technicians.
6 To determine the emission created by the AC adapter at the location of the NFA, proceed as follows:
Place the instrument and adaptor into their measurement location
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Plug the AC adapter into the wall and to the NFA. Wait until the readings on the display stabilize.
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Disconnect the adapter from the NFA without changing its position and orientation; wait for the display to
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stabilize.
This procedure will also be logged and is available when evaluating the logged data on the PC. Now potential
disturbances can be noted on each axis and corrections be made, if necessary.
© Gigahertz Solutions GmbH
- 7 -
Made in Germany
6
February 2016