Gigahertz Solutions NFA 30M Operating Manual page 10

Made in Germany
6.3 Data Logging with
External Power Supply
You can perform this task with the supplied 12 V AC adapter.
However, unfavourable conditions may cause falsifications of the
measurement through noise, dirty power or RF over coupling. In order
to be on the safe side there are two options:
Ring ferrites attached to both ends of the respective cables avoid
these falsifications (available from us as a low-cost do-it-yourself solu-
tion "EDY").
Another solution for avoiding these falsifications is the use of an exter-
nal 12 V battery for off-grid long-term recordings. Most suitable for
this purpose are standard gel or AGM (motorcycle) batteries (no lith-
ium! 5 ). We have configured a universal adapter cable for you
("BAK_U").
The maximum size of a log file that can be opened with NFAsoft (1GB)
is reached after 16 days of continuous recording. The longer the log-
ging time exceeds the specified 36 hours, the higher the risk of an un-
wanted shutdown – mainly caused by the internal electronics of the SD
memory card. Longer logging times can therefore not be guaranteed.
6.4 Battery Change
For safety reasons, please only use original battery packs classified by
us (integrated protection circuit. The two battery cells fit tightly, but can
– with some patience – easily be removed for the purpose of battery
change. In no case untighten the screws of the meter! Putting the me-
ter together is very complicated, and therefore subject to a fee if it
needs to be done by one of our technicians.
In order to calibrate the battery life indication on the display, the newly
connected batteries need to be either charged until "FULL" appears on
the display, OR discharged until the NFA switches itself off automati-
cally.
5
Extensive testing with classical power banks and lithium polymer batteries for flight
models showed disappointing results.
April 2020
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© Gigahertz Solutions GmbH