Gigahertz Solutions NFA 30M Operating Manual page 10

Made in Germany
6.3 External Power Supply
For logging with external power supply use the 12 V AC
adaptor. Should the logging time exceed the typical length
of 24 to 48 hours, the probability of an unwanted shutdown
due to unexpected operating situations increases signifi-
cantly. Longer logging times can therefore not be guaran-
teed.
Long-term 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 (integrated protection circuit. The two bat-
tery cells fit tightly, but can easily be removed for the pur-
pose 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.
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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
-
Plug the AC adapter into the wall and to the NFA. Wait until the readings on
-
the display stabilize.
Disconnect the adapter from the NFA without changing its position and ori-
-
entation; wait for the display to 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.
January 2018
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© Gigahertz Solutions GmbH