Power Supply - Gigahertz Solutions NFA 30M Operating Manual

6 Power Supply

6.1 Internal Rechargeable Battery
The instrument features high performance Lithium Ion rechargeable
batteries (2 x 3.7 V). When fully charged, they will last for at least two
days of data logging 4 .
A vital factor for the durability of Lithium Ion rechargeable batteries is to
absolutely avoid a deep discharge and also avoid storage when
charged to a maximum. Ideal would be a loading state of around
75%.The NFA setting will prevent a deep discharge in operation, how-
ever, in view of the inevitable self-discharge, the meter should never be
kept with "almost empty" batteries.
Shelf life without deep discharge with initially ¾-full batteries:
 3 to >9 Months
(the big variations are caused by the varying "off-line" power
consumption of SD memory cards
 >3 years with disconnected SD memory card
 For longer storage the batteries should be disconnected from the in-
strument.
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 esti-
mated running time in the log mode with the current capacity status.
Measurements or recordings during the charging process are techni-
cally possible, but this is no specified status and thus not recommend-
able.
When fully loaded, a maximum of two days, 8 hours running time will
be displayed ("2d08"). Mostly, longer times can be achieved, but this
should be considered as "hidden reserve". Due to the large variation in
the Lithium Ion batteries supplied by their manufacturer, the maximum
capacity as well as the charging time are subject to fluctuations.
The specified battery life is already reached after a charging period of
approx. 8 hours. A (significantly) longer charging period may considera-
bly extend the battery running time.
The maximum capacity will be reached after roughly 15 hours and is in-
dicated by a "FULL" on the display.
"nbAt" on the display indicates that the 15 V AC adapter should be dis-
connected in order to save battery life.
4 Please note that Li-Ion batteries, even when treated with care, will lose some of their
original capacity within one or two years, and their typical life expectancy is 250-500
complete charge cycles. In this case always replace both batteries.
© Gigahertz Solutions GmbH
- 7 -
Made in Germany
April 2020