Chapter 1. General Information
USM Go Operator’s Manual 3
1.1 Supplying Power to the Instrument (cont.)
The USM Go can be powered in either of two ways (see Figure 1 on page 2):
• A lithium battery pack that is installed in a compartment on the rear of the case, or
• An external power adapter plugged into the connector on the side of the case
CAUTION! Use only the GEIT Lithium battery pack in this instrument, and charge only this battery pack in the instrument or in
the provided GEIT charger/adapter.
To remove the battery compartment cover, loosen the two 1/4-turn screws and then lift up on the slot between the screws. The standard
GEIT Lithium battery pack is designed to provide maximum operating life between chargings.
The approximate level of remaining battery life is shown on the display (see Figure 2 on page 5) by the battery icon, , and the
approximate “hours of charge” indication below the icon. When a fully-charged battery pack is installed, the icon will appear as “full,” and
the icon will begin to “empty” as the battery life is depleted. When the battery indicator is down to one-quarter full, charge the battery pack
as soon as possible.
Note: The instrument automatically shuts OFF when the batteries are too weak for reliable operation. However, your settings are saved
and then restored when the instrument is turned back ON. When testing in remote locations, always carry a spare battery pack.
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