SV 977D can be powered from one of the following sources:
• Four AA standard size internal batteries. In case of alkaline type, with a new fully charged set, the
instrument can operate more than 12 h (6.0 V / 1.6 Ah). Instead of the ordinary alkaline cells, four AA
rechargeable batteries can be used (a separate external charger is required for charging them). In this
case, using the best NiMH type, the operation time can be increased up to 16 h (4.8 V / 2.6 Ah)
• External DC power source – 7 V DC÷16 V DC (1.5 W)
• SA 17A external battery pack – operation time > 24 h (option)
• USB interface – 500 mA HUB
When an external power source is connected, the instrument automatically switches powering from the internal
batteries to the external source. After disconnection from the external power source, the instrument will
automatically switch powering to the internal batteries.
Note: When the instrument is powering via USB, the internal batteries are slightly discharging. You
should remember about this effect and remove the battery if discharging is undesirable.
For each power source, the Battery screen (path: Menu / Instrument / Battery) has special view and special icon
reflects the powering state.
When the instrument is powered from the
internal batteries, the “battery” icon is
displayed on the top of the screen and the
Battery screen presents the battery capacity
scale and voltage: Voltage: x.xxV. The colour
of the icon and scale reflects the battery
capacity: green (>75%), yellow (>25%), red
(<25%).
To have correct indication of the battery status, select the battery type in the Type position: Alkaline or
Rechargeable.
When the voltage of the batteries is too low for reliable measurements, the icon is red or during attempt to switch
the instrument on, the Low Battery! message is displayed for 2 seconds and the instrument switches itself off.
A fully charged set of 4 batteries ensures more than 12 hours of continuous operation of the instrument (with
display Dim switched on).
Note: When the “battery” icon is red, it is strongly recommended to use an external power adapter or
USB interface as soon as possible to ensure reliable operation. If no suitable external power source
is provided the instrument will be switched off automatically after a short time!
Extension of the internal battery’s life can be achieved by reducing the brightness of the screen when possible.
The settings of Brightness and power saver function may be done in the Screen Setup screen (path: <Menu>
/ Display / Screen Setup).
When there is a connection to the USB interface, the „USB” icon appears, and
the Battery screen displays the voltage of the USB Power.
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