SV 971A can be powered by one of the following sources:
• Four AAA standard size batteries fitted internally. In the case of alkaline type, a new fully charged
set can operate more than 12 h (6.0 V / 1.6 Ah). Instead of the ordinary alkaline cells, four AAA
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)
• USB-C interface – 100 mA HUB.
When the instrument is powered from internal batteries, the “battery” icon is presented on the top line
of the display.
The battery condition can be checked through the Battery screen. It is also presented continuously on
the top line of the display by means of the number of bars in the “battery” icon.
When voltage of the batteries is too low for reliable measurements, the icon is red and during attempt to
switch the instrument on, the Low Battery! message occurs on the display for 2 seconds and the
instrument switches off by itself.
Powering the instrument from the USB interface is performed by
connecting its USB socket to the PC or other USB power source via the
SC 158 cable.
When the USB is connected, the instrument automatically switches
powering from the internal batteries to the USB powering. After
disconnection the USB, the instrument will automatically switch power
to the internal batteries.
Note: When the instrument is powered via USB, the internal batteries slightly discharge. You
should remember about this effect and remove the battery if discharging is undesirable.
Note: Use only high-quality USB-C cables, such as SC 158. Many poor-quality cables do not
ensure low resistance of the cable, thus disabling proper operating of the instrument.
When there is a connection to the USB interface (USB Device socket is connected by the SC 158 cable
to a PC), the “USB” icon is presented on the top of the display and the Battery screen displays the
source voltage.
Note: In case the “battery” icon is red, it is strongly recommended to use 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!
Prolonging the internal source of the instrument’s power can be achieved by means of the LCD screen
Dim Mode. You can configure the power saver function (Dim Mode) in the Screen Set. screen (path:
<Menu> / Display / Screen Set.).
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