The USB-C Device 2.0 interface is the serial interface working with 12 MHz clock in the full speed mode
and with 480 MHz in the high-speed mode, which is a default mode of the instrument. Thanks to its
speed, it is widely used in all PCs. The standard 4-pin socket is described in detail in Appendix C.
Note: Switch the power off before connecting the instrument to any other device (e.g. a printer
or a Personal Computer) or fitting the microphone capsule.
SV 973 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 20 h (6.0 V / 0.8 Ah). Measurements with the display off extend the
working time to more than 30 h.
• 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-C 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
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.
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-C 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-C 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.).
2.3 CONTROL KEYS ON THE FRONT PANEL
Control of the instrument has been developed in a fully interactive manner. The user can operate the
instrument by selecting the appropriate position from the screen Menu list. Thanks to that, the number
of the control keys of the instrument has been reduced to eight for ease of use and convenience.
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