2.2 POWERING OF THE INSTRUMENT
The SVAN 958A can be powered by one of the following sources:
• External DC power source, SA 15 – 6 V DC ÷1 5 V DC (1.5 W)
• SA 17A external battery pack – operation time > 24 h (option)
• Four AA standard size internal batteries. 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 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)
• USB interface – 500 mA HUB
The Power Supply list (path: Menu / Display / Power Supply) looks differently, depending on the current
powering source.
In the Power Supply list of the Instrument list the user can see the information about the current power source.
When the instrument is powered from its internal batteries, the “Battery” icon is presented on the top line of
the display. When voltage of the batteries is too low for reliable measurements, the icon flashes and the
instrument is trying to finish the measurement during 2 seconds, then within 5 seconds the Low power
message occurs on the display and the instrument switches off by itself.
To change the batteries the user has to switch off the instrument, take off the black bottom cover of the
instrument, unscrew battery cover, slide the battery tubes out, change the batteries taking care to observe the
correct polarity and reassemble the parts of the instrument. Fully charged set of 4 batteries ensure more than
12 hours of continuous operation of the instrument (with the backlight off). The operation time is decreased
about 20 % with the backlight switched on. The battery condition can be checked by means of the
Power Supply function. It is also presented continuously on the top line of display by means of the “Battery”
icon.
When there is a connection to the USB interface (USB Device socket is connected by means of the cable to a
PC or a USB power supply), the “Computer” icon is presented on the top of the display and in the
Power Supply list there is the message USB Power: 0.00V.
The external power (110 V / 230 V mains) adapter – SA 15 – is available for the instrument but it is not included
in the set. For the external power operation this adapter should be connected to the Power socket located on
the bottom cover of the instrument. When the instrument is powered from the external power supply the red
diode on the right corner of the front panel bottom of the device switches on and there is the
EXTERNAL POWER message in the Power Supply list (path: Menu / Display / Power Supply).
Note: In case when the “Battery” icon is flashing it is strongly recommended to use the 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!
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