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Operation:
When pressing the key, the display will increment shortly to “15 V”, and “Board”, as well as “Start” will be lighting for
reasons of testing.
After that, the voltage of the board battery will be displayed, and the LED “Board” will be lighting.
If the key is actuated for a second time, it will be switched to the starter battery. The LED “Start” is lighting.
Actuating the key for a third time will switch-off the Duo Storage Battery Tester S.
If the starter battery is not connected, the lowermost LED “10.5” is lighting dimly at least brightness.
10 minutes after the last activity, the display will be switched-off automatically for reasons of power saving.
Display:
The voltage is indicated by a lighting LED on the scale.
Simultaneous lighting of 2 light-emitting diodes indicates a voltage between the corresponding values.
EXAMPLE:
If the two LEDs “12.5 V” and “13 V” are lighting with identical brightness, the battery voltage is 12.75 V.
If the brightness of the light-emitting diodes is different, the battery voltage tends to the light-emitting
diode being the brighter one.
The range of operation of the lead battery 12 V is indicated by the red and green light-emitting diodes, and it is valid for
inferior to normal load (current consumption) of the battery.
Green means o. k.!
If powerful consumers with high current consumption are used, such as inverters, the battery voltage might drop below
11 V.
However, if the display is in the red range without any battery load or in case of only inferior battery load, the
corresponding battery should be recharged immediately.
If the voltage "10.5 V" is reached, switch-off all consumers in order to avoid total discharge of the battery. Now,
recharging is highly recommended !
Several times of total discharge result in loss of capacity or in destruction of the battery!
Never leave lead storage batteries in discharged condition !
An efficient protection against totally discharged board batteries is ensured by installation of a VOTRONIC
Battery Protector, which effects an automatic separation of battery and consumers.
Battery Protector 40 (12 V, to 40 A load current), order No. 3075 or
Battery Protector 100 (12 V, to 100 A load current), order No. 3078.
