7. Charging the battery The charge indicator placed in the right top corner
of the display shows the charge level of the built-
in battery (see Fig. ). The battery charge level
is approximately proportional to number of black
To charge the battery when the device is on,
connect a charger included with the instrument to
the «CHG» socket (0 in Fig. ), then to the mains.
While the battery is being charged, the number of
black sectors will increase. When charging is over
all sectors are black, the device goes on operating.
The bat-tery charging time in this case is about
If the device is off when a charger is connected to
it, it will automatically switch over to the «QUICK
CHARGE» mode (a corresponding inscription
appears on the display). Charging time of a
discharged battery is about 3 hours in this mode.
When the battery charging is over, the device turns
Indicator of battery charge/discharge Fig. 11
Attention! If the battery is discharged greatly, then a display does not switch on immediately. First «CHK» red LED lights, then the device switches over to «QUICK CHARGE» mode after some time (after the battery voltage achieves a certain value), and charging process goes on as described above. Please note that the lifetime of a built-in battery is limited: in 2 years from the date of the device manu- facture it stops to provide its nominal capacity, and in 5 years it is subject to obligatory replacement re-gardless of its working state. The battery capacity value can be implicitly estimated by the charging time of a fully discharged battery. Decrease of charging time of a fully discharged battery by two times compared to the initial condition is a signal for a battery replacement. Replacement of the battery is made by the manufacturer (ELVIRA Production Company Ltd.).