ECOTEST DKG-21 Operating Manual page 52

4.3.3.10 Storage battery status control
When switched on, the dosimeter continuously controls and displays a
storage battery status on the dLCD.
It is indicated by a battery symbol consisting of four segments. When
the battery is fully charged, all segments of the battery symbol are
highlighted. When the battery is gradually discharging, segments stop to be
highlighted one by one. When the battery is fully discharged, none of the
segments are highlighted, the battery status symbol circuit flashes, and
short beeps continue.
Three and more flashing segments mean that the storage battery should
be charged.
4.3.3.11 Operability check of the detector
The dosimeter monitors the detector's operability as soon as it is
switched on. If the detector is out of order, the "Err1" symbol is displayed
on the dLCD, which means the dosimeter should be sent for repair.
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