EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 45
(ii) As the battery voltage under load continues to fall, the low battery alarm flag is
activated to indicate when a minimum of 10 hours battery life is remaining.
Different thresholds are automatically selected for LTC or alkaline batteries.
(iii) As the battery voltage under load finally falls below tolerance the EPD resets
(blank display). The EPD battery must be replaced.
The EPD software runs an internal battery condition test at regular intervals (between
1 and 60 minutes). This time interval is factory preset to 15 minutes and can be
adjusted via the IR communications link. 15 minutes is the preferred interval.
The EPD has an ON/OFF power saving facility, in which the detectors are turned off,
which is intended for short-term storage (e.g. overnight). In the power saving mode
the LCD will display OFF (i.e. the EPD is off - see also Section 3.5.5). In the EPD
OFF condition battery drain is reduced to approximately 20% of the drain when the
EPD is in the ON condition (i.e. fully operational). The EPD does not measure
radiation when it is OFF.
Additional information and warnings relating to the EPD battery are given in Section
6.2.
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