Cropico DO7, Operating Instructions Manual

CROPICO LTD – DO7

Issue 7/2001

4

6. BATTERY 

CHARGING

The DO7 has built-in rechargeable sealed lead acid batteries which are fully charged when
delivered.  To ensure good service life from the batteries, the DO7 incorporates a sophisticated
battery management system.  To indicate the state of charge, 8 LEDs indicate the remaining
battery capacity in % of full charge.  These LEDs are arranged in a gas gauge style.

The battery charger is built in and the instrument may be connected to 100/120/220 or 240 volts
supply.  The appropriate voltage setting must be selected on the inlet socket and the correct fuse
inserted.  The LINE LED will illuminate on the front panel to indicate when the mains supply is
connected.

Charging is automatically controlled with built-in protection circuits eliminating the possibility of
over-charging.  The display will blank when the battery voltage is too low to sustain
measurements, and the battery state indicators show the current state of charge.  The DO7 will
operate whilst charging on all ranges except the bottom two, and an additional error of
approximately 8 digits may be observed with mains supply connected. The lower ranges have a
larger measuring current than can be supplied by the charger, and therefore batteries must be fully
recharged before use.  The batteries will recharge in approximately six hours, and the DO7 lid
should be open to allow for maximum ventilation.

IMPORTANT   Always connect instrument to mains supply after use and top up battery.
Instruments should be stored with batteries fully charged, and when stored for long periods
the batteries should be recharged each month.

Should the batteries become deeply discharged due to either being stored with the
instrument switched on, or being left for long periods without charge, then it may appear
that no charging is taking place when first connected to the mains supply.  The Line LED
will light but fast charge LEDS will not.  The internal charger will automatically sense the
battery state and will trickle charge with a very low current to restore the batteries before
automatically switching to fast charge.  This low current charge may take up to 20 hours to
restore the batteries.  Continuous charging will not damage the batteries and will, in fact,
keep them in best condition.

BATTERIES

The internal batteries are a sealed lead acid type.  Care should be taken when disposing of them
and they may be returned to Cropico for safe disposal.

Any regulations and directions applying to the disposal of such material must be applied.

Do not dispose of battery in fire.

Do not short circuit.

Do not crush, puncture, open, dismantle or otherwise mechanically interfere with the battery.

NOTE:  If storing for long periods, the batteries should be fully recharged every six months.