6. BATTERY
CHARGING
The DO7e has a built-in rechargeable sealed lead acid battery, which is fully charged when
delivered. To ensure good service life from the battery, the DO7e incorporates a sophisticated
battery management system. Low battery condition is indicated by a panel mounted LED.
The battery charger is built in and the instrument may be connected to 110/ 230 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 low battery indicator will illuminate. The battery will recharge in
approximately six hours, and the DO7e 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 being left for long periods without
charge, then 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.
BATTERY
The internal battery is a sealed lead acid type. Care should be taken when disposing, and it
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 fi re.
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.
Digital Microhmmeter Type DO7e
Operating Instructions
5
