5 Charging the Batteries
The Garnet has an internal 7.2v Ni-MH rechargeable battery pack that must not be
removed by the operator. The maximum autonomy of the battery pack for the Garnet is
approximately 200 hours use, actual autonomy will be dependent upon operational
process and Bluetooth usage (with PDA)
It is strongly recommended that the battery is never charged if the capacity showing on the
control panel (section 3.2) is more than 4 bars. This will correspond to a minimum of 20
hours use and so the Garnet can be safely used for one shift and then recharged.
Displaying the battery status is described in section 4.1 above.
The following procedure should be used when charging the Garnet.
1) Position the Garnet on a flat surface ensuring it is clean and dry.
2) Insert the charger DC jack into the socket found on the underside of the Garnet and
then plug the charger unit into the mains supply. The charger has an input operating
voltage range of
100VAC to 240VAC, 50-60 Hz.
3) The unit will take approximately 15 hours to charge, assuming a completely
uncharged condition.
4) Once the battery is charged, disconnect the charger from the mains supply and
remove the charging plug from the instrument. The Garnet is now ready for use.
The instrument should never be left charging for more than 24 hours
as this will cause
long-term damage to the batteries. If the Garnet is left unused, the batteries will discharge in
about 5 months, so it is recommended that the Garnet be recharged approximately ever y 4
months, even when not in use.
Under normal operating conditions it is not necessary to ‘cycle’ (discharge and charge) the
Garnet batteries, however if the autonomy of the instrument is reduced, a complete discharge
cycle may help restore the battery capacity. This is achieved by setting the ‘Power’ mode to
‘Manual’ (see section 4.1.4), restarting the Garnet and leaving it on for 24 hours (or until it
switches itself off). The unit should then be placed on charge for no more than 24 hours.
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