ETS-Lindgren HI-4433-STE Electric Field Probe - Manual (Page 34)

34 | Series H-491198-36 Battery Charger
B ATTERY L IFE
A fully-charged battery (nominal output voltage of 3.6 VDC) provides up to 20
hours of operation. When the battery has discharged to 3.3 VDC, the Field Probe
is still operational, but the battery needs charging. When the voltage drops below
3.18 VDC, measurement accuracy will be compromised by further operation.
Follow these recommendations to ensure maximum battery life and optimum
testing performance:
• Operate the Field Probe only within the optimum operating
temperature range of +20 º C to +30 º C (+68 º F to +86 º F). Although
NiCd batteries are rated for operation in temperatures from
-20 º C to +65 º C (-4 º F to +140 º F), operating the Field Probe at
temperature extremes reduces the operating time of the batteries.
• Make sure the battery is fully charged before resuming operation. The
battery does not require periodic deep discharges to reverse the effect
caused by repeated shallow discharges, but undercharging can reduce
battery capacity.
If the battery exhibits low terminal voltages during charging, or if it appears
unable to acquire or maintain a charge, individual cells in the battery may be
shorted or damaged. If your battery needs replacement for any reason, contact
ETS-Lindgren Customer Service.
C HARGING A B ATTERY
1. Make sure the power switch on the Field Probe is set to the OFF
position or the battery will not charge.
2. Connect the battery charger to the proper power source, and then
connect the charger to the charger jack on the Field Probe.
Charging takes approximately one hour, depending on the degree of
battery discharge. When charging is complete, the battery charger
automatically enters into a trickle charge, and continues until the Field
Probe is disconnected.
Never attempt to recharge a non-rechargeable
battery.