ETS-Lindgren HI-6006, User Manual, Page: 87 / 92

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Note : The HI-6053
Field Probe contains
four AAA Nickel-
Metal Hydride (NiMH)
batteries, and uses
the Series 1517910
Battery Charger.
Before operating
the Series 1517910
Battery Charger, see
Safety Information.
APPENDIX G: SERIES 1715910 BATTERY CHARGER
FOR NiMH BATTERIES
Introduction
The 1715910 Nickel-Metal Hydride
(NiMH) Battery Charger charges
4.8 volt 220 mA NiMH batteries and
is powered by a 12VDC wall mount
power supply. The 1517910 Battery
Charger uses a -(dV)/(dT) negative
delta V technique to determine
when the battery is fully charged,
which is typically two hours. With
this technique, the charge state of
the battery has no effect other than
shortening the charge time.
The top face of the battery charger displays LEDs that provide the operating
status. The battery charger connects to the device being charged through a
short cord terminated with a power jack.
An integrated circuit within the battery charger monitors the battery voltage
and controls the charging functions according to the charge state of the battery.
Battery Life
The NiMH batteries powering the battery-operated probe have high energy
density for maximum operating time between charges, but also have a
significant self-discharge characteristic. When the probe is stored for longer
than a week or two, the batteries will discharge even though not in use. Leaving
the batteries in a discharged condition for long periods of time may result in
reduced battery life. For optimum testing time, charge the batteries before use.
The battery charger is microprocessor controlled to charge the batteries in
the fastest possible manner. When the charger senses that the batteries are
fully charged, the charging current drops to a maintenance level. This level is
sufficient to maintain the full charged without causing battery damage. It is
acceptable to leave the probe connected to the battery charger for extended
periods of time.
With proper care, the batteries should last two to three years. Follow these
recommendations to ensure maximum battery life and optimum testing
performance:
• Turn the probe off when the probe is not in use. Leaving the probe on for
extended periods of time will damage the batteries. When the batteries are
discharged, the flashing power
ON indicator will not function.
• When possible, leave the robe connected to the battery charger, and
the battery charger connected to the mains electrical supply (charger