ETS-Lindgren HI-6006, User Manual, Page: 82 / 92

82
Note : The HI-6022 and
HI-6006 Field Probes
contain four Nickel-
Metal Hydride
(NiMH) batteries, and
use the Series 1725466
Battery Charger.
Before operating
the Series 1725466
Battery Charger, see
Safety Information.
APPENDIX F: SERIES 1725466 BATTERY CHARGER
FOR NiMH BATTERIES
Introduction
The 1725466 Nickel-Metal Hydride
(NiMH) Battery Charger charges
4.8 volt 25 mA NiMH batteries and
is powered by a 12VDC wall mount
power supply. The 1725466 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.