ETS-Lindgren HI-6006, User Manual, Page: 41 / 92

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Note : For NiMH
Batteries:
The HI-6053 Field
Probe contains four
AAA Nickel-Metal
Hydride (NiMH)
batteries, and uses
the Series H-491198-01
Battery Charger.
Before operating
the Series H-491198-
01 Battery Charger,
see Laser Safety
Considerations.
APPENDIX A: SERIES H-491198-01 BATTERY
CHARGER
Introduction
The H-491198-01 Nickel Metal
Hydride (NiMH) Battery Charger is
a dual power source battery charger.
It charges 4.8 volt 220 mA NiMH
batteries and is powered by 85-264
VAC line power or 12.5 VDC. The
H-491198-01 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.
Housed in a rugged enclosure, power enters the battery charger through
a power entry module, which contains the fuses, or an optional cigarette
lighter plug adapter. The front 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