ETS-Lindgren HI-6153 Electric Field Probe - Manual (Page 93)

Series H-491198-48 Battery Charger for NiMH Batteries | 93
Appendix C: Series H-491198-48 Battery Charger
for NiMH Batteries
The HI-6022 and HI-6005 probes contain a Nickel-Metal Hydride
(NiMH) battery, and use the Series H-491198-48 Battery Charger.
S AFETY P RECAUTIONS
Before operating the Series H-491198-48 Battery
Charger, see General Safety Considerations on
page ix.
I NTRODUCTION
The H-491198-48 Nickel-Metal Hydride
(NiMH) Battery Charger is a dual power
source battery charger. It charges 4.8 volt
25 mA NiMH batteries and is powered by
85-264 VAC line power or 12.5 VDC. The
H-491198-48 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.