ETS-Lindgren HI-4422 Field Probe (Archived) - Manual (Page 94)

• PENDING (amber)—Indicates the battery charger detects a battery.
Before fast charging can begin, the battery voltage must fall within
predetermined acceptable limits. A pulse-trickle charge is provided to
bring a depleted battery to a valid charge prior to fast charge.
• CHARGING (amber)—Indicates the voltage pre-qualification condition
has been met, and fast charge has started.
Fast charging continues until termination by a peak voltage detect or a
maximum charge time. For peak voltage detect, the fast charge is
terminated when the battery voltage is lower than the previously
measured values by 24mV. If a peak voltage is not detected, then the
fast charge is terminated when the maximum time limit of 180 minutes
is reached.
• COMPLETE (green)—Indicates a fast charging peak voltage is
detected.
If the probe is turned on during the fast charge period of the charge
cycle, the current surge that the battery provides to the electronics in
the probe will cause a momentary voltage drop on the battery, causing
the charger to terminate the fast charge based on a peak voltage
detect condition.
The battery charger switches to top-off charge mode that provides a charge
current one-eighth of the fast charge rate. This charge continues from the time
when a peak voltage detect terminates the fast charge, until the maximum time of
180 minutes is reached. If the probe is disconnected from the charger at this
point in the charge cycle, the battery will operate properly.
Following the maximum time of 180 minutes, a pulse-trickle charge mode is used
to compensate for the self-discharge of the battery while idle in the charger.
The batteries are small, and the fast charge current is low. The fast charge
current is low enough that there is not always enough heating of the battery cells
to cause the voltage to drop. With no voltage drop there is no peak voltage
detection, and the fast charge will terminate after the maximum time of 180
minutes is reached.
94 | Series H-491198-48 Battery Charger for NiMH Batteries
Archived 6/29/10
Use only the content for
HI-4422 in this manual.
Disregard content for
all other probe models;
see ETS-Lindgren
website for other
probe content.