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DATAMAN S4 MANUAL
done. You can safely leave S4 alone when
charging or continue to
use it. If the message HEAT appears when charge
is requested, it
means that the temperature is too high or too low
to be monitored.
(below 5<198>C or above 45<198>C). The
method used for detecting temperature
is to measure the voltage across a thermistor,
which is in physical
contact with the battery, which does not make an
accurate thermometer
- but it is good enough to observe a 5<198> rise.
S4 does not permit
fast charging of batteries which are outside the
5<198> and 45<198>
limits, because battery manufacturers do not
recommend it.
The Fuel Gauge
Across the top of the display is a bar-graph
showing S4's estimation
of remaining battery capacity. This really is an
estimation: it is
not possible to measure charge in a Nicad by
looking at its voltage
or by any other means. S4 keeps track of power
usage from the last
fully charged state. The FUEL GAUGE represents
S4's guess at how
much charge remains. It isn't perfect - but it's a
lot better than
no guess at all. The FUEL GAUGE will be wrong
in the following circumstances:
1)
If the battery was changed or removed
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