2.What’s Delta peak?
3.State indicator
E 2
Let’s be clear about this. "Delta peak" is short hand for "The peak charge is detected by measuring the Delta Voltage".
"Delta" is a mathematical term which means "The change in". So what is delta peak charging ? As a Ni-Cd battery is
charged its voltage increases. This increase in voltage is technically called a positive delta V (or voltage). Positive because
the voltage is rising. It is a basic characteristic of these cells that when they are fully charged the voltage levels off and
even goes down very slightly. These conditions are known as Zero delta V and negative delta V. The CM charger looks for
this change and terminates the charge when it sees it. The CM has a 16bit AD which allows the charge to terminate in a
milli volt. E.g. for Ni-Cds it is fine to watch for negative delta V but the vlotage dip is not so pronounced in NiMH cells so it is
better to charge them using Zero delta V i.e. don't wait for the voltage to drop but cut off when the voltage levels off.(See
page 6 “ZERO DELTA PEAK”)
Voltage
7.260V
9.180V
9.177V
Minutes
Peak voltage or Zero delta peak V
Cut off
e.g. 3mV set
3mV
A state indicator blue LED is equiped on the CM which allows you could aware of the CM’s state.
On : Charging, discharging
Blinking once a second(LED turned on very short time) : Charge/discharge/cycle finished
Blinking once a second(LED turned on longer time) : Delaying
Blinking twice a second : Error occured
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