Information on Charging the Battery
PEM9002 is equipped with an NiCad storage battery. The service life and capacity of the battery are considerably affected by the way the instrument is charged and used. In order to make the handling safer, the instrument has a load management unit.
If an NiCad battery is, for example, always charged from 80% to 100% and never run down to the final discharge voltage, it will lose some of its capacity. This is called the 'memory effect' , i.e. the battery remembers to what extent it is run down.
A part of this memory effect is suppressed in the PEM9002 in that the battery cannot be recharged until it has dropped below 60%.
Constant overcharging, too, has adverse effects on the NiCad battery. In order to prevent this, the charged capacity, the voltage and the temperature of the battery are monitored in the PEM9002.
When predefined limits are exceeded, the charging process is interrupted. After the appropriate parameters have been neutralized the charging process is automatically restarted again.
The service life of the NiCad battery can be significantly reduced when the instrument is operated at temperatures below 40 °F (5°C).
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