Load Function
• CR+CC Mode
In CRCC mode, it has to program the constant resistance and constant cur-
rent first and then start the UUT for output. When the UUT voltage starts to
output, the Load will sink in CR mode according to the programmed resist-
ance. When the voltage rises to exceed the set constant current for sinking,
it will switch to CR mode for sinking.
The CR+CC mode is commonly used in the testing of voltage limiting, cur-
rent limiting characteristics, constant voltage accuracy, and constant current
accuracy of on-board chargers, which prevents over-current protection of
on-board chargers.
• AUTO (CV+CR+CC+CW)
In Auto mode, it has to program the constant voltage, constant resistance,
constant current and constant power, and then start the UUT for output.
When the UUT voltage starts to output, the Load will sink according to the
programmed constant voltage in CV mode. When the voltage rises, it will au-
tomatically switch to CR mode and to the CC mode at last for sinking. It will
switch to CP mode for sinking if the UUT outputs high voltage abnormally.
Under this mode, the load can automatically switch among CV, CR, CC and
CW modes. It is suitable for lithium ion battery charger testing to get a com-
plete V-I charging curve. Moreover, the auto mode can avoid damaging the
UUT when the protection circuit is damaged.
Copyright © Itech Electronic Co., Ltd.
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