Note that when the source voltage is less than the
CV level, no current will flow due to a very high
impedance.
When the unit is set to CR mode it will operate as a
constant resistance load when connected to a
constant voltage (CV) or constant current (CC)
source. This means the unit will maintain a set
resistance, up to the rated power, regardless of the
load voltage or current. When input voltage
changes, the unit responds by changing the current
load to maintain the set resistance according to
ohm’s law.
CV source : Load current = Load voltage / CR
setting value
CC source : Load voltage = Load current x CR
setting value
This is illustrated below.
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