GW Instek PEL-3000 Series User Manual - Manual (Page 190)

PEL-3000 User Manual
188
CR+CV Mode When CR+CV mode is enabled, the unit will act
as constant resistive load after the input voltage
is greater than the user-defined CV level. At the
CV level, the unit works as a constant voltage
load. This mode effectively creates a voltage
ceiling before the unit operates in CR mode.
The diagram below illustrates this.
CR + CV Mode
Load Input
Voltage
Load Current
CV level
CR Value
Note that when the source voltage is less than
the CV level, no current will flow due to a very
high impedance.
CP Mode
CP Mode When the unit is set to CP mode it will operate
as a constant power load when connected to a
constant voltage source. This means the unit
will maintain a set power level, up to the rated
current or voltage level, regardless of the input
voltage. When input voltage changes, the unit
responds by changing the current load to
maintain the set power level accordingly
(P=IxV). This is illustrated below.