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will show the word CC_UN or Unreg. CC_UN means the load was successfully set into the expected
constant current value; Unreg means the load could not adjust itself to the desired constant current value.
Please check thatthe power supply under test has been correctly connected and power switched on; make
sure thatthe voltage set is normal and the selected constant current value is within the range of the UUT.
While in loading and unloading CC mode, press the Shift+1(V_Level)keys in sequence and the DC
Electronic Load will revert back into the standard constant current mode.
4.1.1.3 Soft Start Constant Current Mode
The Soft Start CC mode enables the DC Electronic Load to functions as an inductive load, simulating
an inductance value which is in direct proportion with the rise time of the soft start. In this mode, the power
supply under test can avoid being damaged by a current strike .
Load current
I
T
Rising Time
Load current
I
T
Rising Time
Diagram 4.3 Soft Start Current Mode
When in standard CCmode, pressing the Shift+2(S_Start) keys in sequence places the load in the
soft start CCmode. When the VFD display shows Rising TM=xxxxxxxxvmS indicating the current rise
time, usethe numeric keys and decimal point key to enter the current rise time desired. Follow by pressing
the Enter keyto confirm the setting and the load will enter into the soft start CC mode.
If the input state is OFF, then the upper right corner of the VFD display will show the word OFF. Press
the On/Off key to change the input state to ON . Then the upper right corner of the VFD display will show
the word CC_S or Unreg. Showing CC_S means the load has been successfully set with the desired CC
value; Unreg on the display means the load couldn’t adjust itself to the desired CCvalue. Check to assure
that thepower supply under test has been correctly connected and powered on; make certain that the - CC
value selected is within the range of the UUT.When the Shift+2(S_Start) keys are pressed in sequence,
the loading and unloading CC mode, of the DC Electronic Load will revert back into the standard CC mode.
Note: The rise time is automatically regulated and set to a value of 20μS times a round number.
4.1.1.4 Constant Current Mode Shifting into Constant Voltage Mode
When the CC mode shifts into CV mode, damage to the power supply under test from current strike is
avoided.
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