OCP and OPP Functions Korad KEL103

On the Korad KEL103 there are two important test functions labelled OCP and OPP, but what are they? Both of these test functions are designed to prevent an overload on the device. With these features, the KEL103 will allow the user to test their device with damaging it.

OCP stands for Over Current Protection, as you probably guessed, it keeps the incoming current from damaging the device by setting the value for current. The product manual explains: "when the voltage reaches the V_on value, it will delay the current outputs. Then at intervals, the step value will decrease progressively until it reaches the cutoff current, or if the voltage is higher than that set by OCP, and then the output ends. After that, if the voltage is higher than the OCP voltage and the current value is between the maximum and the minimum set currents, it passes; otherwise, it fails."

OPP stands for Over Power Protection, this feature functions similarly to OCP but the set value is for power.

It is important to know how to properly use these tests because there are two separate steps that need to be done to test. The first set of steps is to put in the parameters for the test and the second set of steps is to initiate the test you created (for inputting values use the knob or the number pad):

OCP Testing Function Walk-through Setup:

1. Press "Shift", then "9" to enter the unit into OCP setup
   *For the following steps, press "Enter" after each action*
2. Decide which storage to use (1-10) then press "Enter"
3. Input the "____" value.
4. Input the time delay. (in seconds)
5. Enter a current range.
6. Enter the beginning current.
7. Enter the current step value.
8. Enter the reduction time.
9. Enter the ending current value.
10. Enter OCP voltage.
11. Enter maximum current.
12. Enter minimum current.

OCP Testing Function Walk-through Execution:

1. Press "Recall" then "9" to use the OCP test.
2. Select the storage memory space used above then press "Enter"
3. Press the "ON/OFF" button to start the program.
   When one of the conditions entered above is reached the load will automatically close the output.

OPP Testing Function Walk-through Setup:

1. Press "Shift", then "5" to enter the unit into OPP setup
   *For the following steps, press "Enter" after each action*
2. Decide which storage to use (1-10) then press "Enter"
3. Input the "____" value.
4. Input the time delay. (in seconds)
5. Enter a current range.
6. Enter the beginning power.
7. Enter the power step value.
8. Enter the reduction time.
9. Enter the ending power value.
10. Enter OPP voltage.
11. Enter maximum power.
12. Enter minimum power.

OPP Testing Function Walk-through Execution:

1. Press "Recall" then "5" to use the OPP test.
2. Select the storage memory space used above then press "Enter"
3. Press the "ON/OFF" button to start the program.
   When one of the conditions entered above is reached the load will automatically close the output.

If at any point during either process you need to exit the program, press "ESC"