Operations introduction 
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The definitions of parameters shown in the above figure are as follows: 
⚫  Vo: constant working voltage of load LED of LED constant current source; 
⚫  Io: output current of LED constant current source; 
⚫  Vd: break-over voltage of diode (string); 
⚫  R: constant resistance. 
Setting CR-LED Mode 
1.  Power on the electronic load. 
2.  Select the channel. 
3.  Press  +   to enter configuration menu 
Sync On Set 
4.  Press  key to move to CR-LED. Press  key to confirm. 
On 
Off(Default) 
5.  Press  key to exit. 
6.  Press  key to enter the setup menu. 
MODE=        CC 
7.  Press    key to enter the mode selection menu <Mode>, press
key to select the mode CR, press    key to confirm. 
Const Current 
Const Voltage 
>Const Resis. 
8.  Press  key to move to Rset=7500.0. You need to set the constant 
resistance. 
Const Resis. 
Set=7500.0   
Enter    Esc 
9.  Press  key to move to Vd= 0.000V. Press  key to confirm. You 
need to set the Vd value. 
CR-LED Vdorp= 
                0.000V 
Enter          Esc 
10.  Press    key to exit 
Calculation method of Vd and R 
Definition: 
⚫  V: constant working voltage of load LED of LED constant current source;