Source Mode Operation 
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5.10 Programmable Output Impedance 
The function of programmable output impedance allows user to edit the output 
R  and  L  so  as  to  simulate  the  impedance of  the AC  grid  in  accordance  with  
I E C 6 1 0 0 0 - 3 - 3 and IEC61000-3-2 standards. 
5.11 Sweep Function 
The  Sweep  function  is used  to test  efficiency  of  switching  power  supply  and 
capture the voltage and frequency at the maximum power point. The  voltage 
and frequency of power may be altered in the form of step ladder by setting the 
initial voltage, final voltage, step voltage, initial frequency, final frequency, step 
frequency and one-step time. As the test closes, voltage and frequency at the 
maximum power point may be displayed. Sweep function is not applicable under 
DC mode and DCAC mode. 
The Sweep function is not supported in multi-channel mode. 
Operating steps 
1.  Press  [Shift]  +  [F-set](Sweep)on  the  front  panel  to  enter  the  sweep 
interface, as shown in the figure below.