Frequency Control Commands 
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Chapter4   Frequency  Control  Commands 
[SOURce:]FREQuency[:IMMediate] 
This command is used to set the current output frequency of the power supply. 
Command syntax   
[SOURce:]FREQuency[:IMMediate] 
Parameters 
MINimum|MAXimum|DEFault|Float 
Example   
freq 90 
Query syntax 
[SOURce:]FREQuency][:IMMediate]?