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Command Reference
SENSe Subsystem
Center Frequency Step Size Automatic
[:SENSe]:FREQuency:CENTer:STEP:AUTO OFF|ON|0|1
[:SENSe]:FREQuency:CENTer:STEP:AUTO?
Specifies whether the step size is set automatically based on the 
span.
*RST: On
Key access:  > CF Step Auto Man
Center Frequency Step Size
[:SENSe]:FREQuency:CENTer:STEP[:INCRement] <freq>
[:SENSe]:FREQuency:CENTer:STEP[:INCRement]?
Specifies the center frequency step size.
*RST: Span/10
Key access:  > CF Step Man
Frequency Span
[:SENSe]:FREQuency:SPAN <freq>
[:SENSe]:FREQuency:SPAN?
Set the frequency span. Setting the span to 0 Hz puts the analyzer 
into zero span.
*RST: 3.0 GHz
Key access:  > Span|Zero Span
Full Frequency Span
[:SENSe]:FREQuency:SPAN:FULL
Set the frequency span to full scale.
*RST: 3.0 GHz
Key access:  > Full Span