480 Keysight InfiniiVision 4000 X-Series Oscilloscopes Programmer's Guide
20 :FUNCtion<m> Commands
:FUNCtion<m>[:FFT]:SPAN
(see page 1610)
Command Syntax
:FUNCtion<m>[:FFT]:SPAN <span>
<m> ::= 1 to (# math functions) in NR1 format
<span> ::= the current frequency span in NR3 format. Legal values are
1 Hz to 100 GHz.
If you set the frequency span to a value outside of the legal range, the
step size is automatically set to the nearest legal value.
The :FUNCtion<m>[:FFT]:SPAN command sets the frequency span of the display
(left graticule to right graticule) when FFT (Fast Fourier Transform) is selected.
Query Syntax
:FUNCtion<m>[:FFT]:SPAN?
The :FUNCtion<m>[:FFT]:SPAN? query returns the current frequency span in Hertz.
Return Format
<span><NL>
<span> ::= the current frequency span in NR3 format. Legal values are 1
Hz to 100 GHz.
See Also • "Introduction to :FUNCtion<m> Commands" on page 460
• ":FUNCtion<m>[:FFT]:CENTer" on page 471
• ":TIMebase:RANGe" on page 1285
• ":TIMebase:SCALe" on page 1289
After a *RST (Reset) or :AUToscale command, the values returned by the
:FUNCtion<m>[:FFT]:CENTer? and :FUNCtion<m>:SPAN? queries depend on the current
:TIMebase:RANGe value. Once you change either the :FUNCtion<m>[:FFT]:CENTer or
:FUNCtion<m>:SPAN value, they no longer track the :TIMebase:RANGe value.
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