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Span
Span
Activates the Span function and displays a menu of span functions.
Span
Changes the displayed frequency range symmetrically about the center frequency. While adjusting the
Span the Center Frequency is held constant, which means that both Start Frequency and Stop Frequency
will change.
Span also sets the frequency entry mode to Center/Span. In Center/Span mode, the center frequency and
span values are displayed below the graticule, and the default active function in the Frequency menu is
Center Freq.
While discussing the Span function we make the distinction between “swept spans” and “zero span”. We
use the term “swept spans” to mean spans other than zero; recognizing that, because of this terminology,
the user can be in what we call a “swept span” even while performing an FFT “sweep”.
While in swept spans, setting the span to 0 Hz through SCPI or the front panel numeric key pad puts the
test set into zero span. However, using the Step keys and the RPG in swept spans, the Span can only go
as far down as 10 Hz and cannot be set to zero.
While in zero span, setting the Span to a non-zero value through SCPI or the front panel puts the test set
in swept spans.
If the Span is set to a value greater than the maximum allowable span of the test set, an error is generated
indicating the data is out of range and was clipped to upper limit.
Initial S/W Revision: Prior to A.02.00
Key Path
SPAN X Scale
Remote Command [:SENSe]:FREQuency:SPAN <freq>
[:SENSe]:FREQuency:SPAN?
Example FREQ:SPAN 2GHz sets the span to 2 GHz
FREQ:SPAN 0 Hz sets the span to 0 Hz and puts the test set in Zero Span
Notes Preset and Max values depend on the Hardware Options
Dependencies If the electrical attenuator is enabled, any attempt to set Span such that the
Stop Frequency would be >3.6 GHz results in an error. If the key is pressed,
an advisory message is generated. If the equivalent SCPI command is sent,
this same message is generated as part of a “–221, Settings conflict” warning.