:FREQuency:CENTer
Sets the center frequency of
a
sweep. Changing
the
center frequency
will alter the start and stop but not the span if the command is not
accompanied by other commands. When more than two settings are
issued in one message, only the last two will be effective.
:FREQuency:SPAN
This command sets the frequency span. Changing the span alters the
start and stop but not center. When more than two span values are
issued in one message, only the last two will be effective. The SPAN
command has three sub commands as follows:
:FREQ:SPAN:HOLD
The hold command provides a facility for
maintaining the span frequency as set, so that it is not altered
by variations in other associated settings, such as STARt and
CENTer. Hold has boolean values ON and OFF. When
:HOLD:ON
is specified, Span can only be changed by issuing a new :SPAN
value.
:FREQ:SPAN:LINK
This command allows the default coupling for
Span to be overridden. Link selects a parameter which is either
CENTer, STARt or STOP, that shall not be changed when the
value of SPAN changes. For example, if Link is set to STARt, then
changing Span causes Center and Stop to change but not Start.
1
:FREQ:SPAN:FULL
When this command is received, the Start
frequency is set to the minimum available value and Stop is
set to the maximum value. This provides a sweep setting that
encompasses the full instrument range. Center and Span will be set
to their coupled values. :FULL is an event and therefore has no
associated query or reset value.
There is a difference between
:FREQ:SPAN:FULL and
:FREQ:SPAN MAX. The former command sets START to MIN
and STOP to MAX whilst probably changing the SPAN and
CENTER. The latter command enlarges the SPAN but maintains
CENTER,
i.e. SPAN expands equally either side of CENTER until
either STARt or STOP reaches its currently allowed limit.
5-18
Command
Reference
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