3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
screen even if Center Frequency was changed (which means that the marker’s
frequency changed). In the X-Series, markers are value markers, which means
that when the instrument’s X Axis settings are changed, the marker’s X Axis
value in fundamental X Axis units remains unchanged. For example, if you put a
marker at a particular frequency, it will stay at that frequency regardless of
whether you change the instrument Center Frequency, even if that means that
the marker ends up offscreen
–
While this change resulted in an overall higher level of usability of the marker
system, there are some use cases where the user depends on the marker staying
at the center of the screen. The most common one is where the user turns on a
marker at center screen and uses it to measure the trace amplitude at the center
frequency or at a series of center frequencies, without the need to ever move the
marker. In the X-Series, to mimic the legacy behavior for this use case, you must
turn the marker off and then back on after changing the center frequency of the
instrument. This causes the marker to reappear in the center of the screen
–
Also, because of the change from position markers to value markers, markers
can be at a frequency that is offscreen, whereas in the past, they were clipped to
the screen edges and hence were never offscreen. If your remote programming
depended on this clipping behavior to force markers to the edges of the screen,
you will need to modify the code. Furthermore, since markers could never be
offscreen they always returned a valid result. In the X-Series, markers that are
offscreen return Not a Number as a result; hence the potential now exists for Not
a Number to be returned for a marker query
Setting the Marker X Position in Trace Points
Sets the marker X position in trace points. It has no effect if the marker control mode
is Off, but it is the SCPI equivalent of entering a value if the control mode is Normal,
Delta, or Fixed – except the setting is in trace points rather than X-Axis Scale units.
NOTE
The entered value in Trace Points is immediately translated into the current X
Axis Scale units for setting the value of the marker. The marker’s value in X Axis
Scale Units,
not
trace points, is preserved if a change is made to the X Axis scale
settings. Thus, if you use this command to place a marker on bucket 500, which
happens at that time to correspond to 13 GHz, and then you change Start Freq
so that bucket 500 is no longer 13 GHz, the marker will stay at 13 GHz,
not
at
bucket 500! This is important to realize as it differs from the behavior of past
HP/Agilent/Keysight analyzers.
Remote
Command
:CALCulate:MARKer[1]|2|…|24:X:POSition <real>
:CALCulate:MARKer[1]|2|…|24:X:POSition?
Notes If the specified marker is Fixed, and a Marker Function is on, a message is generated. If the control is
pressed, an advisory message is generated. If the equivalent SCPI command is sent, this same
Spectrum Analyzer Mode User's &Programmer's Reference 311
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