3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
happens, the act of changing the span restarts averaging but the first average trace
is the last trace of the auto zoom.
This function is intended to track signals with a frequency that is changing (drifting),
and an amplitude that is not changing. It keeps tracking if you are in continuous-
sweep mode. If in single-sweep mode, as described above, the instrument only does
one center frequency adjustment as necessary.
Last Span (Remote Command Only)
Changes the displayed frequency span to the previous span setting. If this command
is sent immediately after Signal Track is turned OFF, then the span setting returns to
the span that was in effect before Signal Track was turned on.
If this command is sent while in a non-zero span, and the previous value of span was
0, it returns the instrument to Zero Span. If it is sent while in Zero Span, it returns
the instrument to its last non-zero span.
Sending this command places the instrument in Center/Span frequency entry mode.
Remote Command
[:SENSe]:FREQuency:SPAN:PREVious
Example Set the span to the previous value:
:FREQ:SPAN:PREV
Dependencies If the electrical attenuator is enabled, any attempt to set Span such that Stop Freq would be >3.6 GHz
results in an error
Turns off segmented sweep
3.2.7 Marker
Accesses the Marker menu. A marker can be placed on a trace to allow the value of
the trace at the marker point to be determined precisely.
The fundamental marker operation involves setting a Marker’s X-Axis value and then
reading the marker’s Y-Axis value. From the front panel you do this using the Marker
menu, the knob and the green marker readout in the upper right corner of the
display.
Markers may also be used in pairs to read the difference (or delta) between two data
points. They can be used in Marker Functions to do advanced data processing, or to
specify operating points in functions like Signal Track and N dB Points.
Marker Right-Click Menu
If you right-click on a marker (or touch and hold a marker and wait for the circle to
close) you will see this menu:
306 Spectrum Analyzer Mode User's &Programmer's Reference
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