3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Spectrogram when Single is pressed, making the behavior similar to that of the
Normal view
–
In Spectrogram View, Sweep Points are limited to a maximum of 1001 due to
memory concerns. On entry to this view, if the number of points is greater than
1001, it is forced to 1001; therefore, if you had a larger number of points on entry
to Spectrogram, all the traces from the Normal view are cleared out
–
In Spectrogram View, if Trace 1 is saved, exported or queried, the data that gets
saved or returned is the data from the Display Trace in the spectrogram. All SCPI
trace saves or queries for the other 5 traces return their data normally
–
Trace Copy is available in Spectrogram. If Trace 1 is the “from” trace, Copy Trace
copies the Display Trace to any other trace. Display Trace is one of up to 10000
historical versions of Trace 1, so, if the Display Trace is 150, then the 150
th
version of Trace 1 is copied to the destination trace. Since the historical trace
data is immutable, copying a trace to Trace 1 is not possible. The same is true for
Trace "Exchange" on page 1753; Trace 1 is not available to exchange
–
Selecting or moving a marker that is turned on but not on the current Display
Trace does not move the marker to the current Display Trace; it selects it, and/or
moves it, but it stays on the Trace it is currently on
–
Turning on a marker that is turned off turns it on in the center of the current
Display Trace
–
When a Peak Search is performed, if the selected marker is turned on but is not
on the current Display Trace, it is first moved to the center of the current Display
Trace before performing the search
–
If Couple Markers is On, then moving a marker to a new Display Trace causes all
the coupled markers to move by the same number of traces
NOTE
:INIT works in a slightly different fashion in the Spectrogram view. In the other
views, the following two commands perform the same function:
:INITiate:RESTart
:INITiate:IMMediate
However, in Spectrogram View, :INITiate:RESTart works like the Restart
key, and clears out the Spectrogram trace history. :INITiate:IMMediate does
not clear out the Spectrogram trace history but performs all other functions of
performing a restart.
Representation of Time
In Spectrogram view, zero time is the point where the first trace started, meaning
that each subsequent trace point is at a positive time that represents when that
Spectrum Analyzer Mode User's &Programmer's Reference 197
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