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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

the Zone Span view, the focus is always in the Zone Window, so it is the window that

is updating. To change the focus, tap another window. Single and Continuous

settings apply, so if the instrument is in Single, no sweep actually happens until it is

initiated, or you go to Continuous.

NOTE

The selected window is the window to which virtually all key presses and SCPI

commands are directed. Most control functions, such as Center Frequency,

Reference Level, etc., apply only to the selected window. Similarly, any traces

that are exported or queried while in Zone Span return the data from the

currently active window. Because of this dependency, it is important to allow the

SCPI system to synchronize after switching windows. Therefore, if you have just

switched windows via SCPI (using :DISP:WIND) you should wait at least one

second before sending any window-dependent command, to ensure that SCPI

will direct the command to the correct window.

Transition Rules

When you enter the Zone Span view, the top window takes on all of the traces,

markers and settings that were present in the Normal view. Zone Center is the same

as the instrument Center Frequency, and Zone Span is 10 % of the instrument Span.

When you leave the Zone Span View, the current window traces and settings carry

over to the next view. The traces from the other window will all now be gone. To

mitigate this fact, whenever you save state while in Zone Span, and then recall the

state, Zone Span returns just as it was when you saved the state, including all trace

data and settings for both windows (of course, any traces that were updating when

you did the save will load in an updating state, so their data will be erased after the

first sweep). So, if you want to preserve the data in both windows, make sure you put

the traces in View and save the state before you exit.

3.2.2.3 Zoomed Trace

Window #3

In the Trace Zoom view, the screen is split into two windows. The top window is a

normal spectrum analyzer window, and the bottom window (Zoomed Trace) shows a

“zoomed” representation of the traces in the top window.

Views in which the Zoomed Trace window appears:

View Size Position

"Trace Zoom" on page 188 Half height, full width Bottom

The data in both windows is identical, but the bottom window typically shows fewer

data points, spread across the whole display, which lets you see the data in those

192 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series User Manual

Other manuals for Keysight x-series