Applications
R&S
®
RTA4000
175
User Manual 1335.7898.02 ─ 08
Vertical position and size of the FFT waveform
To set the position and the vertical scaling, select the FFT window and use the vertical
[Scale] and [Offset/Position] knobs.
Remote commands:
●
●
Zoom
You can use the vertical zoom ("Zoom" icon on the toolbar) on the FFT waveform. If
you draw the zoom area in the FFT diagram, center, span and vertical scale are adjus-
ted, and the zoomed section of the FFT is displayed in the FFT diagram.
9.2.2
Performing FFT analysis
1. Press the [FFT] key to start FFT analysis.
2. Press the [FFT] key again to open the FFT menu.
3. Select the "FFT Window" type according to the signal characteristics that are most
relevant for your measurement task (see
4. In the "Waveform" menu, select the waveform types you want to display (see
5. If you want to adjust the resolution bandwidth manually, disable "Automatic RBW".
6. On top of the FFT window, define the frequency range to be displayed in the spec-
trum window. You can set the start and stop frequencies, or the center frequency
and span, where the range is defined as (Center - Span/2) to ( Span/2).
For details, see
and
7. To start and stop FFT analysis, press the [Run Stop] key.
If "Automatic RBW" is disabled, you can also set the time gate by changing its width
"W" and position "P", or by changing the resolution bandwidth "RBW".
9.2.3
FFT setup
You can set the parameters for the FFT analysis in the spectrum window and in the
FFT menu. In addition, the short menu provides frequently used settings.
9.2.3.1
Short menu for FFT
Frequently used settings are available in the short menu. You can select the waveform
type, set full span, open the comprehensive menu and disable the FFT analysis.
FFT analysis