FFT
R&S
®
RTM20xx
110User Manual 1317.4726.02 ─ 01
8 FFT
In addition to signal vs. time and signal vs. signal displays, the frequencies of a signal as
determined by FFT analysis can be displayed. FFT analysis is configured and activated
using the FFT key. Analysis is always performed on the signal channel that was most
recently activated, however you can change the channel source.
Various parameters concerning the time base, scaling and the waveform arithmetic can
be configured for the FFT display. You can configure FFT either numerically using the
softkeys, or graphically using the rotary knobs.
On the FFT display, you can perform frequency and level measurements by means of a
cursor measurement. Automatic measurements are not available.
8.1 FFT Display
When you activate FFT display, two windows are displayed: the signal vs. time at the top,
the result of the FFT analysis at the bottom.
The display can be restricted to the results for a certain time base extract and to a speci-
fied frequency range. The time range is indicated by white lines in the Y(t)-diagram (see
also figure 8-1).
FFT Display
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