Rohde & Schwarz RTM20 Series, Руководство пользователя, Страница: 126 / 499

FFT
R&S
®
RTM20xx
111 User Manual 1317.4726.02 ─ 01
Move the focus between the Y(t)-window (Time Control), the FFT time base extract (Time
Section) and the FFT frequency range (FFT Control) by pressing the horizontal SCALE
rotary knob. The currently selected screen element is highlighted and displayed in the
information bar. Depending on the selection, the functions of the SCALE and
POSITION rotary knobs may change.
The usual channel parameters are displayed in the information bar above the Y(t)-window
(see the general display information described in the "Getting Started" manual).
In addition, FFT-specific parameters are indicated in the information bar above the FFT
window. The following information is given there:
Description Setting
1 Width of the time base extract for which FFT is calculated YT-Window
2 Position of time base extract Position
3 Width of the displayed frequency range Span
4 Center of the displayed frequency range Center
5 Sample rate for FFT calculation
6 FFT result mode Waveform Arithmetic
7 Signal source and vertical scaling factor per division CH1...CH4 / Y-Scale / Y-Scaling
8 Focus of the horizontal SCALE knob Press SCALE
When you deactivate the FFT display, the previous display is restored.
8.2 Configuring and Using FFT Calculations
● Setting Up the FFT Analysis .................................................................................111
● Configuring the Diagrams .....................................................................................112
● Measuring on FFT .................................................................................................115
8.2.1 Setting Up the FFT Analysis
To display an FFT diagram
► Press the FFT key.
The key lights up and two windows are displayed: the signal vs. time at the top, the
result of the FFT analysis at the bottom.
Configuring and Using FFT Calculations