User Manual

Spectrum Analysis
R&S
®
Scope Rider RTH
103User Manual 1326.1578.02 ─ 08
5 Spectrum Analysis
The R&S RTH provides several forms of spectrum analysis:
●
Basic FFT calculation, which is included in the firmware
●
Spectrum analysis option R&S RTH-K18, which is hardware-supported and pro-
vides a wide range of analysis possibilities, for example,
●
Harmonics measurement option R&S RTH-K34, which provides an overview and
characteristic details on the harmonics contained in the measured signal
● FFT Mode..............................................................................................................103
● Spectrum Mode (Option R&S RTH-K18).............................................................. 108
● Harmonics Measurement (Option R&S RTH-K34)................................................125
5.1 FFT Mode
The new FFT mode is included in the standard R&S RTH installation and allows you to
perform FFT analysis directly on the instrument. During FFT analysis, the captured sig-
nal in the time domain is converted to a spectrum of frequencies. As a result, the mag-
nitude of the determined frequencies can be displayed.
5.1.1 Accessing the FFT Mode
1. Press the MODE key.
2. Select "FFT".
A power vs. frequency (spectrum) diagram is displayed, and the spectrum of the
currently captured data is analyzed, if available.
5.1.2 Display and Control
The FFT display shows a power vs. frequency (spectrum) diagram and relevant analy-
sis parameters. FFT results are useful to obtain an overview of the input signal in the
frequency domain and to detect unusual signal effects (such as spurs or distortions)
visually.
FFT Mode