User Manual

Spectrum Analysis
R&S
®
Scope Rider RTH
108User Manual 1326.1578.02 ─ 08
Channel Bandwidth
Determines the frequency limit of the spectrum. Frequencies above the selected limit
are removed to reduce noise at different levels. Values from 1 kHz to 10 MHz can be
selected. Alternatively, the full span of the current input signal can be selected.
For more details on the channel bandwidth, see "Bandwidth" on page 39.
Remote command:
CHANnel<m>:BANDwidth on page 254
X-Scaling
Defines the scaling method for the frequency (x-)axis of the spectrum display.
"Linear"
Linear scaling
"Logarithmic"
Logarithmic scaling
Note that in this mode, not all possible amplitude values for a specific
frequency may occur. Each result is indicated by a bright, colored
trace point.
The DC amplitude (at 0 Hz) is not displayed, as lg(0) is not defined.
Remote command:
SPECtrum:FREQuency:HORizontal:SCALe on page 305
Sample Frequency
Indicates the sample rate with which FFT analysis is performed. This value may differ
from the Sampling Rate C1 - C4 in the data acquisition settings, as the number of sam-
ples must be adjusted to a value of 2
x
FFT points.
Remote command:
SPECtrum:FREQuency:SAMPle? on page 306
5.2 Spectrum Mode (Option R&S RTH-K18)
The optional Spectrum mode allows you to perform sophisticated spectrum analysis
directly on the instrument. During spectrum analysis, the captured signal in the time
domain is converted to a spectrum of frequencies. As a result, various signal charac-
teristics in the frequency domain can be displayed.
● Accessing the Spectrum Mode............................................................................. 109
● Display and Control...............................................................................................109
● Performing Spectrum Analysis..............................................................................111
● Spectrum Mode Settings.......................................................................................112
● Vertical Settings.................................................................................................... 116
● Marker (Peak Search) Settings.............................................................................117
● Cursor Measurements on Spectrums................................................................... 120
● Spectrum File Functions....................................................................................... 123
● Spectrum Results Export File Format................................................................... 124
Spectrum Mode (Option R&S RTH-K18)