Analog Demodulation
R&S
®
FPC
150
User Manual 1178.4130.02 ─ 07
The SINAD measures the ratio of the total power to the power of noise and har-
monic distortions. The noise and harmonic power is calculated inside the AF spec-
trum span. The DC offset is removed before the calculation.
●
THD
Shows the total harmonic distortion.
The THD is the ratio of the harmonics to the fundamental and harmonics. All har-
monics inside AF spectrum are considered up to the tenth harmonic.
16.2
Frequency Configuration
Access
: "Freq"
Access
: "Setup" > "Config Overview" > "Frequency" (selected settings)
Remote commands to configure the frequency:
●
The R&S
FPC can demodulate a signal only if the frequency of the carrier signal is
known. Therefore, you have to define the frequency of the carrier signal, before any
useful information about the signal is shown in the application.
The width of the captured signal (the "span") is defined by the
.
If you do not know the frequency of the carrier signal, you have to find it out. You can
do that, for example, by searching the frequency spectrum in the spectrum application
in the area where you assume that the carrier is located.
Frequency settings in the analog modulation application described elsewhere:
●
"Center Frequency":
●
"Frequency Step Size":
"Defining a frequency step size"
16.3
Amplitude Configuration
Access
: "Ampt"
Access
: "Setup" > "Config Overview" > "Amplitude" (selected settings)
Remote commands to configure the amplitude:
●
Amplitude settings in the analog modulation application described elsewhere:
●
"Reference Level":
Chapter 14.4.1, "Reference Level"
●
"Preamplifier":
●
"Attenuator":
●
"Impedance":
"Selecting the input impedance"
When you select the graphical result display, you can also adjust the scale of the y-
axis.
Amplitude Configuration
