R&S FPC Series User Manual

Analog Demodulation
R&S
®
FPC
150User 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:
●
Chapter 19.14.2, "Frequency", on page 308
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 demodulation band-
width.
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": "Defining a center frequency" on page 94
●
"Frequency Step Size": "Defining a frequency step size" on page 94
16.3 Amplitude Configuration
Access: "Ampt"
Access: "Setup" > "Config Overview" > "Amplitude" (selected settings)
Remote commands to configure the amplitude:
●
Chapter 19.12.3, "Amplitude", on page 252
Amplitude settings in the analog modulation application described elsewhere:
●
"Reference Level": Chapter 14.4.1, "Reference Level", on page 99
●
"Preamplifier": "Preamplifier" on page 103
●
"Attenuator": "RF attenuator" on page 101
●
"Impedance": "Selecting the input impedance" on page 98
When you select the graphical result display, you can also adjust the scale of the y-
axis.
Amplitude Configuration

R&S FPC Series Specifications

General

Brand	R&S
Model	FPC Series
Category	Measuring Instruments
Language	English