Basic Measurement Examples
R&S
®
FSVA/FSV
114
Quick Start Guide 1321.3066.02 ─ 06
7.3.3
Measuring AM-Modulated Signals
The signal analyzer rectifies the RF input signal and displays it as a magnitude
spectrum. The rectification also demodulates AM-modulated signals. The AF volt-
age can be displayed in zero span if the modulation sidebands fall within the res-
olution bandwidth.
Displaying the AF of an AM-modulated signal (Zero Span)
Test setup
Table 7-4: Signal generator settings (e.g. R&S SMU)
Frequency
128 MHz
Level
-30 dBm
Modulation
50 % AM, 1 kHz AF
1. Set the signal analyzer to the default state by pressing the PRESET key.
The R&S
FSVA/FSV is set to its default state.
2. Set the center frequency to 128 MHz and the span to 0 Hz.
a) Press the FREQ key and enter
128 MHz
.
b) Press the SPAN key and enter
0 Hz
or press the "Zero Span" softkey.
3. Set the sweep time to 2.5 ms.
a) Press the SWEEP key.
b) Press the "Sweeptime Manual" softkey.
c) Enter
2.5 ms
.
4. Set the reference level to +6 dBm and the display range to linear.
a) Press the AMPT key and enter
6 dBm
.
b) Press the "Range" softkey.
c) Press the "Range Linear %" softkey.
5. Set triggering in response to the AF signal by using the video trigger to pro-
duce a static image.
a) Press the TRIG key.
b) Press the "Trg/Gate Source" softkey and select "Video" using the arrow
keys.
Measuring Signal Spectra with Multiple Signals
