Basic Measurement Examples
R&S
®
ESR
104
Getting Started 1316.3749.02 ─ 09
frequency). The resolution bandwidth and the frequency offset must be selected
in such a manner that the instantaneous frequency is located in the linear part of
the filter edge. As a result, the frequency variation of the FM-modulated signal is
transformed into an amplitude variation that can be displayed on screen in zero
span.
Displaying the AF of an FM-Modulated Carrier
Test setup
Table 7-8: Signal generator settings (e.g. R&S SMU)
Frequency
128 MHz
Level
-20 dBm
Modulation
FM 0 kHz deviation (i.e. FM modulation is
deactivated), 1 kHz AF
1. Set the signal analyzer to the default state by pressing the [PRESET] key.
The R&S
ESR is set to its default state.
2. Select "Spectrum" mode.
3. Set the center frequency to 127.50 MHz and the span to 300 kHz.
a) Press the [FREQ] key and enter
127.50 MHz
.
b) Press the [SPAN] key and enter
300 kHz
.
4. Set the resolution bandwidth to 300 kHz.
a) Press the [BW] key.
b) Press the "Res BW Manual" softkey and enter
300 kHz
.
c) Press the "Video BW Manual" softkey and enter
30 kHz
.
5. Set the display range to 20 dB and shift the filter trace to the center of the
screen.
a) Press the [AMPT] key.
b) Press the "Range" softkey
c) Press the "Range Log Manual" softkey and enter
20 dB
.
d) Press the "Up
↑
" softkey.
e) Press the "More" softkey.
f) Switch the "Grid" softkey to "Rel".
g) Press the "Up
↑
" softkey.
Measurements in Zero Span