Basic Measurement Examples
R&S
®
FSVA/FSV
126
Quick Start Guide 1321.3066.02 ─ 06
c) Press the "Trg/Gate Level" softkey and enter
50%
.
A static image for the FM AF signal is produced.
Result: (-10 ( 5) dB; this yields a deviation of 100 kHz when the steepness
of the demodulator characteristic is 5 dB/100 kHz.
Figure 7-14: Demodulated FM signal
8. Determine the deviation.
a) Press the MKR key.
Marker 1 is activated and placed on the peak of the curve.
b) Press the "Marker 2" softkey.
c) Press the MKR key.
d) Press the "More" softkey.
e) Press the "Min" softkey.
Marker 2 (delta marker) is placed on the minimum of the curve. The level
difference is 13.3 dB, which corresponds to the peak-to-peak deviation.
With the filter slope of 18 dB/140 kHz, the deviation can be calculated as
follows:
Measurements in Zero Span
