Basic Measurement Examples
R&S
®
FSVA/FSV
125
Quick Start Guide 1321.3066.02 ─ 06
i) Using the rotary knob, set the reference level such that the filter edge at
the center frequency intersects the -10 dB level line.
The filter edge of the 300 kHz filter is displayed. This corresponds to the
demodulator characteristic for FM signals with a steepness of approx. 18
dB/140 kHz. This can be verified using the marker and delta marker.
Figure 7-13: Display of the filter edge of the 300 kHz filter as an FM discriminator
characteristic
5. Set the FM deviation to 50 kHz on the signal generator.
6. Set the span to 0 Hz on the R&S
FSVA/FSV.
a) Press the SPAN key.
b) Press the "Zero Span" softkey.
The demodulated FM signal is displayed. The signal crosses the screen
continuously.
7. Establish a stable display using video triggering.
a) Press the TRIG key.
b) Press the "Trg/Gate Source" softkey and select "Video" using the arrow
keys.
Measurements in Zero Span
