The Spectrum Application (RF Measurements)
R&S
®
FPL1000
242
User Manual 1178.3370.02 ─ 03
3. Set the frequency span to
300
kHz
.
4. Set the resolution bandwidth to
30
kHz
and the video bandwidth to
1
kHz
.
Note:
Larger video bandwidths. The video bandwidth is set to 1
kHz in order to
make the level drop in the center of the two signals clearly visible. At larger video
bandwidths, the video voltage that results from envelope detection is not suffi-
ciently suppressed. This produces additional voltages, which are visible in the
trace, in the transition area between the two signals.
Figure 7-6: Measurement of two equally-leveled RF sinusoidal signals with the resolution band-
width which corresponds to the frequency spacing of the signals
Matching generator and R&S
FPL1000 frequencies
The level drop is located exactly in the center of the display only if the generator
frequencies match the frequency display of the R&S
FPL1000 exactly. To achieve
exact matching, the frequencies of the generators and the R&S
FPL1000 must be
synchronized.
5. Set the resolution bandwidth to
100
kHz
.
It is no longer possible to clearly distinguish the two generator signals.
Measurements and Results
