The Spectrum Application (RF Measurements)
R&S
®
FPL1000
147
User Manual 1178.3370.02 ─ 09
2. Set the center frequency to
1
GHz
and the span to
1 MHz
.
3. To obtain maximum sensitivity, set RF attenuation to
0 dB
and the reference level
to
-40
dBm
.
4. Select the "Channel Power ACLR" measurement function from the "Select Mea-
surement" dialog box.
5. In the "ACLR Setup" dialog box, set up a single Tx channel with the channel band-
width
1.23
MHz
.
6. Select the "Adjust Settings" softkey.
The settings for the frequency span, the bandwidth (RBW and VBW) and the
detector are automatically set to the optimum values required for the measure-
ment.
7. Stabilize the measurement result by increasing the "Sweep Time".
Set the "Sweep Time" to
1
s
.
The trace becomes much smoother because of the RMS detector and the channel
power measurement display is much more stable.
Figure 7-24: Measurement of the R&S
FPL1000's intrinsic noise power in a 1.23 MHz channel
bandwidth.
7.2.4.7
Optimizing and Troubleshooting the Measurement
If the results do not meet your expectations, or if you want to minimize the measure-
ment duration, try the following methods to optimize the measurement:
●
Only activate as many
adjacent channels
as necessary to minimize the required
span and thus the required measurement time for the measurement.
Measurements and Results
