User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
147User 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