User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
276User Manual 1178.3370.02 ─ 03
Figure 7-21: Measurement of the R&S FPL1000's intrinsic noise power in a 1.23 MHz channel
bandwidth.
7.2.3.7 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.
●
Increase the RBW to minimize the measurement time; however, consider the
requirements of the standard if you need to measure according to standard! The
automatic settings are always according to standard.
●
Take advantage of the speed optimization mode in the "Sweep" settings if you do
not require the larger dynamic range (see " Optimization " on page 400).
●
Reduce the "Sweep Time" and thus the amount of data to be captured and calcu-
lated; however, consider the requirements regarding the standard deviation.
●
To improve the stability of the measured results, increase the "Sweep Time" ,
which also leads to more averaging steps.
●
Instead of trace averaging, use an RMS detector with a higher "Sweep Time" to
obtain better average power results in less time.
●
To determine a channel power level quickly, use the Time Domain Power Mea-
surement (TDP) rather than a Channel Power measurement. The TDP measure-
ment is a zero span measurement where the sweep time determines the measure-
ment time. Due to the FFT measurement, duplicate averaging is performed, provid-
ing very stable results very quickly.
Note, however, that for TDP measurements, channel filters are not available and a
fixed RBW is used. Thus, the measurement may not be according to standard for
some test cases.
Measurements and Results