Optimizing and Troubleshooting
R&S
®
FSW
1104
User Manual 1173.9411.02 ─ 19
C:\R_S\instr\ScpiLogging\ScpiLog.txt
Logging the commands may be extremely useful for debug purposes, e.g. in order to
find misspelled keywords in control programs. However, remember to turn off the log-
ging function after debugging to avoid unnecessary access to the hard drive and use of
storage space.
13.4 Minimizing the Measurement Duration
If you want to minimize the measurement duration, try the following methods to opti-
mize the measurement:
●
Reduce the
span
of the measurement to the relevant parts of the signal only.
●
Increase the
RBW
to minimize the measurement time; however, consider the
requirements of the standard if you need to measure according to standard!
●
Take advantage of the
speed optimization mode
in the "Sweep" settings if you do
not require the larger dynamic range (see
●
Reduce the
sweep time
and thus the amount of data to be captured and calcula-
ted; however, consider the requirements regarding the standard deviation.
●
To determine average (or peak) values, use an
RMS detector (or peak detector)
with a higher sweep time
instead of trace averaging to obtain better average
power results in less time. Furthermore, enforce the use of the
sweep type "FFT"
(as opposed to "Auto"; in Sweep mode, the averaging effect of the RMS detector
may be less efficient).
●
When performing multiple measurements, use
multiple measurement channels
to switch between measurements rather than changing the settings within one
channel repeatedly.
Take advantage of the
Sequencer
function to switch between multiple measure-
ments automatically or continuously (see also
chapter 4.5, "Running a Sequence of
13.5 Improving Averaging Results
Instead of
trace averaging
, use an RMS detector with a higher sweep time to obtain
better average power results in less time. Furthermore, enforce the use of the
sweep
type "FFT"
(as opposed to "Auto"; in Sweep mode, the averaging effect of the RMS
detector may be less efficient).
In FFT mode, FFTs are calculated per bin and combined using the RMS detector. For
trace averaging, on the other hand, the local oscillator must be switched repeatedly for
each trace, which takes additional time.
Generally, a higher
sweep time
leads to more data to be averaged and thus stabilizes
the results. In FFT mode, a higher sweep time means more FFTs are calculated and
combined per bin.
Minimizing the Measurement Duration
