The Spectrum Application
R&S
®
FPC
110User Manual 1178.4130.02 ─ 07
14.6.1 Sweep Time
The sweep time (or measurement time) is the time that the analyzer requires to acquire
and analyze the data in the selected frequency span. Large spans require more time to
measure than small spans. Generally, the R&S FPC requires at least 20 ms for every
600 MHz of span.
In addition to the frequency span, the measurement time also depends on the selected
resolution bandwidth: smaller resolution bandwidths require more time to settle than
large ones. If the measurement time is too short, the resolution filter has no time to set-
tle. In that case, the displayed levels will be too low.
In its default state, the R&S FPC automatically selects a measurement time that makes
sure that the measurement results for the selected span and resolution bandwidth are
correct and valid. If you change span or resolution bandwidth, the R&S FPC adjusts
the measurement time accordingly.
In the time domain (span = 0), the R&S FPC shows the video voltage over time. The
horizontal axis becomes a time axis that starts at 0 s and ends at the measurement
time that you have selected.
Defining the sweep time
1. Press the "Sweep" key to open the sweep menu.
2. Select one of the "Sweeptime: <x>" menu items.
● "Sweeptime: Manual"
Opens an input field to define the measurement time.
A manually selected measurement time is indicated by a blue dot in front of the
"SWT" label in the status bar.
Figure 14-13: Indicator of a manual sweep time
If you define a sweep time that is lower than the automatic sweep time, the dot
in front of the "SWT" label and the sweep time display turn red.
Figure 14-14: Indicator of a low sweep time
● "Sweeptime: Auto"
Automatically selects an appropriate measurement time depending on the cur-
rent frequency span and resolution bandwidth.
Tip: When you press the "Sweep" key, the R&S FPC automatically opens an input
field to define the sweep time. If the input field is inactive, you can open it with the
"Sweeptime: Manual" menu item.
14.6.2 Sweep Mode
The sweep mode defines how often the analyzer measures the frequency spectrum.
Sweep Configuration
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