User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
463User Manual 1178.3370.02 ─ 03
Table 7-22: Overview of available trace modes
Trace Mode Description
Blank Hides the selected trace.
Clear Write Overwrite mode: the trace is overwritten by each sweep. This is the default setting.
All available detectors can be selected.
Max Hold The maximum value is determined over several measurements and displayed. The
R&S FPL1000 saves the sweep result in the trace memory only if the new value is
greater than the previous one.
This mode is especially useful with modulated or pulsed signals. The signal spectrum
is filled up upon each sweep until all signal components are detected in a kind of
envelope.
This mode is not available for statistics measurements.
Min Hold The minimum value is determined from several measurements and displayed. The
R&S FPL1000 saves the sweep result in the trace memory only if the new value is
lower than the previous one.
This mode is useful for example for making an unmodulated carrier in a composite
signal visible. Noise, interference signals or modulated signals are suppressed,
whereas a CW signal is recognized by its constant level.
This mode is not available for statistics measurements.
Average The average is formed over several measurements and displayed.
The Sweep/Average Count determines the number of averaging procedures.
This mode is not available for statistics measurements.
View The current contents of the trace memory are frozen and displayed.
If a trace is frozen ( "View" mode), the measurement settings, apart from scaling set-
tings, can be changed without impact on the displayed trace. The fact that the dis-
played trace no longer matches the current measurement settings is indicated by a yel-
low asterisk
on the tab label.
If you change any parameters that affect the scaling of the diagram axes, the
R&S FPL1000 automatically adapts the trace data to the changed display range. This
allows you to zoom into the diagram after the measurement to show details of the
trace.
How Many Traces are Averaged - Sweep Count + Sweep Mode
In "Average" trace mode, the sweep count and sweep mode determine how many
traces are averaged. The more traces are averaged, the smoother the trace is likely to
become.
The algorithm for averaging traces depends on the sweep mode and sweep count.
●
sweep count = 0 (default)
– In "Continuous" sweep mode, a continuous average is calculated for 10
sweeps, according to the following formula:
Trace Configuration