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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
390
User Manual 1178.3370.02 ─ 09
Trace Mode
Description
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.
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:
10
*
9
MeasValue
Trace
Trace
old
Figure 7-52: Equation 1
Due to the weighting between the current trace and the average trace, past val-
ues have practically no influence on the displayed trace after about ten
sweeps. With this setting, signal noise is effectively reduced without need for
restarting the averaging process after a change of the signal.
–
In
"Single"
sweep mode, the current trace is averaged with the previously
stored averaged trace. No averaging is carried out for the first sweep but the
measured value is stored in the trace memory. The next time a sweep is per-
formed, the trace average is calculated according to the following formula:
Trace Configuration